We calculated the final lepton/b-quark energy/angular distributions in e^+ e^- to t tbar to l/bX at polarized NLC in order to study whether there are any anomalous top-quark couplings originating in new physics. We assumed the most general form factors for t tbar/gamma,Z,W vertices to perform analysis as model-independent way as possible. We applied optimal-observable procedure to the results and examined how precisely anomalous parameters can be determined.
Authors:Bohdan Grzadkowski and Zenro Hioki
Proposed speaker: Zenro Hioki
Contact person:Zenro Hioki
(University of Tokushima),
hioki@ias.tokushima-u.ac.jp
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: hep-ph/9911505
Notes:Another paper is now being prepared (to appear in hep-ph).
We report on the observation of D* pi+ pi-pi- pio decays, both charged and neutral D*'s, using 9 fb-1 data obtained with the CLEO detector. The branching ratios are about 2%. In ~20% of these final states the neutral-three-pion system results from omega decay. The omega-pi- system appears to come from a resonance near 1420 MeV having a width of 380 MeV. A spin-0 assignment is ruled out. Final states of D omega pi have also been observed and the decay angular distributions studied.
Authors:CLEO collaboration
Proposed speaker: CLEO collaboration
Contact person:David E Jaffe
(Cornell University),
cleoac@mail.lns.cornell.edu
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
We analyze Upsilon(nS) (n=1,2,3) resonances at the Fermilab Tevatron by means of the PYTHIA event generator with the color-octet mechanism implemented in and considering higher order QCD effects. Once extracted and discussed those relevant NRQCD matrix elements from the fit to Tevatron data, we extrapolate up to $\sqrt{s}=14$ TeV to make predictions on the expected rates and the physical potential of bottomonia production at the LHC.
Authors:J.L. Domenech and M.A. Sanchis
Proposed speaker: M.A. Sanchis
Contact person:Miguel Angel Sanchis
(University of Valencia),
mas@evalo1.ific.uv.es
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) /
Supporting papers: Phys. Lett. B 476 (2000) 65 (hep-ph/9911332) hep-ph/0003142 Nucl. Phys. B 508 (1997) 753
Notes:
The BTeV program at the Tevatron is proposed to do a complete study of CP violation, mixing and rare decays in the b and c systems. The physics reach for CP violation and mixing has been determined using simulation tools including GEANT. Efficiencies and backgrounds in modes such as Bo->pi+ pi-, Bo->rho pi, Bs->Ds+K- and Bs->Ds+pi- will be reported. The resulting errors in the CP violating angles alpha, beta and gamma and the reach in the Bs mixing parameter x_s will be given.
Authors:BTeV Collaboration
Proposed speaker: Joel Butler
Contact person:Sheldon Stone
(Syracuse University),
stone@phy.syr.edu
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
The magnitude of the CKM matrix element Vcb is measured using B --> D* l nu decays recorded on the Z0 peak using the OPAL detector at LEP. The D* --> D0 pi+ decays were reconstructed both in the particular decay modes D0 --> K-pi+ and D0 --> K-pi+pi0 and via an inclusive technique. The product of |Vcb| and the decay form factor of the B --> D* l nu transition at zero recoil F(1) was measured to be F(1)|Vcb| =(37.1 +/- 1.0 (stat.) +/- 2.0 (syst.)) x 10^-3. By using HQET calculations for F(1), we obtain Vcb =(37.1 +/- 1.0 (stat.) +/- 2.0 (syst.) +/- 2.0 (theory)) x 10^-3.
Authors:The OPAL collaboration
Proposed speaker:
Contact person:David J Miller
(CERN),
dave.miller@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: CERN-EP-2000-032 = OPAL PR305, submitted to Phys. Lett. B = http://opal.web.cern.ch/Opal/pubs/paper/html/pr305.html
Notes:
The inclusive charm hadron semileptonic branching fractions B(c --> e) and B(c --> mu) in Z0 --> cc events have been determined using 4.4 million hadronic Z0 decays collected with the OPAL detector at LEP. A charm-enriched sample is obtained by selecting events with reconstructed D* mesons. Using leptons found in the hemisphere opposite that of the D* mesons, the semileptonic branching fractions of charm hadrons are measured to be B(c --> e ) = 0.103 +/- 0.009 +0.009 -0.008 B(c --> mu ) = 0.090 +/- 0.007 +0.007 -0.006 where the first errors are in each case statisical and the second systematic. Combining these measurements, the inclusive semileptonic branching fraction of charm hadrons is determined to be B(c --> l) = 0.095 +/- 0.006 (stat.) +0.007 - 0.007 (syst.).
Authors:The OPAL collaboration
Proposed speaker:
Contact person:David J Miller
(CERN),
dave.miller@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: CERN-EP/98-146 = OPAL PR259, Eur. Phys. J. C8 (1999) 23-40 = http://opal.web.cern.ch/Opal/pubs/paper/html/pr259.html
Notes:
The product branching ratio, f(b->Lambdab).BR(Lambdab->LambdaX) , where /\b denotes any weakly-decaying b baryon, has been measured using the OPAL detector at LEP. /\b's are selected by the presence of energetic /\ particles in bottom events tagged by the presence of displaced secondary vertices. A fit to the momenta of the /\ particles separates signal from b meson and fragmentation backgrounds. Combined with a previous OPAL measurement, one obtains f(b->Lambdab).BR(Lambdab->LambdaX) = (3.50 +/- 0.32 (stat.) +/- 0.35 (syst.))%
Authors:The OPAL collaboration
Proposed speaker:
Contact person:David J Miller
(CERN),
dave.miller@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: CERN-EP/98-186 = OPAL PR265, Eur. Phys. J. C9 (1999) 1-9 = http://opal.web.cern.ch/Opal/pubs/paper/html/pr265.html
Notes:
The lifetimes of the B+ and B0 mesons, and their ratio, have been measured in the OPAL experiment using Z->bb events with well-reconstructed charged and neutral secondary vertices. The results are: tau_B+ = 1.643 +- 0.037 +- 0.025 ps, tau_B0 = 1.523 +- 0.057 +- 0.053 ps, tau_B+/tau_B0 = 1.079 +- 0.064 +- 0.041. CP and CPT violating effects have been searched for by comparison of inclusive b and bbar hadron decays. The CP violation parameter Re(epsilon_B) is measured to be 0.001 +-0.014 +-0.003 and the fractional difference between b and bbar hadron lifetimes is measured to be -0.001+-0.012+-0.008.
Authors:The OPAL collaboration
Proposed speaker:
Contact person:David J Miller
(CERN),
dave.miller@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: CERN-EP/98-195 = OPAL PR266, Eur. Phys. J. C12 (2000) 609-626 = http://opal.web.cern.ch/Opal/pubs/paper/html/pr266.html
Notes:
Measurements of the semileptonic branching fractions of inclusive b hadrons, BR(b --> l) and BR(b --> c --> l), are obtained using 3.6 million multihadronic Z0 decays collected with the OPAL detector. An enriched Z0 to bb sample is obtained with a lifetime flavour-tagging technique. Selected leptons from this sample are then classified according to their origin, which is determined by comparing the distribution of several kinematic variables using artificial neural networks. Combining the results for electrons and muons, the BR(b --> l) result is the most precise measurement to date at the Z0 resonance. Agreement between data and various semileptonic decay lepton spectra and fragmentation functions is also investigated.
Authors:The OPAL collaboration
Proposed speaker:
Contact person:David J Miller
(CERN),
dave.miller@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: CERN-EP/99-078 = OPAL PR279, Eur. Phys. J. C13 (2000) 225-240 = http://opal.web.cern.ch/Opal/pubs/paper/html/pr279.html
Notes:
A sample of Z0 decays containing b-flavoured hadrons is tagged using leptons, and events having precise proper time measurements are selected. These events are used to study Bs0 oscillations. The flavour (b or bbar) at decay is determined from the lepton charge while the flavour at production is determined from jet charge or the charge of a second lepton, where available. The experiment was not able to resolve the oscillatory behaviour, and we deduce that the Bs0 oscillation frequency delta m_s > 5.2 ps^-1 at the 95% confidence level.
Authors:The OPAL collaboration
Proposed speaker:
Contact person:David J Miller
(CERN),
dave.miller@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: CERN-EP/99-085 = OPAL PR282, Eur. Phys. J. C11 (1999) 587-598 = http://opal.web.cern.ch/Opal/pubs/paper/html/pr282.html
Notes:
The rate of secondary charm-quark pair production has been measured in 4.4 million hadronic Z0 decays collected by OPAL. By selecting events with three jets and tagging charmed hadrons in the gluon jet candidate using leptons and D* mesons, the average number of secondary charm-quark pairs per hadronic event is found to be (3.20+/-0.21+/-0.38) x 10^-2.
Authors:The OPAL collaboration
Proposed speaker:
Contact person:David J Miller
(CERN),
dave.miller@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: CERN-EP/99-089 = OPAL PR284, Eur. Phys. J. C13 (2000) 1-13 = http://opal.web.cern.ch/Opal/pubs/paper/html/pr284.html
Notes:Also Parallel Session 3, Perturbative QCD
Charm production in DIS provides an important opportunity to study the theory of heavy quark production in PQCD. In a consistent formulation of QCD, valid for the full range of Q from m_c to high energies, available data can reveal important information on the charm and gluon structure of the nucleon. We describe how this can be carried out in the generalized \msbar\ formalism of Collins (also known as the ACOT approach), and demonstrate the inherent smooth transition from the 3-flavor to the 4-flavor scheme description in a complete order $\alpha_s$ calculation. This calculation is accurate to the same order as the conventional NLO $F_2$ in the limit $\frac{Q}{m_c} >> 1$. It also includes the resummed large logarithm contributions of the 3 fixed-flavor-number (FFN) scheme to all orders of $\alpha_s\ln(m_c^2/Q^2)$. Comparison with recent HERA data and existing NLO FFN calculation reveals that the relatively simple order-$\alpha_s$ 4-flavor ($m_c \neq 0$) calculation can, in practice, be extended to rather low energy scales and yield good agreement with data over the full measured $Q^2$ range with some natural choice of the factorization scale. Our Monte Carlo implementation of this formalism also allows the calculation of differential distributions with relevant kinematic cuts.
Authors:J. Amundson, C. Schmidt, W.K. Tung, and X.N. Wang
Proposed speaker: Wu-Ki Tung
Contact person:Wu-Ki Tung
(Michigan State University),
Tung@pa.msu.edu
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: (to be submitted to LANL E-archive soon)
Notes:This topic could alternatively be presented in the "Hard Processes and QCD" Parallel and Planary sessions. The session chairs should decide.
The rate of gluons splitting to b-bbar quark pairs in hadronic Z0 decays and the rate of final states with two b-bbar quark pairs are measured using data collected by OPAL. Events containing four jets are selected where two of the jets that are close in phase-space contain secondary decay vertices. In addition four jet events are selected that have secondary decay vertices in at least three of the four jets. Information from the event topology is combined in a likelihood analysis to extract the values of the gluon splitting rates.
Authors:The OPAL collaboration
Proposed speaker:
Contact person:David J Miller
(CERN),
dave.miller@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: OPAL PN383 = http://opal.web.cern.ch/Opal/pubs/physnote/html/pn383.html
Notes:Also Parallel session 3, Perturbative QCD
The decays $B_d\to\pi^+\pi^-$ and $B_s\to K^+K^-$ provide an interesting strategy to extract the CKM angle $\gamma$ at ``second-generation'' $B$-physics experiments of the LHC era. A variant for ``first-generation'' experiments can be obtained, if $B_s\to K^+K^-$ is replaced by $B_d\to\pi^\mp K^\pm$. We show that the most recent experimental results for the CP-averaged $B_d\to\pi^+\pi^-$ and $B_d\to\pi^\mp K^\pm$ branching ratios imply a rather restricted range for the corresponding penguin parameters, and upper bounds on the direct CP asymmetries ${\cal A}_{\rm CP}^{\rm dir}(B_d\to\pi^+\pi^-)$ and ${\cal A}_{\rm CP}^{\rm dir}(B_d\to\pi^\mp K^\pm)$. Moreover, we point out that interesting constraints on $\gamma$ can be obtained from the CP-averaged $B_d\to\pi^+\pi^-$ and $B_d\to\pi^\mp K^\pm$ branching ratios, if in addition mixing-induced CP violation in the former decay is measured, and the $B^0_d$--$\overline{B^0_d}$ mixing phase is fixed through $B_d\to J/\psi K_{\rm S}$. An extraction of $\gamma$ becomes possible, if furthermore direct CP violation in $B_d\to\pi^+\pi^-$ or $B_d\to\pi^\mp K^\pm$ is observed.
Authors:Robert Fleischer
Proposed speaker: Robert Fleischer
Contact person:Robert Fleischer
(Deutsches Elektronen-Synchrotron),
Robert.Fleischer@desy.de
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: hep-ph/0001253
Notes:
As we pointed out recently, the neutral decays $B_d\to\pi^\mp K^\pm$ and $B_d\to\pi^0K$ may provide non-trivial bounds on the CKM angle $\gamma$. In this paper, we reconsider this approach in the light of recent CLEO data, which look very interesting. In particular, the results for the corresponding CP-averaged branching ratios are in favour of strong constraints on $\gamma$, where the second quadrant is preferred. Such a situation would be in conflict with the standard analysis of the unitarity triangle. Moreover, constraints on a CP-conserving strong phase $\delta_{\rm n}$ are in favour of a negative value of $\cos\delta_{\rm n}$, which would be in conflict with the factorization expectation. In addition, there seems to be an interesting discrepancy with the bounds that are implied by the charged $B\to\pi K$ system: whereas these decays favour a range for $\gamma$ that is similar to that of the neutral modes, they point towards a positive value of $\cos\delta_{\rm c}$, which would be in conflict with the expectation of equal signs for $\cos\delta_{\rm n}$ and $\cos\delta_{\rm c}$. If future data should confirm this ``puzzle'', it may be an indication for new-physics contributions to the electroweak penguin sector, or a manifestation of large non-factorizable $SU(3)$-breaking effects.
Authors:Andrzej J. Buras, Robert Fleischer
Proposed speaker: Robert Fleischer
Contact person:Robert Fleischer
(Deutsches Elektronen-Synchrotron),
Robert.Fleischer@desy.de
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: hep-ph/0003323
Notes:
We point out that the pure ``tree'' decays $B_c^\pm\to D^\pm_s D$ are particularly well suited to extract the CKM angle $\gamma$ through amplitude relations. In contrast to conceptually similar strategies using $B^\pm\to K^\pm D$ or $B_d\to K^{\ast0} D$ decays, the advantage of the $B_c$ approach is that the corresponding triangles have three sides of comparable length and do not involve small amplitudes. Decays of the type $B_c^\pm\to D^\pm D$ -- the $U$-spin counterparts of $B_c^\pm\to D^\pm_s D$ -- can be added to the analysis, as well as channels, where the $D^\pm_s$- and $D^\pm$-mesons are replaced by higher resonances.
Authors:Robert Fleischer, Daniel Wyler
Proposed speaker: Robert Fleischer
Contact person:Robert Fleischer
(Deutsches Elektronen-Synchrotron),
Robert.Fleischer@desy.de
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: hep-ph/0004010
Notes:
From an analysis of the ionisation energy loss of charged particles selected from a sample of 147926 tau pair candidates recorded in the OPAL detector at centre-of-mass energies near the Z0 resonance, we determine the branching ratios: Br(tau -> K-pi0pi+(>=0pi0)) = 0.343 (0.073) (0.031) Br(tau -> K-pi0K+(>=0pi0)) = 0.159 (0.053) (0.020) The tau -> K-pi-pi+(>=pi0) final states occurring through tau -> K-K0s(>=0pi0) are treated as background in this analysis. We also examine the resonant structure of \tkpp\ candidates. Under the assumption that the resonant structure is dominated by the K$_1$ resonances, we determine that the ratio of the Br(tau -> K1(1270)) to the Br(tau->K1(1270))+Br(tau->K1(1400)) is 0.71(0.16)(0.11). In all results, the first uncertainties are statistical and the second are systematic.
Authors:The OPAL collaboration
Proposed speaker:
Contact person:David J Miller
(CERN),
dave.miller@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: CERN-EP/99-095, Eur. Phys. J. C13 (2000) 197-212 =http://opal.web.cern.ch/Opal/pubs/paper/html/pr288.html
Notes:
The branching ratio of the tau lepton to a neutral kaon meson is measured from a sample of approximately 200,000 tau decays recorded by the OPAL detector at centre-of-mass energies near the Z0 resonance. The measurement is based on two samples which identify one-prong tau decays with K(long) and K(short) mesons. The combined branching ratios are measured to be Br(tau -> pi- K0) = (9.33 +/- 0.68 +/- 0.49}) x 10^{-3} Br(tau -> pi- K0 (>=1pi0)) = (3.24 +/- 0.74 +/- 0.66}) x 10^{-3}} Br(tau -> K- K0 (>=0pi0)) = (3.30 +/- 0.55 +/-m0.39}) x 10^{-3} where the first error is statistical and the second systematic.
Authors:The OPAL collaboration
Proposed speaker:
Contact person:David J Miller
(CERN),
dave.miller@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: CERN-EP/99-154, Eur. Phys. J. C13 (2000) 213-223 =http://opal.web.cern.ch/Opal/pubs/paper/html/pr293.html
Notes:
Using four million hadronic Z decays recorded with the ALEPH detector at LEP1, the Bs->Ds(*)+ Ds(*)- decay is observed, tagging the final state with two phi mesons in the same hemisphere. This final state is mostly CP even and corresponds to the short-lived Bs mass eigenstate. The branching ratio of this decay is measured to be (23+-10+19-9)%. A measurement of the lifetime of the Bs(short) gives 1.27+-0.33+-0.10 ps. The lifetime and the branching ratio measurements allow two independent estimates to be made of Delta Gamma/Gamma in the Bs-Bs bar system, corresponding to an average value of (25+21-14)%.
Authors:ALEPH collaboration
Proposed speaker:
Contact person:Fabrizio Palla
(CERN),
Fabrizio.Palla@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: CERN EP/2000-036
Notes:
An improved search for B0s oscillations is performed in a sample of recently reprocessed semileptonic B hadron decays collected by the ALEPH experiment during 1991-1995. This analysis represents a major improvement upon our previous publication based on this method, which is still the world's best analysis to date. Improved vertexing and selection methods yield a sample increased by a factor 2.5 compared to our previous work, with better resolution. The other key elements of the analysis (charge tagging and enrichment in Bs candidates) are improved as well. This upgrade will have a major impact on the world combination.
Authors:ALEPH collaboration
Proposed speaker:
Contact person:Fabrizio Palla
(CERN),
Fabrizio.Palla@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
The purely leptonic decays Ds -> mu nu and Ds -> tau nu are studied in a sample of four million hadronic Z decays collected in 1991-1995 with the ALEPH detector at LEP. The tau nu channel is analyzed in the tau -> e nu nubar and mu nu nubar final states. The branching fraction measurements are used to extract the pseudoscalar decay constant f_Ds.
Authors:ALEPH collaboration
Proposed speaker:
Contact person:Fabrizio Palla
(CERN),
Fabrizio.Palla@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
The lifetimes of the B0d and B- mesons are measured in a sample of about four million hadronic Z decays collected from 1991 to 1995 with the ALEPH detector at LEP. The data sample has been recently reprocessed, achieving a substantial improvement in the tracking performance. Semileptonic decays of B0 and B- mesons are partially reconstructed in the channels (D*,l) and (D0,l). The proper time of the B meson is derived from the measured decay length and momentum. For the estimate of the momentum, the neutrino energy is measured from the missing energy of the event.
Authors:ALEPH collaboration
Proposed speaker:
Contact person:Fabrizio Palla
(CERN),
Fabrizio.Palla@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
In a sample of about 4 million Z decays recorded in the years 1991 to 1995, orbitally excited D_s mesons with L=1 (D_s1+ and D_s2*+) are reconstructed in the decay channels D_s1+ -> D*0,K+ , D_s1+ -> D*+,K0 and D*_s2 -> D0,K+. The production rates for XE>0.3 are determined for the inclusive as well as for c- and b-quark enriched samples.
Authors:ALEPH collaboration
Proposed speaker:
Contact person:Fabrizio Palla
(CERN),
Fabrizio.Palla@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
The production rates of charmed hadrons in Z to ccbar decays are measured using the LEP I data collected with the ALEPH detector. We have measured the probability for a c quark to hadronise into a D*+, their average beam energy fraction in Z to cc events and the fraction of hadronic Z decays in which a gluon splits to a cc pair. The ratio of the Vector/Pseudoscalar production rates in charmed mesons is measured.
Authors:ALEPH collaboration
Proposed speaker:
Contact person:Fabrizio Palla
(CERN),
Fabrizio.Palla@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: CERN EP 99-094
Notes:
The decay B0 -> J/psi K0_s is reconstructed with J/psi -> e+ e- or mu+ mu- and K0_s -> pi+ pi-. From the full ALEPH LEP 1 dataset of about 4 million hadronic Z decays, 23 candidates are selected with an estimated purity of 71%. They are used to measure the CP asymmetry of this decay, given by sin(2beta) in the Standard Model. The result is combined with other existing measurements, and the confidence level that CP violation has been observed in this channel is calculated.
Authors:ALEPH collaboration
Proposed speaker:
Contact person:Fabrizio Palla
(CERN),
Fabrizio.Palla@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
A search for CP violating effects in the mixing of neutral B mesons is performed using the full LEP 1 data set collected by the ALEPH detector, consisting of approximately 4 million hadronic Z decays. Two measurements of the CP violating asymmetry are extracted by studying time dependent asymmetries in flavour tagged samples of semileptonic B0d decays and fully inclusive b hadron decays. A combined value of the CP violating parameter Re(epsilon_B) is derived.
Authors:ALEPH collaboration
Proposed speaker:
Contact person:Fabrizio Palla
(CERN),
Fabrizio.Palla@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
A lower limit on the oscillation frequency of the B0s-B0sbar system is obtained from recently reprocessed events taken with the ALEPH detector from 1991 to 1995. Fifty B0s candidates, with a purity of about 40%, are fully reconstructed in the Ds-pi and Ds-a1 decay modes. In addition, leptons are combined with fully reconstructed Ds candidates as evidence for B0s decays leading to 297 events. The initial state of the B0s candidates has been determined using a neural network algorithm. The 95% CL limit on the oscillation frequency is 5.4 ps-1 with an expected sensitivity of 7.4 ps-1.
Authors:ALEPH collaboration
Proposed speaker:
Contact person:Fabrizio Palla
(CERN),
Fabrizio.Palla@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
From the full LEP 1 statistics collected by the ALEPH detector, identified muons and electrons are used to measure the semileptonic branching ratios for primary and cascade b decays. A high purity b sample is selected with a hemisphere-based lifetime tag. The correlation between the lepton charge and an inclusive charge estimator defined in the opposite hemisphere is exploited to reduce the dependence on the b-decay modelling.
Authors:ALEPH collaboration
Proposed speaker:
Contact person:Fabrizio Palla
(CERN),
Fabrizio.Palla@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
Status of the theoretical B -> X_s gamma and B -> X_s l^+ l^- analyses is reviewed. Recently completed perturbative calculations are briefly described. The level at which nonperturbative effects are controlled is discussed.
Authors:C. Bobeth, M.Misiak, J.Urban
Proposed speaker: M. Misiak
Contact person:Mikolaj K Misiak
(CERN),
Mikolaj.Misiak@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: C. Bobeth, M.Misiak, J.Urban, hep-ph/9910220, to be published in Nucl. Phys. B M. Misiak, hep-ph/0002007
Notes:
We measure the mass of the tau lepton to be 1775.1 +/- 1.6(stat.) +/- 1.0(sys.) MeV using tau pairs from Z^0 decays. To test CPT invariance we compare the masses of the positively and negatively charged tau leptons. The relative mass difference is found to be smaller than 3.0 x 10^-3 at the 90% confidence level.
Authors:The OPAL collaboration
Proposed speaker:
Contact person:David J Miller
(CERN),
dave.miller@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: OPAL preprint PR308, submitted to Phys. Letts. B, and at http://opal.web.cern.ch/Opal/pubs/paper/html/pr308.html
Notes:Also of interest for Parallel session 11, New Phenomena and Plenary Session 7a, New Phenomena
The production rates of D^0, D^+, D^+_s and Lambda_c^+ in hadronic Z0 decays have been measured using the complete OPAL LEP1 dataset. Production in Z0 --> bb and Z0 -->cc decays is separated using the momentum and decay length of the charm hadrons. The results are used to determine R_c = Gamma_c bar c/Gamma_had and the charm hadron multiplicity in b hadron decays.
Authors:The OPAL collaboration
Proposed speaker:
Contact person:David J Miller
(CERN),
dave.miller@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: To be submitted to the conference and listed on http://opal.web.cern.ch/Opal/pubs/publications.html
Notes:
A sample of Bs0 decays is obtained using Ds-lepton+ combinations, where the Ds is fully reconstructed in the phi pi-, K*0 K- and K- Ks decay channels or partially reconstructed in the phi lepton- X decay mode. These events are used to study Bs0 oscillations. The flavour (b or b-bar) at decay is determined from the lepton charge while the flavour at production is determined from four indicators: the momentum weighted jet charges for the candidate jet and the opposite jet and, where available, the charges of a prompt lepton in the opposite hemisphere and of a fragmentation kaon.
Authors:The OPAL collaboration
Proposed speaker:
Contact person:David J Miller
(CERN),
dave.miller@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: To be submitted to the conference and listed on http://opal.web.cern.ch/Opal/pubs/publications.html
Notes:
We propose the decay modes $B \to \a_0 (\to \eta \pi) \pi$ to determine the CKM phase $\alpha$. One can analyze these modes through; (i) the $B \to a_0 \pi$ isospin pentagon, (ii) the time dependent Dalitz plot of $B^0(t) \to a_0^{\pm} \pi^{\pm} \to \eta \pi^+ \pi^-$, and (iii) the time dependence of $B^0(t) \to a_0^0 (\to \eta \pi^0) \pi^0$. We show that the $a_0 \pi$ modes have certain advantages as compared to the $\rho \pi$ modes, which are currently the most favored decay channels for the determination of $\alpha$.
Authors:C. S. Kim and Amol Dighe
Proposed speaker: C. S. Kim
Contact person:Choong Sun Kim
(University of Wisconsin),
cskim@pheno.physics.wisc.edu
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-02 CP Violation and Rare Decays ( Kaon, Muon )
Supporting papers: M. Gronau, D. London, Phys. Rev. Lett. 65 (1990) 3381. A. E. Snyder and H. R. Quinn, Phys. Rev. D48 (1993) 2139.
Notes:
The luminosity determination of electron-positron colliders operating in the energy region around the Y resonance such KEKB and PEP-II (B factories), requires the precision calculation of the Bhabha process at large scattering angles. To achieve a theoretical accuracy at a few 0.1\% level, the relevant effect of QED corrections is taken into account within the Parton Shower (PS) method. A benchmark calculation, including exact O(alpha) corrections and higher-order leading logarithmic contributions, is developed as well and compared in detail with the PS predictions. The effect of O(alpha) next-to-leading and higher-order leading corrections is investigated in the presence of realistic event selections for the Bhabha process at the B factories. A new Monte Carlo generator for data analysis (BABAYAGA) is presented, with an estimated accuracy of 0.5\%. Numerical results for two-photon and muon- pair production are also discussed.
Authors:C.M. Carloni Calame, G. Montagna, O. Nicrosini, F. Piccinini
Proposed speaker: Fulvio Piccinini
Contact person:Fulvio Piccinini
(Universita` di Pavia and INFN, Sezione di Pavia),
Fulvio.Piccinini@pv.infn.it
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: Authors: C.M. Carloni Calame, C. Lunardini, G. Montagna, O. Nicrosini, F. Piccinini Title: Large-angle Bhabha scattering and luminosity at flavour factories Archive number: hep-ph/0003268
Notes:
The experimental data from JINR, Dubna, on the cumulative particles generation in dA and CTa-collisions and the polarization transfer in polarized dA-collisions at the energies from 2.0 to 4.2 GeV/N are examined. The yields of cumulative and accompanying particles as well the polarization behaviour have shown that the nuclei can not be regarded as the pure composition of the nucleons. It would be reasonable to involve nuclear medium modification, caused by quark deconfinement in the nuclei, to explain these results.
Authors:V. Penev and Chklovskaia (Collaboration SPHERE - JINR)
Proposed speaker: V.Penev
Contact person:Alexandr Malakhov
(JINR),
malakhov@lhe.jinr.ru
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) /
Supporting papers:
Notes:
We propose the decay modes $B \to a_0 (\to \eta \pi) \pi$ to determine the CKM phase $\alpha$. One can analyze these modes through (i) the $B \to a_0 \pi$ isospin pentagon, (ii) the time dependent Dalitz plot of $B^0(t) \to a_0^\pm \pi^\pm \to \eta \pi^+ \pi^-$, and (iii) the time dependence of $B^0(t) \to a_0^0 (\to \eta \pi^0) \pi^0$. We show that the $a_0 \pi$ modes have certain advantages as compared to the $\rho \pi$ modes. which are currently the most favored decay channels for the determination of $\alpha$. We strongly recommend the time dependent Dalitz plot analysis in the $a_0 \pi$ channel.
Authors:C. S. Kim and Amol S. Dighe
Proposed speaker: C. S. Kim
Contact person:Choong Sun (C.S.) Kim
(Univ. of Wisconsin),
cskim@pheno.physics.wisc.edu
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: M. Gronau and D. London, Phys. Rev. Lett. 65 (1990) 3381. H. Lipkim, Y. Nir, H.R. Quinn and A. Snyder, Phys. Rev. D44 (1991) 1454.
Notes:
In the minimal supersymmetric standard model (MSSM), the $\mu-$parameter and the trilinear coupling $A_t$ may be generically complex and can affect various observables at B factories. Working in the effective SUSY models and imposing the edm constraints from Chang-Keung-Pilaftsis (CKP) mechanism, we find that (i) there is no new large phase shift in the $B^0 - \bar{B^0}$ mixing from the $A_t$ and $\mu$ phases, (ii) CP violating dilepton asymmetry is smaller than 0.1%, (iii) the direct CP violation in $B\to X_s \gamma$ can be as large as $\sim \pm 16 %$, (iv) the ${\rm Br} (B\to X_s l^+ l^-)$ can be enhanced by upto $\sim 85 %$ compared to the standard model (SM) prediction, and its correlation with ${\rm Br} (B \to X_s \gamma)$ is distinctly different from the minimal supergravity scenario. Also, we find $1 \leq \epsilon_K / \epsilon_K^{SM} \leq 1.4$, and $\epsilon_K$ cannot be saturated by the $A_t$ and $\mu$ phases alone : namely, $|\epsilon_K^{\rm SUSY}| \leq O(10^{-5})$ if the phases of $\mu$ and A_t are the sole origin of CP violation.
Authors:Seungwon Baek and Pyungwon Ko
Proposed speaker: Pyungwon Ko
Contact person:Pyungwon Ko
(KAIST),
pko@muon.kaist.ac.kr
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: (1) PROBING SUSY INDUCED CP VIOLATIONS AT B FACTORIES, By Seungwon Baek, Pyungwon Ko, Phys.Rev.Lett.83:488-491 (1999) (2) EFFECTS OF SUPERSYMMETRIC CP VIOLATING PHASES ON B ---> X(S) LEPTON+ LEPTON- AND EPSILON(K), By Seungwon Baek, Pyungwon Ko, Phys.Lett.B462:95-102 (1999)
Notes:
We consider possible new physics contributions to b\to s l^+ l^- assuming the new physics modifies (chromo)magnetic and electric form factors in b\to s \gamma^* and b\to s g with the same chirality structure as in the standard model. Parametrizing the new physics effects on b\to s \gamma^* and b\to s g in terms of four real parameters, one finds that there are enough region of parameter space in which the measured branching ratio for B \to X_s \gamma can be accomodated, and the predicted CP violation effect could be as large as \sim 30%. Moreover, the branching ratio and the forward-backward asymmetry of a lepton in B \to X_s l^+ l^- and the tau polarization asymmetry in B \to X_s \tau^+ \tau^- can be deviated from the SM predictions by a factor of \sim 2, which can be accessible at B factories.
Authors:Yeong Gyun Kim, Pyungwon Ko and Jae Sik Lee
Proposed speaker: Pyungwon Ko
Contact person:Pyungwon Ko
(KAIST),
pko@muon.kaist.ac.kr
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: (1) Yeong Gyun Kim, P. Ko, Jae Sik Lee, Nucl.Phys. B544 (1999) 64-88
Notes:
Using a theoretical framework based on the next-to-leading order QCD improved effective Hamiltonian, the two body charmless nonleptonic decays of $\Lambda_b$ baryon are studied within the framework of generalized factorization. We use the nonrelativistic quark model to evaluate the hadronic matrix elements and estimate the branching ratios for the decay modes $\Lambda_b \to p (\pi/\rho ), p ( K/ K^* ) and \Lambda ( \pi / \rho ) decay modes.
Authors:Rukmani Mohanta, Anjan K. Giri and M. P. Khanna
Proposed speaker: M. P. Khanna
Contact person:Mohinder Pal Khanna
(Panjab University),
khanna@panjabuniv.chd.nic.in
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) /
Supporting papers: To be provided before 1 July, 2000
Notes:
Tests of the Lorentz structure of t --> W b decay will be carried out at the Tevatron and later at the LHC and at a NLC. To assay future measurements of competing observables, we consider the g_(V-A) coupling values of the helicity decay parameters versus "(V-A) + single additional Lorentz structures". Three phase-type ambiguities exist, but measurement of the sign of the large interference between the W longitudinal/transverse amplitudes will exclude the two due dynamically to additional (S+P) and (f_M + f_E) couplings. Sizable direct T-violation signatures can occur for low-effective mass scales( <220 GeV), but in most cases can be more simply excluded by 10% precision measurement of the probabilities P(W_L) and P(b_L). CP-violation signatures, Lambda_b polarimetry, and the possible presence of T-violation associated with the phase-type ambiguities will be discussed.
Authors:Charles A. Nelson and L. J. Adler
Proposed speaker: Charles A. Nelson
Contact person:Charles A. Nelson
(SUNY at Binghamton),
cnelson@binghamton.edu
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
Implications of recent CLEO measurements of hadronic charmless B decays are discussed. The data of $B\to K\eta'$ and $K^*\eta$ clearly indicate that the nonfactorizable effects for (V-A)(V+A) are different from that of (V-A)(V-A). In order to understand the observed suppression of $\pi^+\pi^-$ and non-suppression of $K\pi$ modes, both being governed by the form factor $F_0^{B\pi}$, the unitarity angle $\gamma$ is preferred to be greater than $90^\circ$. By contrast, the new measurement of $B^\pm\to\rho^0\pi^\pm$ no longer strongly favors $\cos\gamma<0$. The sizeable branching ratios of $K^*\eta$ and the enormously large decay rates of $K\eta'$ indicate that it is the constructive interference of two comparable penguin amplitudes rather than the mechanism specific to the $\eta'$ that accounts for the bulk of $B\to \eta' K$ and $\eta K^*$ data.
Authors:Hai-Yang Cheng and Kwei-Chou Yang
Proposed speaker: Hai-Yang Cheng
Contact person:Hai-Yang Cheng
(Academia Sinica),
phcheng@ccvax.sinica.edu.tw
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
The QCD-based operator-product-expansion technique is systematically applied to the study of charmed meson lifetimes. We stress that it is crucial to take into account the momentum of the spectator light quark of charmed mesons, otherwise the destructive Pauli-interference effect in $D^+$ decays will lead to a negative decay width for the $D^+$. We have applied the QCD sum rule approach to estimate the hadronic matrix elements of color-singlet and color-octet 4-quark operators relevant to nonleptonic inclusive $D$ decays. The lifetime of $D_s^+$ is found to be longer than that of $D^0$ because the latter receives a constructive $W$-exchange contribution, whereas the hadronic annihilation and leptonic contributions to the former are compensated by the Pauli interference. We obtain the lifetime ratio $\tau(D_s^+)/\tau(D^0)$ $\approx 1.08\pm 0.04$, which is larger than some earlier theoretical estimates, but still smaller than the recent measurements by CLEO and E791.
Authors:Hai-Yang Cheng and Kwei-Chou Yang
Proposed speaker: Hai-Yang Cheng
Contact person:Hai-Yang Cheng
(Academia Sinica),
phcheng@ccvax.sinica.edu.tw
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
We study the effects of mass-averaging over the widths of rho and a sub 1 mesons, respectively, on the branching ratios of heavy baryon decays involving rho or a sub 1 meson in the final state. The smearing effects lead to the lowering of branching ratios by about 10-30 percent. We have also calculated the smeared branching ratios for the two body hadronic decays of B and B sub s mesons. The results thus obtained are in good agreement with the experimental values wherever available.
Authors:Harpreet Kaur and M. P. Khanna
Proposed speaker: Prof. M. P. Khanna
Contact person:Mohinder P. Khanna
(Panjab University),
mpkhanna@yahoo.com ; khanna@panjabuniv.chd.nic.in
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
Abstract: An estimate has been made on the masses of heavy hadrons in nonrelativistic quark model, which includes spin and flavor-dependent hyperfine splitting for two quarks. The effect of variation of the wavefunction value at origin i.e. psi squared and the strong coupling constant alpha sub s, with flavor, has also been included in calculating the mass values. Predictions have been made for the wavefunction value at origin respectively, for c and b-sectors.
Authors:Harpreet Kaur and M. P. Khanna
Proposed speaker: Prof. M. P. Khanna
Contact person:Mohinder P. Khanna
(Panjab University),
mpkhanna@yahoo.com ; khanna@panjabuniv.chd.nic.in
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
Two body nonleptonic decays of B sub s meson involving heavy to heavy transitions are discussed in detail. All these decay widths are estimated by the use of spectator model dominance. The form factors for various transitions are calculated in BSW model improved to O(1/m sub Q) by comparison with the heavy quark effective theory.
Authors:Harpreet Kaur and M. P. Khanna
Proposed speaker: Prof. M. P. Khanna
Contact person:Mohinder P. Khanna
(Panjab University),
mpkhanna@yahoo.com ; khanna@panjabuniv.chd.nic.in
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
We estimate the decay rate for the exclusive semileptonic decay, Lambda sub b into p e nu by splitting the q2(momentum transfer square) range into two regions of low and high q2. PQCD technique is used to evaluate form factors in large q2 region, whereas NRQM is employed for the low q2 region.
Authors:Harpreet Kaur and M. P. Khanna
Proposed speaker: Prof. M. P. Khanna
Contact person:Mohinder P. Khanna
(Panjab University),
mpkhanna@yahoo.com ; khanna@panjabuniv.chd.nic.in
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
Weak semileptonic and two body nonleptonic decays of B sub c meson are discussed in detail by making use of spectator model dominance. The form factors for various transitions are calculated in BSW model improved to O(1/m sub Q) by comparison with the heavy quark effective theory.
Authors:Aarti Girdhar, Harpreet Kaur and M. P. Khanna
Proposed speaker: Prof. M. P. Khanna
Contact person:Mohinder P. Khanna
(Panjab University),
mpkhanna@yahoo.com
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
The forward-backward asymmetries of the processes e+e- ->Z-> bbbar and e+e- ->Z-> ccbar are measured from the sample of hadronic Z decays collected by the DELPHI experiment between 1993 and 1995. Enriched samples of bbbar and ccbar events were obtained using lifetime information. The tagging of b and c quarks in these samples was based on the semileptonic decay channels b/c->X+mu and b/c->X+e combined with charge flow information from the hemisphere opposite to the lepton. Combining the b and c asymmetries measurements presented in this paper with already published results based on 1991 and 1992 data sample, pole asymmetries were computed and a value of sin**2(theta_w) was extracted for the 3.5 million hadronic Z decays collected by DELPHI
Authors:DELPHI Collaboration
Proposed speaker:
Contact person:Clara Matteuzzi
(),
Clara.Matteuzzi@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:Paper will be sent later
The forward-backward asymmetry of b quarks at the Z pole is measured in the 1992-1995 DELPHI data. The selected hadronic data sample is enriched in b quarks using an enhanced impact-parameter method. For each hemisphere defined with respect to the thrust axis the charge of the corresponding quark (antiquark) is determined using a neural feed forward net based on jet charge, vertex charge, information of heavy resonances and identified particle production. The probability of correctly identifying b (anti-b) quarks is measured from data using the rates of double hemisphere tagged like-sign and unlike-sign events, resulting in a self-calibration of the method. The new result significantly improves the precision of the b asymmetry measurement compared to previous DELPHI results using different techniques.
Authors:DELPHI Collaboration
Proposed speaker:
Contact person:Clara Matteuzzi
(),
Clara.Matteuzzi@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:Paper will be sent later
The forward-backward asymmetry of e+e- --> b bbar reactions was measured around the Z0 peak, using about 3 million hadronic Z0 decays collected with the DELPHI detector at LEP between the years 1992 and 1995. The measurement was performed on an enriched (b bbar)-sample selected by a combined b-tag, based on impact parameters and other kinematic variables. The bottom-quark charge was tagged by inclusively produced charged kaons identified mainly by the RICH detectors in the barrel region of the spectrometer. A dilution factor, comprising probabilities for correct charge determination, was extracted from data itself using double-tagged events. With this approach, the explicit estimation of purities and efficiencies of the selected kaon sample was avoided.
Authors:DELPHI Collaboration
Proposed speaker:
Contact person:Clara Matteuzzi
(),
Clara.Matteuzzi@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:Paper will be sent later
Oscillations of Bs meson were studied in inclusive samples of b-hadrons decays selected in hadronic Z0 events collected by the DELPHI detector at LEP from 1992 to 1995. Two different analyses were performed according to the decay topology. The inclusive lepton analysis requires the presence of a high pt lepton to reconstruct the B vertices and to tag the B at the decay time. An even more inclusive analysis uses displaced vertices to select hadronic B decays; to tag the B at decay time the vertex charge difference between the B and the D is used (dipole method). For both analyses the B at the production time is tagged using a new algorithm which combines several observables for the event. The combination of these two analyses with previously published results (Ds-l and inclusive Ds) allows to reach, for the DELPHI experiment alone, a sensitivity on Delta(m_s) around 12 ps-1.
Authors:DELPHI Collaboration
Proposed speaker:
Contact person:Clara Matteuzzi
(),
Clara.Matteuzzi@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:Paper will be sent later
A measurement of the inclusive B branching ratio into double charmed final states ( upper vertex D production ) has been performed using the data collected by the DELPHI experiment at LEP from 1994 to 1995. Charmed particles are exclusively reconstructed and the flavour of the weakly decaying B hadron is determined from a series of inclusive variables, combined into a single tag using a neural network technique. By correlating the exclusive D signal with the decay flavour tag, the result is extracted.
Authors:DELPHI Collaboration
Proposed speaker:
Contact person:Clara Matteuzzi
(),
Clara.Matteuzzi@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:Paper will be sent later
The semileptonic decay branching fractions of b-hadrons with narrow D**(1+, 2+) and broad resonant or non-resonant excited charmed particles produced in the final state have been measured separately in a sample of events registered by DELPHI at LEP1. Results have been compared with existing models.
Authors:DELPHI Collaboration
Proposed speaker:
Contact person:Clara Matteuzzi
(),
Clara.Matteuzzi@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:Paper will be sent later
Events with an identified lepton and a large missing energy have been selected in a sample of hadronic Z0 decays depleted in Z0 -> b bbar events. A discriminant analysis has been used to isolate candidates for the decay Ds+ -> tau+ nu(tau) with tau+ -> l+ nu(l) nu(tau)bar. The branching fraction Ds+ -> tau+ nu(tau) has been measured and the value for the Ds decay constant, f(Ds), has been obtained.
Authors:DELPHI Collaboration
Proposed speaker:
Contact person:Clara Matteuzzi
(),
Clara.Matteuzzi@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:Paper will be sent later
The slope of the form factor for the decay Lambda_b -> Lambda_c l nu is estimated using 3.46 10**6 hadronic Z decays collected by the DELPHI collaboration between 1992 and 1995. The squared momentum transfer to the lepton system and the event rate are both taken into account. The branching ratios for the semileptonic decays Lambda_b -> Lambda-c l nu , Lambda_b -> Lambda_c X l nu are measured, and an upper limit on some other exclusive semileptonic decay modes is given.
Authors:DELPHI Collaboration
Proposed speaker:
Contact person:Clara Matteuzzi
(),
Clara.Matteuzzi@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:Paper will be sent later
The lifetimes of the B0 and B+ mesons have been measured using the DELPHI detector at LEP for data collected during 1994 and 1995. B hadron vertices have been topologically reconstructed and then divided into charged and neutral B's using a neural network classification. This result complements the previous DELPHI measurement which used the data collected from 1991 to 1993.
Authors:DELPHI Collaboration
Proposed speaker:
Contact person:Clara Matteuzzi
(),
Clara.Matteuzzi@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:Paper will be sent later
The B hadron mixture produced at LEP includes B baryons leading to a significant increase of baryons in the final state as compared to pure B meson samples. In particular a measurement of the proton production rate in B hadron decays will give information on the B baryon content. DELPHI is well equipped to do such a measurement. Firstly, it provides an excellent particle identification over a wide momentum range using the RICH detector. Secondly, a powerful micro vertex detector gives a good separation of fragmentation and B hadron decay tracks. In this analysis the proton and kaon spektra are measured.
Authors:DELPHI Collaboration
Proposed speaker:
Contact person:Clara Matteuzzi
(),
Clara.Matteuzzi@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:Paper will be sent later
In an analysis of 3.5 million hadronic Z decays recorded with the DELPHI detector at LEP from 1992 to 1995, a strange b baryon, Xi_b, signal has been detected through a study of Xi-lepton charge correlations.The Xi_b lifetime and product branching ratio are measured.
Authors:DELPHI Collaboration
Proposed speaker:
Contact person:Clara Matteuzzi
(),
Clara.Matteuzzi@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:Paper will be sent later
A measurement of the inclusive branching ratios for tau decays containing one, three and five charged particles has been performed in Z->tautau decays at LEP-1.
Authors:DELPHI Collaboration
Proposed speaker:
Contact person:Clara Matteuzzi
(),
Clara.Matteuzzi@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:Paper will be sent later
Using the LEP-1 data collected with the DELPHI detector, we have measured the exclusive and semi-exclusive tau decay branching ratios containing the following: one charged hadron and 0,1,2 or greater than two neutral pions; three charged hadrons and 0,1 or greater than one neutral pion; five charged hadrons and zero or one neutral pion. The inclusive branching ratio for tau decay to neutral kaons as well as the exclusive branching ratios to modes including neutral kaons plus one charged hadron, one charged hadron plus a neutral kaon or one charged hadron plus a second neutral kaon have been measured. Analyses using both classical cuts and neural network methods have been performed to optimise the DELPHI neutral particle identification capability.
Authors:DELPHI Collaboration
Proposed speaker:
Contact person:Clara Matteuzzi
(),
Clara.Matteuzzi@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:Paper will be sent later
Using LEP-1 data collected in the DELPHI detector, we have measured the tau decay branching ratios for modes containing charged kaons. To optimise the charged kaon identification a combination of information from the DELPHI Ring-imaging Cherenkov detector and the TPC ionisation is used, allowing charged kaon/pion separation over the full momentum range.
Authors:DELPHI Collaboration
Proposed speaker:
Contact person:Clara Matteuzzi
(),
Clara.Matteuzzi@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:Paper will be sent later
The tau lifetime has been measured with different techniques using data taken up to and including 1995 in the DELPHI detector at LEP. Combining these new measurements with previously published DELPHI results provides an estimation of the tau lifetime.
Authors:DELPHI Collaboration
Proposed speaker:
Contact person:Clara Matteuzzi
(),
Clara.Matteuzzi@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:Paper will be sent later
An analysis of the exclusive rare decay (B->K + 2 photons) is presented. It is pointed out that the intermediate pseudoscalar resonance eta' has the dominant role in the long distance contributions to this B decay channel. This is due to the unexpected large branching ratio for the two body hadronic decay (B->K + eta') decay which was measured by CLEO. The braching ratio for (B->K +2 photon) is calculated to be around 8.7 X 10^(-7) which is more than twice as large as the eta_c contribution to this decay mode.
Authors:M. Ahmady
Proposed speaker: M. Ahmady
Contact person:Mohammad R Ahmady
(University of Western Ontario),
mahmady2@julian.uwo.ca
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: Physical Review D61, 077503 (2000).
Notes:
This paper describes a measurement of the four Michel parameters, and the average nu_tau helicity, in tau lepton decays together with the first measurement of the tensor coupling in the weak charged current. The tau+tau- pairs were produced at the LEP e+e- collider at CERN from 1992 through 1995 in the DELPHI detector. Assuming lepton universality in the decays of the tau the measured values of the parameters were: eta = -0.005 +- 0.036 +- 0.037, rho = 0.775 +- 0.023 +- 0.020, xi = 0.929 +- 0.070 +- 0.030, xi*delta = 0.779 +- 0.070 +- 0.028, h_nu = -0.997 +- 0.027 +- 0.011. The strength of the tensor coupling was measured to be kappa_tau = -0.029 +- 0.036 +- 0.018. The first error is statistical and the second error is systematic in all cases. The results are consistent with the V-A structure of the weak charged current in decays of the tau lepton.
Authors:DELPHI Collaboration
Proposed speaker:
Contact person:Clara Matteuzzi
(),
Clara.Matteuzzi@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:Paper will be sent later
The tau polarisation has been studied with data collected by the DELPHI detector at LEP in 1993, 1994 and 1995 around the Z resonance firstly through the exclusive decay channels into electron, muon, pion, rho and a_1. with an inclusive hadronic analysis which benefits from a higher efficiency and a better systematic precision. The results have been combined with those previously published on 1990 to 1992 DELPHI data, to produce results which reflect the full LEP-1 statistics. The fit of the tau polarisation dependence on the production angle yielded the polarisation parameters A_tau=0.1359 +- 0.0096 and A_e=0.1382 +- 0.0116. From these results the ratio of the vector and axial-vector effective couplings v_tau /a_tau = 0.0683+-0.0048 and v_e /a_e = 0.0694+-0.0058 have been derived, compatible with electron-tau universality. With the assumption of lepton universality, the ratio of vector to axial-vector effective couplings for leptons v_l /a_l = 0.0687+-0.0037 was obtained, implying a value of the effective weak mixing angle sin**2(theta) = 0.23282+-0.00092.
Authors:DELPHI Collaboration
Proposed speaker:
Contact person:Clara Matteuzzi
(),
Clara.Matteuzzi@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:Paper will be sent later
We present a search for electroweak production of single top quarks in the e+jets/mu and mu+jets/mu decay channels. The measurement uses ~90 pb**-1 of data from Run1 of the Fermilab Tevatron Collider collected with the DZero detector from 1992 to 1995. We set upper limits on cross sections for the s-channel process ppbar->tb+X and the t-channel process ppbar->tqb+X.
Authors:The DZero Collaboration
Proposed speaker: To be decided by DZero
Contact person:Bernard G. Pope
(Michigan State University),
pope@pa.msu.edu
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) /
Supporting papers:
Notes:
Bottom quark production in hadronic collisions is studied with the DZero detector at the Fermilab Tevatron pbar p collider at sqrt(s)=1.8TeV. The production cross section for jets containing b-quarks (b-jets) is measured in the pseudo-rapidity region |eta|<1. The differential cross section as a function of jet transverse energy is obtained from a sample of muon-tagged jets. With focus on b-jets rather than open b-quarks, this new measurement affords less model dependence in comparing data with theory. Within experimental and theoretical uncertainties, the observed cross section is higher than, but compatible with, next-to-leading order QCD predictions.
Authors:The DZero Collaboration
Proposed speaker: Andre Sznajder (DZero Collaboration)
Contact person:Bernard G. Pope
(Michigan State University),
pope@pa.msu.edu
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) /
Supporting papers:
Notes:
The DZero Collaboration has performed a study of spin correlation in ttbar production for the process ttbar->bW+ bbarW-, where the W bosons decay to enu or munu. A sample of six events was collected during an exposure of the DZero detector to an integrated luminosity of approximately 125 pb**-1 of sqrt(s)=1.8 TeV ppbar collisions. The standard model (SM) predicts that the short lifetime of the top quark ensures the transmission of any spin information at production to the ttbar decay products. The degree of spin correlation is characterized by a correlation coefficient K. We find that K>-0.25 at the 68% confidence level, in agreement with the SM prediction of K=0.88.
Authors:The DZero Collaboration
Proposed speaker: To be decided by the DZero Collaboration
Contact person:Bernard G. Pope
(Michigan State University),
pope@pa.msu.edu
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) /
Supporting papers:
Notes:
In the spring of 2001, the upgraded Fermilab Tevatron will begin its first collider physics run (Run II) with ppbar collisions at sqrt s = 2.0 TeV and a delivered integrated luminosity of 2 fb-1 in the first two years. The DZero detector is undergoing an extensive upgrade in order to take full advantage of this high luminosity running. The upgraded detector's new silicon vertex detector, inner tracker, and lepton trigger capabilities will make a rich B physics program possible at DZero. In this paper we discuss our prospects for CKM B physics measurements which include CP violation in B->J/psi+Ks decays, CP asymmetry in two body hadronic B decays, and Bs mixing.
Authors:The DZero Collaboration
Proposed speaker: To be decided by the DZero Collaboration
Contact person:Bernard G. Pope
(Michigan State University),
pope@pa.msu.edu
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) /
Supporting papers:
Notes:
The rare decays $B\to K^{(*)}\ell^+\ell^-$, $B\to K^{(*)}\nu\bar\nu$ and $B_s\to\mu^+\mu^-$ are analyzed in a generic scenario where New Physics effects enter predominantly via $Z$ penguin contributions. We show that this possibility is well motivated on theoretical grounds, as the $\bar sbZ$ vertex is particularly susceptible to non-standard dynamics. The characteristic features of this scenario for the relevant decay rates and distributions are discussed. In this respect the key role of sign and magnitude of the lepton forward-backward asymmetry in $\bar B\to \bar K^*\ell^+\ell^-$ is emphasized. An interesting test of non-standard CP violation by means of this asymmetry is also proposed.
Authors:G. Buchalla, G. Hiller and G. Isidori
Proposed speaker: G. Isidori
Contact person:Gino Isidori
(Laboratori Nazionali di Frascati),
isidori@lnf.infn.it
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) /
Supporting papers:
Notes:
We describe CLEO results on D0-D0bar and B0-B0bar mixing. Our final D0-D0bar mixing result from D0>K+pi- limits x' and y' to be (1/2)x'**2 < 0.041% and -5.8% < y' < 1.0% at 95% CL, allowing arbitrary CP violations. The direct DCSD D0>K+pi- rate is (0.332+0.063-0.065+-0.040)%, relative to D0>K-pi+. We discuss preliminary results using D0>K+K-, pi+pi-, K0S phi, K0S rho, and K0S omega, D0>K+pi-pi0 and other modes. Our final B0-B0bar mixing result, using doubly tagged events, where Upsilon(4S)>B0 B0bar and one B0 undergoes semileptonic decay, and other's decay to D*+pi- is partially reconstructed, is chi_d=0.199+-0.013+-0.014. CP violation in B0-B0bar state mixing is limited by |Re (\epsilon_B)|<3.4%.
Authors:CLEO
Proposed speaker: Harry N. Nelson
Contact person:Harry N. Nelson
(University of California, Santa Barbara),
hnn@hep.ucsb.edu
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: http://arXiv.org/abs/hep-ex/0001060 http://www.lns.cornell.edu/public/CLNS/2000/CLNS00-1668/mix.clns-1668.ps
Notes:
The importance of inelastic-scattering in charmless B-meson decays is emphasized. It then allows one consistently understand all the observed charmless B---> pi pi and pi K decays. The direct CP violations in the charmless B-meson decays are predicted and found to be observable in some of the channels.
Authors:Y.L.Wu et.al.
Proposed speaker: Yue-Liang Wu
Contact person:Yue-liang Wu
(Institute of Theoretical Physics),
ylwu@itp.ac.cn
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
It is shown that a new framework of heavy quark effective field theory allows one to make a systematic expansion, for both inclusive and exclusive decays, in terms of iv.k/m_Q with $k$ the residual momentum of heavy quark . Consequently, 1/m_Q corrections are automatically absent at zero recoil and the long time puzzle about the lifetime differences of bottom hadrons can be consistently understood. Thus the important CKM quark mixing matrix elements V_ub and V_cb can be well determined.
Authors:Y.L.Wu et.al.
Proposed speaker: Yue-Liang Wu
Contact person:Nobuhiko Katayama
(KEK),
nobu.katayama@kek.jp
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-04 Flavor Dynamics
Supporting papers:
Notes:
We calculate the branching ratios and CP asymmetries for B^0 to pi^+pi^-, pi^0pi^0 and B^+ to pi^+pi^0 decays, in a perturbative QCD approach. In this approach, we calculate non-factorizable and annihilation type contributions, in addition to the usual factorizable contributions. We found the annihilation diagram contributions are not very small as previous argument. Our result is in agreement with the measured branching ratio of B to pi^+pi^- by CLEO collaboration. With a non-negligible contribution from annihilation diagrams and a large strong phase, we predict a large direct CP asymmetry in B^0 to pi^+pi^-, and pi^0pi^0, which can be tested by the current running B factories.
Authors:Cai-Dian Lu, Kazumasa Ukai, Mao-Zhi Yang
Proposed speaker: Kazumasa Ukai
Contact person:Kazumasa Ukai
(Nagoya Univ.),
ukai@eken.phys.nagoya-u.ac.jp
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) /
Supporting papers: hep-ph/0004213, submitted to Physical Review D
Notes:
The newly observed $\overline B^0 \to \overline K^0\pi^0$ mode is quite sizable while $\pi^-\pi^+$ is rather small. Data also hint at $\pi^-\pi^0 \gtrsim \pi^-\pi^+$. Though consistent with zero, central values of $CP$ violating asymmetries in $K^-\pi^{+,0}$ and $\overline K^0\pi^-$ show an interesting pattern. Taking cue from these, we suggest that, besides $\gamma\equiv {\rm arg}\,(V_{ub}^*)$ being large, the rescattering phase $\delta$ in $K\pi$ and $\pi\pi$ modes may be greater than $90^\circ$. If this is true, not only the above trends can be accounted for, one would also find $\pi^0\pi^0 \sim \pi^-\pi^{+,0}$, and the $CP$ asymmetry in $\overline B^0$ vs. $B^0 \to \pi^-\pi^+$ could be as large as $-60\%$. These results can be tested in a couple of years.
Authors:W.S. Hou and K.C. Yang
Proposed speaker: W.S. Hou
Contact person:George W.S. Hou
(National Taiwan University),
wshou@phys.ntu.edu.tw
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: W.S. Hou and K.C. Yang, hep-ph/9911528, to appear in Phys.Rev.Lett. W.S. Hou and K.C. Yang, Phys.Rev.D61:073014,2000 X.G. He, W.S. Hou and K.C. Yang, Phys.Rev.Lett.83:1100,1999
Notes:
The most recent charm lifetime results from Fermilab fixed-target experiment FOCUS (E831) will be presented. These results represent a significant improvement on the best existing measurements.
Authors:Fermilab FOCUS Collaboration
Proposed speaker: Harry Cheung
Contact person:Harry W.K. Cheung
(Fermi National Accelerator Laboratory ),
cheung@fnal.gov
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: http://jhep.sissa.it/archive/prhep/preproceeding/003/022/cheung.ps
Notes:
We report results of a search for B+ => tau+nu in a sample of 9.7 million charged B meson decays. The search uses both pinu and lnunubar decay modes of the tau, and demands exclusive reconstruction of the companion B- decay to suppress background.
Authors:CLEO
Proposed speaker: CLEO
Contact person:David E Jaffe
(Cornell University),
cleoac@mail.lns.cornell.edu
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
We report updated branching fraction measurements of the decay modes B0 => Ds+ D*- and B0 => Ds*+ D*-. We report also first evidence for the predicted but as-yet-unobserved decay modes B+ => Ds(*)+ D0bar**. Here the Ds(*)+ can be either a Ds+ or a Ds*+, and the D0bar** can be any of three allowed neutral L=1 charm meson states: the narrow D1(2420) and D2*(2460) resonances, as well as the wide D1(j=1/2) resonance. These D0bar** states decay primarily to D*- pi+. We apply a partial-reconstruction technique where the Ds+ is fully reconstructed and combined with the slow pi- from the D*- =>D0bar pi- decay. A favorable D0bar decay is not required because the D0bar is not observed, gaining a factor of ten in statistics over previous full-reconstruction analyses.
Authors:CLEO
Proposed speaker: CLEO
Contact person:David E Jaffe
(Cornell University),
cleoac@mail.lns.cornell.edu
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
We report the first observation of two exclusive decays of the type B => D* N Nbar X, where N is a nucleon, and X denotes light mesons. The first such mode, B0 => D*- p pbar pi+ is reconstructed by standard methods, while the second, B0 => D*- p nbar is found using a novel method of anti-neutron identification. Shower selection criteria for anti-neutrons are derived from studies of anti-proton annihilation showers. The anti-neutron candidate direction is obtained from the shower, and the energy is obtained from energy conservation in the decay. This is the first use of anti-neutrons in the reconstruction of a B decay. The measured branching fractions are comparable to previous CLEO results for B => Lambda_c pbar pi (pi).
Authors:CLEO
Proposed speaker: CLEO
Contact person:David E Jaffe
(Cornell University),
cleoac@mail.lns.cornell.edu
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
We have searched for rare two-body charmless hadronic B decays in 9.7 million BBbar events at CLEO. We present first observation of B->Pi+Pi-, K0Pi0, and K+Pi0 decays, as well as improved measurements for B->K+Pi-, K0Pi+, K0K0 and Pi0Pi0 decays. We report on the improved measurements for Eta'K final states and the first observation of the EtaK* process and discuss theoretical models proposed to explain the anomalously high Eta'K decay rate. We have measured branching fractions for the decays B->Rho0Pi+, Rho+Pi-, and OmegaPi+, and improved the measurements for other related decay modes. The importance of these decays for future measurements of CKM angles alpha and gamma will be emphasized. Searches for direct CP violation in these decays will be presented.
Authors:CLEO
Proposed speaker: CLEO
Contact person:David E Jaffe
(Cornell University),
cleoac@mail.lns.cornell.edu
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: hep-ex/0001009,hep-ex/0001010,hep-ex/9912059
Notes:
We have searched for rare charmless B decays to the final states containing Phi and a light meson (Pi, K). Using the full CLEO-II and CLEO-II.V data set of 9.7 M BBar events, we report evidence of the B+ -> PhiK+ decay and present improved upper limits for other decay modes.
Authors:CLEO
Proposed speaker: CLEO
Contact person:David E Jaffe
(Cornell University),
cleoac@mail.lns.cornell.edu
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
The CLEO collaboration have searched for rare and forbidden B decays to the pair of charged leptons. Using the sample of 9.7 M BBar events collected with CLEO detector, we set new upper limits on the branching fractions for these decays.
Authors:CLEO
Proposed speaker: CLEO
Contact person:David E Jaffe
(Cornell University),
cleoac@mail.lns.cornell.edu
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
We have investigated correlations between charmed mesons and baryons in continuum e^+e^- annihilation data collected with the CLEO detector at CESR. A sample of events containing an anti-charmed meson in one hemisphere and an anti-proton in the opposite hemisphere has been isolated. Assuming that a Lambda_c is present to conserve charm and also baryon number, we measured the Lambda_c => pKpi yield in the hemisphere containing the antiproton and used this yield to estimate the Lambda_c => pKpi branching fraction. Numerical results for Br(Lambda_c => pKpi) using three different charm tags, as well as a discussion of the inherent systematic limitations of this technique are presented.
Authors:CLEO
Proposed speaker: CLEO
Contact person:David E Jaffe
(Cornell University),
cleoac@mail.lns.cornell.edu
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: hep-ex/0004001
Notes:
Using the large CLEO II and II.V datasets collected at the Cornell Electron Storage Ring, we have compared the Lambda_c production rate opposite a Lambda_c_bar antibaryon vs. the Lambda_c production rate opposite a Dbar meson in order to test the assumption of independent fragmentation. We see some evidence for an enhancement in the former case, indicating correlated production: e^+e^- => Lambda_c, Lambda_c_bar, X.
Authors:CLEO
Proposed speaker: CLEO
Contact person:David E Jaffe
(Cornell University),
cleoac@mail.lns.cornell.edu
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
Using 8.9 fb^-1 of e+e- data recorded near the Upsilon(4S) resonance by the CLEO II.V detector, the Lambda_c lifetime is measured with a precision of better than 4% using an unbinned maximum likelihood fit to the proper decay time distribution of Lambda_c => pKpi decays. The precision of this measurement is a substantial improvement over the current world-average value of the Lambda_c lifetime.
Authors:CLEO
Proposed speaker: CLEO
Contact person:David E Jaffe
(Cornell University),
cleoac@mail.lns.cornell.edu
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
We present a new study of the decay B -> X_u l nu in the lepton-energy end-point region. Our data sample was collected with the CLEO II detector, and is nearly ten times larger than that of CLEO's previous measurement. Past determinations of |V_{ub}/V_{cb}| using the end-point yield have been severely limited by model dependence. It has been proposed that dependence on the modeling of the hadronic dynamics in the decay can be greatly reduced by combining the end-point data with a measurement of the photon energy spectrum in B ->X_s gamma. CLEO II data should allow extraction of |V_{ub}| by this procedure in the near future.
Authors:CLEO
Proposed speaker: CLEO
Contact person:David E Jaffe
(Cornell University),
cleoac@mail.lns.cornell.edu
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
CLEO has studied the exclusive b -> u transitions B -> pi,l,nu and B -> rho/omega,l,nu using the 14 fb^{-1} of CLEO II data. As well as updating the branching fractions, CLEO has investigated a number of methods for extracting V_{ub} that take into account the kinematic ranges best suited for different form factor calculations. In addition, CLEO has new preliminary determinations of d\Gamma/dq^2 for these transitions.
Authors:CLEO
Proposed speaker: CLEO
Contact person:David E Jaffe
(Cornell University),
cleoac@mail.lns.cornell.edu
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: Phys. Rev.D61:052001,2000, Phys.Rev.Lett. 77 (1996) 5000:
Notes:
We report measurements of B0->J/psi K0 branching fraction from B0->J/psi K0S decays, with K0S reconstructed both in pi+pi- and pi0 pi0 modes. We present the first observations of the B0->J/psi pi0 and B0->chi_c1 K0S decays. We have measured the masses of the B0 and B+ mesons using the psi(')K invariant mass with significantly improved precision over previous measurements. We present a search for direct CP violation in B+- -> J/psi K+- and B+- -> psi(2S) K+- decays. We have measured the CP-violating charge asymmetry to be (+1.8+-4.3[stat]+-0.4[syst])% for B+- -> J/psi K+- and (+2.0+-9.1[stat]+-1.1[syst])% for B+- -> psi(2S) K+- mode. We discuss preliminary results on the search for B meson decays to chi_c2 mesons.
Authors:CLEO
Proposed speaker: CLEO
Contact person:David E Jaffe
(Cornell University),
cleoac@mail.lns.cornell.edu
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: Phys. Rev.D61:111101,2000, hep-ex/0003004
Notes:
We describe a high statistics Dalitz plot analysis of the the decay mode D0>K-Pi+Pi0 using data collected with the CLEO-II detector at the Cornell Electron Storage Ring. In addition to the previously published components (K*0, Rho+, K*- and K-Pi+Pi0 non-resonant) we find the data is best described by including the four additional resonances K0(1430)-, K0(1430)0, K*(1680)- and Rho'.
Authors:CLEO
Proposed speaker: CLEO
Contact person:David E Jaffe
(Cornell University),
cleoac@mail.lns.cornell.edu
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
We analyze 9.7 million BBbar pairs recorded with the CLEO detector to determine the production ratio of charged to neutral B mesons produced at the Y(4S) resonance. We measure the exclusive rates for B0 -> psi K(*)0 and B+ -> psi K(*)+ decays and employ the world-average B-meson lifetime ratio to extract the relative width f+-/f00 = Gamma(Y(4S) -> B+B-)/Gamma(Y(4S) -> B0B0bar) with an accuracy of ~7%(stat) and ~4%(syst). Our result is an improvement of about a factor of 2 over the previous measurements. This production ratio and its uncertainty apply to all exclusive B branching fractions measured at the Y(4S) resonance peak.
Authors:CLEO
Proposed speaker: CLEO
Contact person:David E Jaffe
(Cornell University),
cleoac@mail.lns.cornell.edu
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
Using a high-statistics sample of tagged events containing both a Dbar meson and an antiproton, we have conducted an analysis of the /\c semileptonic width. The presence of the Dbar and antiproton allows us to infer the presence of a /\c in the same event by conservation of charm and baryon quantum numbers. By measuring the electron content in our tagged sample, we can estimate the semileptonic branching fraction of the /\c, and compare the /\c semileptonic width with those of charmed mesons.
Authors:CLEO
Proposed speaker: CLEO
Contact person:David E Jaffe
(Cornell University),
cleoac@mail.lns.cornell.edu
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
We have investigated exclusive, radiative B meson decays in 9.7 million BBbar decays accumulated with the CLEO detector. The B -> K*(892),gamma branching fractions are determined to be Br(B0 -> K*0(892),gamma) = (4.55+0.72-0.68 +-0.34)e-5 and Be(B+ -> K*+(892),gamma) = (3.76+0.89-0.83 +-0.28)e-5. We have searched for CP asymmetry in B-> K*(892),gamma decays and measure A_CP = +0.08 +-0.13 +-0.03. We also report the first observation of the decay B -> K*2(1430),gamma with a branching fraction of (1.66+0.59-0.53 +-0.13)e-5 . No significant evidence for the decays B->rho/omega,gamma is found and we limit Br(B->rho/omega,gamma)/Br(B->K*(892),gamma) < 0.32 at 90% CL. We also find no evidence for the non-penguin decays B0->phi,gamma and B0->D*0,gamma. Non-observation of the latter decay provides evidence that weak radiative B decays are dominated by the b -> s,gamma short-distance mechanism of the Standard Model.
Authors:CLEO
Proposed speaker: CLEO
Contact person:David E Jaffe
(Cornell University),
cleoac@mail.lns.cornell.edu
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: hep-ex/0001002 , hep-ex/9912057
Notes:
From an analysis of the ionisation energy loss of charged particles selected from 110326 e+e- -> tau+tau- candidates recorded by the OPAL detector at e+e- centre-of-mass energies near the Z0 resonance, we determine the one-prong tau decay branching ratios Br(tau- -> nu_tau K- >=0h^0) and Br(tau- -> nu_tau K-), where h^0 notation referes to either a pi0, a K0S, or a K0L.
Authors:The OPAL collaboration
Proposed speaker:
Contact person:David J Miller
(CERN),
dave.miller@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: To be submitted to the conference and listed on http://opal.web.cern.ch/Opal/pubs/publications.html
Notes:
A measurement of the inclusive production rate of phi mesons from the decay of b hadrons produced at the Z0 energy was conducted, using data collected by the OPAL detector at LEP.
Authors:The OPAL collaboration
Proposed speaker:
Contact person:David J Miller
(CERN),
dave.miller@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: To be submitted to the conference and listed on http://opal.web.cern.ch/Opal/pubs/publications.html
Notes:
In a modified perturbative QCD method, We calculate B^+ -> pi^+ rho^0, pi^0 rho^+, pi^+ omega, and B^0 -> pi^+ rho^-, pi^- rho^+, pi^0 rho^0, and pi^0 omega decays. In this calculation, we include the non-factorizable diagram and annihilation type contributions, in adittion to the usual factorizable contributions. We found that the annihilation type contribution are not small as previous expectation. Our results of branching ratios are in agreement with recent CLEO measurements. We also predict large CP violations in these channels.
Authors:Cai-Dian Lu, Mao-Zhi Yang
Proposed speaker: Cai-Dian Lu
Contact person:Cai-Dian Lu
(Hiroshima University),
lucd@theo.phys.sci.hiroshima-u.ac.jp
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
Using the full LEP1 statistics an updated measurement of the tau branching ratios is given. A global analysis is performed to determine the branching fractions in 13 channels with a detailed study of the systematics. Using the branching ratios measured by ALEPH for final states involving kaons, results for exclusive final states in 35 channels are given. An improved separation of vector and axial-vector contributions is achieved for the nonstrange final states. Accurate tests are performed: lepton universality, a comparison of vector states with the corresponding ones in e+e- data (CVC tests) and an updated QCD analysis of hadronic decays.
Authors:ALEPH collaboration
Proposed speaker:
Contact person:Fabrizio Palla
(CERN),
Fabrizio.Palla@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
The BaBar collaboration will present a preliminary measurement of the tau-lepton lifetime using electron-positron annihilation data collected at center-of-mass energies near the Upsilon(4s) resonance.
Authors:The BaBar Collaboration
Proposed speaker:
Contact person:Fabrizio Bianchi
(Universita' di Torino),
bianchi@to.infn.it
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
We will present measurements of the D0 and D+ meson lifetimes using e+e- annihilation data collected with the BaBar detector at center-of-mass energies near the Upsilon(4S) resonance. The charm mesons are reconstructed in the decay modes D0->Kpi, D0->K3pi and D+ ->Kpipi. The D mesons are selected from continuum cc(bar) events and the measurements are based on flight length measurements in the plane transverse to the beam axis.
Authors:The BaBar Collaboration
Proposed speaker:
Contact person:Fabrizio Bianchi
(Universita' di Torino),
bianchi@to.infn.it
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
The BaBar detector at the PEP-II asymmetric-energy electron-positron B factory has been used to study the inclusive production of charmonium states in BB(bar) events. We will present measurements of the inclusive branching fractions of B->J/Psi X, B->Psi(2s) X and B->chi_1c X. We will also report on a search for the decay B->chi_2c X. Finally the momentum spectra and the polarization of the charmonium states (direct and cascade) will be discussed.
Authors:The BaBar Collaboration
Proposed speaker:
Contact person:Fabrizio Bianchi
(Universita' di Torino),
bianchi@to.infn.it
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
We will report on exclusive decays of B mesons into final states containing charmonium using the electron-positron annihilation data collected with the BaBar detector at center-of-mass energies near the Upsilon(4s) resonance. The charmonium states considered in this study are J/Psi, Psi(2s), Chi_c1 and eta_c. We will present branching ratios for several exclusive final states, a measurement of the decay amplitudes for B-> J/Psi K* decay and a measurement of the B0 and B+ mass difference.
Authors:The BaBar Collaboration
Proposed speaker:
Contact person:Fabrizio Bianchi
(Universita' di Torino),
bianchi@to.infn.it
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
With the electron-positron annihilation data recorded by the BaBar detector near the Upsilon(4s) resonance (sqrt(s) = 10.58 GeV), we have fully reconstructed the hadronic final states B0 -> D*- pi+ and B0 -> D*- rho+. In this paper we will report preliminary measurements of the branching ratios for these decay modes.
Authors:The BaBar Collaboration
Proposed speaker:
Contact person:Fabrizio Bianchi
(Universita' di Torino),
bianchi@to.infn.it
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
With the electron-positron annihilation data recorded by the BaBar detector near the Upsilon(4s) resonance (sqrt(s) = 10.58 GeV), we have fully reconstructed samples of B0 and B+ mesons in several exclusive hadronic decay modes and exclusive semileptonic B decay modes containing charm or charmonium mesons. In this paper we will report on a preliminary measurement of the lifetimes of the B0 and B+ mesons and the lifetime ratio tau(B+)/tau(B0).
Authors:The BaBar Collaboration
Proposed speaker:
Contact person:Fabrizio Bianchi
(Universita' di Torino),
bianchi@to.infn.it
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
The electron-positron annihilation data collected with the BaBar detector at center-of-mass energies near the Upsilon(4S) resonance are used to study flavor oscillations in the neutral B system. Flavor oscillations between B_d and B_d-bar mesons are observed using fully reconstructed B_d decays to all-hadronic and semi-leptonic final states. The flavor of the other B in the event is determined with tagging techniques that exploit the correlation between the flavor of the heavy quark and its decay products (leptons, kaons, high momentum tracks). The figure of merit for tagging is Q=epsilon_tag * (1-2w)^2, where epsilon_tag is the tagging efficiency and w is the mistag rate. The measurement of tagging performance in data is an important ingredient in CP violation studies. In this analysis we measure the time-dependent B0-B0(bar) oscillation frequency and determine the mistag rate.
Authors:The BaBar Collaboration
Proposed speaker:
Contact person:Fabrizio Bianchi
(Universita' di Torino),
bianchi@to.infn.it
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
We will present measurements of the B0 meson lifetime and mixing rate using partially reconstructed B0 decays to D*-pi+ and D*-lnu, where D*- ->D0(bar)pi- and l is either an electron or a muon. This study is performed with e+e- annihilation data collected by the BaBar detector near the Upsilon(4s) resonance. By exploiting the kinematics of the B0 decay at rest, the candidate events are identified without direct reconstruction of the D0(bar) decays. The decay B0->D*-pi+ is identified by reconstructing the mass of the missing D0(bar) candidate recoiling against the soft pi- from the D*- decay and the fast pion from the B0 decay. Similarly, the decay B0->D*-lnu is identified by reconstructing the mass of the missing neutrino candidate using the lepton and the kinematical correlation between the soft pion and the missing D*-. Taking advantage of the boost of the Upsilon(4S) system at the PEP-II storage ring, we measure the lifetime of the B0 meson from the distance (delta_z) between the decay vertices of the two B mesons. In addition, by tagging the flavor of the B meson, B0 mixing is observed and the mass difference delta(m_d)= m(B1)-m(B2) is measured from the delta_z dependence of the mixing rate. Finally, from the observed rate of the signal events the branching fraction for the decay mode B->D*-pi+ is determined.
Authors:The BaBar Collaboration
Proposed speaker:
Contact person:Fabrizio Bianchi
(Universita' di Torino),
bianchi@to.infn.it
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
We will present a measurement of the B0 mixing rate, the mass difference between the two mass eigenstates of the B0-B0(bar) system (delta_m_d), and the average B lifetime (B0 and B+) using semileptonic B decays. The electron-positron annihilation data collected with the BaBar detector at center-of-mass energies near the Upsilon(4s) resonance are used for this study. Events containing a pair of high-momentum leptons, which are enriched in semileptonic B decays, are used in the analysis. By exploiting the motion of the Upsilon(4s) system at the PEP-II storage ring, the time dependence of the B0-B0(bar) oscillation is observed in the time-dependent rate of same-sign and opposite-sign lepton pairs, leading to a measurement of the mass difference delta_m_d.
Authors:The BaBar Collaboration
Proposed speaker:
Contact person:Fabrizio Bianchi
(Universita' di Torino),
bianchi@to.infn.it
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
A preliminary measurement of the inclusive semileptonic branching fraction of B mesons will be presented. This measurement is based on data recorded at center-of-mass energies near the Upsilon(4s) resonance with the BaBar detector at the PEP-II asymmetric-energy B factory. BB(bar) events are tagged by a high momentum electron or muon. The measured momentum spectra are corrected for backgrounds from hadron misidentification, nonresonant hadronic events and leptons from other background sources. Charge and kinematic correlations are used to separate leptons from semileptonic B decays from those originating from secondary semileptonic charm decays. Monte Carlo simulations are used to correct for contributions from B decays other than tree level b -> c transitions.
Authors:The BaBar Collaboration
Proposed speaker:
Contact person:Fabrizio Bianchi
(Universita' di Torino),
bianchi@to.infn.it
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
We will present a study of the exclusive radiative electroweak penguin decay B -> K*(892) gamma using the e+e- annihilation data collected by the BaBar detector near the Upsilon(4s) resonance. Branching fractions for B0 ->K*0 gamma and B+ -> K*+ gamma will be presented for the various decay modes of the K*(892) resonance. The results of a search for CP asymmetry in the decay will also be discussed.
Authors:The BaBar Collaboration
Proposed speaker:
Contact person:Fabrizio Bianchi
(Universita' di Torino),
bianchi@to.infn.it
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
Electron-positron annihilation data collected by the BaBar detector near the Upsilon(4s) resonance are used to study the inclusive decay of B mesons to Ds and Ds* mesons. The Ds meson is identified using the decay Ds->phi pi. The production fraction of inclusive Ds(*) and the corresponding momentum spectra have been determined. The exclusive decays B0->Ds(*)+D*- are identified with a partial reconstruction technique requiring the soft pion from the D*- decay in association with the reconstructed Ds(*). The beam energy constraint is used to determine the missing mass recoiling against the Ds(*) system, showing a clear signal for this process. From the observed rates, the corresponding branching fractions have been measured.
Authors:The BaBar Collaboration
Proposed speaker:
Contact person:Fabrizio Bianchi
(Universita' di Torino),
bianchi@to.infn.it
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
We will present preliminary results on rare decays of charged and neutral B mesons to charmless two-body final states. This study is performed using the electron-positron annihilation data collected by the BaBar detector near the Upsilon(4s) resonance. We have studied the decay modes Kpi, pipi, and KK by using both charged and neutral kaons and pions. We measure branching fractions for the observed modes and set upper limits for modes without a significant signal.
Authors:The BaBar Collaboration
Proposed speaker:
Contact person:Fabrizio Bianchi
(Universita' di Torino),
bianchi@to.infn.it
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
We will present preliminary results of a search for several exclusive charmless hadronic B decays using electron-positron annihilation data collected by the BaBar detector near the Upsilon(4s) resonance. These include modes with final states h+h-h+ and h+h-h0, where h=pi,K. We also present results of a search for other exclusive quasi two-body decay modes with final states X0 h, where X0 includes eta, eta' and omega.
Authors:The BaBar Collaboration
Proposed speaker:
Contact person:Fabrizio Bianchi
(Universita' di Torino),
bianchi@to.infn.it
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
The data collected at the Upsilon(4S) resonance by the BABAR experiment at the PEP-II e+e- collider have been used to search for the rare decays B-> K l+ l- and B-> K* l+ l-, where l+ or l- is either an electron or a muon. These decays probe the flavor-changing neutral current process b->s l+ l-, which is sensitive to physics beyond the standard model.
Authors:The BaBar Collaboration
Proposed speaker:
Contact person:Fabrizio Bianchi
(Universita' di Torino),
bianchi@to.infn.it
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
In order to eliminate the model dependence of preasyptotic effects in inclusive heavy-hadron decays, a connection between charmed and beauty sectors has to be made. Assuming isospin and heavy-quark symmetry, we have obtained a set of relations connecting charmed and beauty decay rates without invoking specific models. We have established a relation revealing universality in decays of heavy hadrons. This relation enables us to introduce some order in otherwise rather intricate pattern of heavy-hadron lifetimes. The same method applied by relaxing the isospin symmetry and invoking SU(3) symmetry instead, and by assuming a very moderate model dependence, allows for predictions of lifetimes for beauty baryons.
Authors:B. Guberina, B. Melic and H. Stefancic
Proposed speaker: B. Melic
Contact person:Blazenka Melic
(Rudjer Boskovic Institute),
melic@thphys.irb.hr
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: 1. B. Guberina, B. Melic, H. Stefancic, "Lifetime-difference pattern of heavy hadrons" , hep-ph/0004264, submitted to Phys. Lett. B; 2. B. Guberina, B. Melic, H. Stefancic, "Enhancement of preasymptotic effects in inclusive beauty decays", Phys. Lett. B469 (1999) 253, hep-ph/9907468; 3. B. Melic, "Preasymptotic effects in b decays", talk given at The Third International Conference on B physics and CP Violation, Taipei, Taiwan, 3 - 7 December, 1999, hep-ph/0001280, to appear in the Proceedings
Notes:
We present a new measurement of Rc, the branching fraction of the Z to primary charm quarks, using a novel multitag method. Four tags, based on kinematic and lifetime variables, are used to separate light from charm from bottom quark jets. The rates of single- and double- tagged events are used to measure many of the tag efficiencies and some of the interhemisphere tagging correlations, greatly reducing the overall systematic errors.
Authors:The OPAL collaboration
Proposed speaker:
Contact person:David J Miller
(CERN),
dave.miller@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: To be submitted to the conference and listed on http://opal.web.cern.ch/Opal/pubs/publications.html
Notes:Also of interest to sessions PA-05 and PL-06a, Electroweak Gauge Theory and Precision Tests of Standard Model
The lifetime and oscillation frequency of the B0 meson has been measured using B0->D*lv decays recorded on the Z0 peak using the OPAL detector at LEP. The D*->D0 pi+ decays were reconstructed using an inclusive technique and the production flavour of the B0 mesons was determined using a combination of tags from the rest of the event.
Authors:The OPAL collaboration
Proposed speaker:
Contact person:David J Miller
(CERN),
dave.miller@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: To be submitted to the conference and listed on http://opal.web.cern.ch/Opal/pubs/publications.html
Notes:
We measure the masses, decay widths and relative production rate of orbitally excited B mesons using 1.25 million hadronic Z decays recorded by the L3 detector. B-meson candidates are inclusively reconstructed and combined with charged pions produced at the primary event vertex. An excess of events above the expected background in the B pi mass spectrum in the region 5.6-5.8 GeV is interpreted as resulting from the decay B**_{UD} -> B(*) pi, where B**_{UD} denotes a mixture of l=1 B-meson states containing a u or a d quark. A fit to the mass spectrum yields the masses and decay widths of the $B*_{1}$ and $B*_{2}$ spin states, as well as the branching fraction for the combination of l=1 states. In addition, evidence is presented for the existence of an excited B-meson state or mixture of states in the region 5.9-6.0 GeV.
Authors:L3 Collaboration
Proposed speaker: L3 speaker
Contact person:Simonetta Gentile
(CERN),
Simonetta.Gentile@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: L3 Collaboration, M. Acciarri et al., Phys. Lett. B 465/1-4 (21 October, 1999) 323-334. CERN-EP/99-116, 5 August 1999. L3 preprint 181. Measurement of the Spectroscopy of Orbitally Excited B Mesons at LEP
Notes:
The tau lepton lifetime is measured with the L3 detector at LEP using the complete data taken at centre-of-mass energies around the Z pole resulting equal to 293.2 +- 2.0(stat)+- 1.5 (syst) fs. The comparison of this result with the muon lifetime supports lepton universality of the weak charged current at the level of six per mille. Assuming lepton universality, the value of the strong coupling constant, alpha_s is found to be alpha_s(m_(tau)^2) = 0.319 +- 0.015(exp) +- 0.014(theory).
Authors:L3 Collaboration
Proposed speaker: L3 speaker
Contact person:Simonetta Gentile
(CERN),
Simonetta.Gentile@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: L3 Collab., M. Acciarri et al., Physics letters B accepted CERN-EP-2000-040; 10 February 2000. L3 preprint 205. Measurement of the Lifetime of the Tau Lepton.
Notes:
J/Psi cross sections are measured with the HERA-B spectrometer in proton-nucleon collisions at a center-of-mass energy of $\sqrt{s}=42$ GeV. The differential cross section as function of XF and Pt is compared with theoretical predictions.
Authors:HERA-B Collaboration
Proposed speaker: Ulrich Uwer <uwer@ifh.de>, Speaker's Buero
Contact person:Michael Schmelling
(),
Michael.Schmelling@mpi-hd.mpg.de
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:7/18/00 TY-Withdrawn from a talk.
The E835 collaboration has continued the study of charmonium states formed in antiproton-proton annihilations with data taking occuring April-July, 2000. Study of the chi_c0 (3P0) was emphasized in April. In May, h_c (1P1) studies were done. The remaining data taking time will be to complete studies of the chi_c0 and h_c. The first results of these investigations will be presented.
Authors:Fermilab E835
Proposed speaker: Keith Gollwitzer
Contact person:Keith E Gollwitzer
(Fermi National Accelerator Laboratory),
gollwitz@fnal.gov
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) /
Supporting papers:
Notes:
The decays Bd->pi+pi- and Bs->K+K- are related via U-spin symmetry, a sub-group of SU(3) flavor. We show how this symmetry can be exploited to extract the CKM angle gamma from measurements of CP asymmetries in Bd->pi+pi-, Bs->K+K-, and Bd->J/psi K0. In particular, we present a chisquare fit to the experimental observables and discuss the systematic error due to SU(3) symmetry breaking effects. Experimental errors of about 0.1 on the CP violating asymmetries in pi+pi- and K+K- result in extraction of gamma to better than 10 degrees for most of the allowed parameter space. Systematic errors due to SU(3) breaking are small, and can be constrained experimentally. All the experimental measurements are within reach of the upcoming run of the CDF experiment at Fermilab. We thus conclude that this is one of the most promising methods so far for obtaining a precision measurement of the CKM angle gamma.
Authors:Robert Fleischer, Frank Wuerthwein
Proposed speaker: Robert Fleischer
Contact person:Frank Wuerthwein
(MIT),
fkw@fnal.gov
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: Robert Fleischer, PLB 459, 306 (1999) Frank Wuerthwein, contributed paper ICHEP-2000.
Notes:
The lifetimes of B+ and B0 mesons have been measured using the entire sample of polarized Z0 decays collected by the SLD experiment between 1993 and 1998. We report the inclusive analysis of the 400,000 hadronic Z0's collected between 1996 and 1998 using the upgraded vertex detector (VXD3). Approximately 50,000 B hadron decay vertices are reconstructed with good charge purity. This charge purity is then enhanced using vertex information, as well as information on the initial state flavor of the hemisphere containing the vertex. Combining these results with the previously published 1993-95 SLD results (based upon the 150,00 hadronic Z0's obtaining using the VXD2 vertex detector), we obtain individual meson lifetimes with total errors between 2 and 3%, and a total error on the lifetime ratio of approximately 3.5%.
Authors:SLD Collaboration
Proposed speaker: to be announced
Contact person:Stephane Willocq
(University of Massachusetts),
willocq@slac.stanford.edu
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
We report a preliminary measurement of the time dependence of B0- B0-bar mixing using a sample of 400,000 hadronic Z0 decays collected by the SLD experiment at the SLC. B decay vertices are reconstructed inclusively with a topological technique and the B hadron flavor at production is determined by exploiting the large forward-backward asymmetry of polarized Z0 -> b b-bar decays in combination with information from the hemisphere opposite that of the reconstructed B decay. The flavor of the B hadron at decay is provided by the charge of kaons attached to the B decay vertex and identified with the Cherenkov Ring Imaging Detector. The measurement of the oscillation frequency allows the determination of delta(m_d) with a statistical accuracy of ~ 0.03 ps**-1.
Authors:SLD Collaboration
Proposed speaker: to be announced
Contact person:Stephane Willocq
(University of Massachusetts),
willocq@slac.stanford.edu
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
We report several studies of the time dependence of Bs - Bs-bar mixing using a sample of 400,000 hadronic Z0 decays collected by the SLD experiment at the SLC. The analyses take advantage of the excellent vertexing efficiency and resolution of the pixel-based CCD Vertex Detector. All analyses determine the B or B-bar flavor at production by exploiting the large forward-backward asymmetry of polarized Z0 -> b b-bar decays. This flavor tag is enhanced by incorporating additional information from the hemisphere opposite that of the reconstructed B decay. Four separate analyses are presented. Two analyses select semileptonic B decays. These analyses differ in the technique used to reconstruct the B decay vertex: inclusive reconstruction using the lepton and all tracks in the jet, and lepton with a topologically reconstructed D vertex Two analyses reconstruct inclusive B decays by either fully reconstructing a Ds decay or by topologically reconstructing both B and D decay vertices. The separation between B and B-bar decays is based on the lepton charge in the first two analyses, and the Ds charge or the charge difference between B and D vertices in the last two analyses. The analyses are combined to set a lower limit on the Bs mixing oscillation frequency with a sensitivity comparable to that of the current world average.
Authors:SLD Collaboration
Proposed speaker: to be announced
Contact person:Stephane Willocq
(University of Massachusetts),
willocq@slac.stanford.edu
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
We present a new measurement of the branching fractions of B hadrons decaying to 0, 1, and 2 charm hadrons, with a novel vertexing analysis. The measurement is performed on a sample of 350,000 Z's collected during the SLD/SLC 97-98 run. The analysis takes advantage of the excellent vertexing resolution of the VXD3, a pixel-based CCD vertex detector, which allows the separation of B and cascade D decay vertices. Analysis of the decay length distributions for each of the 1-, 2-, and 3-vertex topologies allows the extraction of the inclusive branching fractions. The statistical errors for the 1, 2, and 3 charm branching fractions are expected to be, respectively, 0.013, 0.025, and 0.016.
Authors:SLD Collaboration
Proposed speaker: to be announced
Contact person:Stephane Willocq
(University of Massachusetts),
willocq@slac.stanford.edu
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
A new method to observe top quark mass spectrum using 6-jets events in the all-jet channel is presented using Monte Carlo. A kinematic analysis of 6-jets events can be described in series of 2-body kinematics. From the calculation, the HT values are shown very effective cuts. The top mass spectrum can be obtained by subtracting the normalized mass spectrum of non-tagged events from the tagged mass spectrum. The selected events can be shown in 2-jets and 3-jets mass plain. c-tagging is shown important as well as b-tagging for mass analysis.
Authors:Ryuji Yamada, Fermilab and Bjoern Schmekel, Hamburg Univ.
Proposed speaker: Ryuji Yamada, Fermilab
Contact person:Ryuji Yamada
(Fermilab),
yamada@fnal.gov
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) /
Supporting papers:
Notes:R. Yamada, "C Tagging of Jets from W Decays", Fermilab-FN-625, October 1994. M. Dennis and R. Yamada,"Relativistic kinematics of top quark decay in some simple cases of the 6-jet all-hadronic channel", D0-note 3307, March 1998.
In this talk I report on several new results concerning exclusive B decays in the heavy quark limit: (1) Proof of factorization beyond one loop for B -> D^+ pi^- and related decays. (2) Application of QCD factorization [1] to B -> pi K decays and the determination of the CKM angle gamma. (3) Corrections to heavy quark symmetry relations between heavy-light form factors at large recoil.
Authors:Beneke
Proposed speaker: Beneke
Contact person:Martin Beneke
(RWTH Aachen),
mbeneke@physik.rwth-aachen.de
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: [1] Beneke, Buchalla, Neubert, Sachrajda, Phys Rev Lett 83 (1999) 1914; [2] Beneke, Buchalla, Neubert, Sachrajda, to appear; [3] Beneke, Feldmann, to appear.
Notes:
A new precise measurement of V_cb and of the branching ratio BR(B0 into D*+lv)selected by the DELPHI detector at LEP I by tagging the soft pion from D* decaying into D0+pi. The analytic dependence of the differential cross section and of the Isgur Wise form factor as a function of the variable w = v_B0 x v_D* have also been obtained by unfolding the experimental resolution.
Authors:DELPHI Collaboration
Proposed speaker:
Contact person:Clara Matteuzzi
(Universita di Milano),
Clara.Matteuzzi@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:Contributed paper will follow
Oscillations of B0_s mesons have been studied in samples selected from about 3.5 million hadronic Z decays detected by DELPHI between 1992 and 1995. One analysis uses events in the exclusive decay channels of B_s into D_s pi or D_s a_1, and B_s into D0 K- pi+ or D0 K- a_1+, where the D0 decays are completely reconstructed. In addition, B0_s oscillations have been studied in events with an exclusively reconstructed D_s accompanied in the same hemisphere by a high momentum hadron of opposite charge. Combining the two analyses, a limit on the mass difference between the physical B0_s states has been obtained. Using the latter sample of events, the B_s lifetime has been measured and an upper limit on the decay width difference between the two physical B_s states has been obtained.
Authors:DELPHI Collaboration
Proposed speaker:
Contact person:Clara Matteuzzi
(Universita di Milano),
Clara.Matteuzzi@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:Contributed paper will follow
The semileptonic branching fractions for primary and cascade b decays were measured in hadronic Z decays collected by the DELPHI experiment at LEP from 1992 to 1995. The sample was enriched in b decays using the lifetime information and various techniques were used to separate leptons from direct or cascade b decays. By fitting the momentum spectra of di-leptons in opposite jets, the average b mixing parameter chi was also extracted. The following results have been obtained: Br(b --> l) = (10.73+-0.08(stat)+-0.22(syst) -0.30+0.44}(model))% Br(b --> c --> l)= (7.91 +-0.20 (stat)+-0.29(syst) +0.14-0.20(model))% Br(b --> cbar --> l)= (1.69+-0.18 (stat)+-0.26(syst) +0.30-0.44(model))% chi =0.127 +-0.013(stat)+-0.006(syst)+-0.004(model)
Authors:DELPHI Collaboration
Proposed speaker:
Contact person:Clara Matteuzzi
(Universita di Milano),
Clara.Matteuzzi@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:Contributed paper will follow
Fermilab fixed target experiment FOCUS collected over one million reconstructed charm mesons during the 1996-1997. We present relative branching ratio measurements of D+ and Ds+ decays with a Ks in four body final states. Two of these measurements are improvements on previous measurements and three are measurements of previously unseen decay modes.
Authors:Hwanbae Park (FOCUS Collaboration)
Proposed speaker: Hwanbae Park
Contact person:Hwanbae Park
(Korea University),
hbpark@hep.korea.ac.kr
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
We study a rate asymmetry in the inclusive radiative decay of the $B$ meson within the framework of the supersymmetric standard model. This decay could receive a large contribution from a new source of flavor-changing neutral current, which also violate $CP$ invariance. The decay rate asymmetry is predicted to be much larger than that by the standard model in a wide region of the parameter space. Its magnitude can be maximally around 0.1, which will be accessible at $B$ factories.
Authors:M. Aoki, G.C. Cho, and N. Oshimo
Proposed speaker: N. Oshimo
Contact person:Noriyuki Oshimo
(Ochanomizu University),
oshimo@phys.ocha.ac.jp
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: M. Aoki, G.C. Cho, and N. Oshimo, Phys. Rev. D60 (1999) 035004; Nucl. Phys. B554 (1999) 50.
Notes:
We determine the CKM matrix element |Vcb| using a sample of 3 million BBbar events in the CLEO detector at CESR. We reconstruct the decays B- --> D*0lnu and B0bar-->D*+lnu. By studying their yields as a function of w = v_B . v_D* and extrapolating to w=1, the kinematic point at which the final state D* is at rest relative to the B, we extract the product |Vcb|h_A1(1), where h_A1(1) is the form factor at w=1 and is accurately provided by theory. We also determine the B-->D*lnu branching fractions by integrating over w. This is the most precise determination of the branching fractions to date, and is the most precise determination of |Vcb| using the B --> D*lnu decay.
Authors:CLEO
Proposed speaker: CLEO
Contact person:David E Jaffe
(Cornell University),
cleoac@mail.lns.cornell.edu
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
The Standard Model predicts equality of the rates for b -> s gamma and b_bar -> s_bar gamma at the level of 1% or less. Recent theoretical work suggests the possibility that non-SM physics may lead to CP asymmetries in excess of 10%. We will report a measurement of that asymmetry, consistent with zero, based on a sample of 10 million BBbar decays.
Authors:CLEO
Proposed speaker: CLEO
Contact person:David E Jaffe
(Cornell University),
cleoac@mail.lns.cornell.edu
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: hep-ex/9908022
Notes:
We present results of searches for D0-D0bar mixing and CP violation in D0, D+ decays using data from Fermilab experiment E791. We searched for mixing using D0's from D*+ decays which in turn decay into K pi, K pi pi pi and K l nu decay modes. We find no evidence for mixing in either semileptonic or hadronic channels and set upper limits r_mix < 0.50% and r_mix < 0.85%, respectively. We obtain an independent constraint upon r_mix by measuring Delta Gamma, the difference in width between the two mass eigenstates of the neutral D system. Results of searches for CP violation in D decay modes are also reported. These results have smaller statistical error than previously published measurements.
Authors:Fermilab E791 collaboration
Proposed speaker: Alan Schwartz
Contact person:Milind V Purohit
(Univ of S. Carolina),
e791l@scuch8.psc.sc.edu
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-02 CP Violation and Rare Decays ( Kaon, Muon )
Supporting papers: Search for DDbar mixing in Semileptonic Decay Modes, E. M. Aitala et al., Phys. Rev. Lett. 77:2384 (1996) ``Search for CP Violation in Charged D Meson Decays'' E. M. Aitala et al., Phys. Lett. B403:377 (1997). ``A Search for D0 - Anti-D0 Mixing and Doubly Cabibbo Suppressed Decays of the D0 in Hadronic Final States'', E. M. Aitala et al., Phys. Rev. D57, 13 (1998) ``Lifetimes and lifetime difference between D0 -> KK and D0 -> K pi'', E. M. Aitala et al., Phys. Rev. Lett. 83:32, 1999.
Notes:
We present the results of an exact calculation of gluon radiation in top production and decay at high energy electron-positron colliders. We include all spin correlations and interferences, the bottom quark mass, and finite top width effects in the matrix element calculation. We study properties of the radiated gluons and implications for top mass measurement. We also discuss virtual corrections to the process.
Authors:Cosmin Macesanu and Lynne H. Orr
Proposed speaker: Lynne H. Orr
Contact person:Lynne H. Orr
(University of Rochester),
orr@pas.rochester.edu
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
New results on searches for the decays of charm mesons to vector mesons and a pair of leptons will be reported. Such decays would appear to come from Flavor Changing Neutral Currents or violate Lepton Number and/or Flavor Symmetries The measurements are the result of blind analyses. A total of 27 decay channels have been examined, of which only 9 have results reported in the literature.
Authors:Fermilab E791 collaboration
Proposed speaker: Jeff Appel
Contact person:Milind V Purohit
(Univ of S. Carolina),
e791l@scuch8.psc.sc.edu
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: ``Search for Rare and Forbidden Dilepton Decays of the D+, D+(S), and D0 Charmed Mesons'', E. M. Aitala et al., Phys. Lett. B462:401-409, 1999.
Notes:
We present recent results in B physics from the CDF experiment. This talk will highlight measurements from Run I of the hadron collider aimed at constraining the the CKM matrix: the measurement of sin(2Beta) from B^0->J/Psi K^0_s, B^0_s \bar{B^0_s} oscillations, and radiative penguin decays. These topics are of longer term interest and will be prominent in Run II, due to begin early next year.
Authors:The CDF Collaboration
Proposed speaker: Joe Boudreau
Contact person:Joseph F Boudreau
(University of Pittsburgh),
joe@cactus.phyast.pitt.edu
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
We present results of searches for \ddbar\ mixing and \cp\ violation in $D^0,\ D^\pm$ decays. The data were taken at Fermilab E791, which used a 500 GeV/$c\,$ $\pi^-$ beam incident on foil targets to produce charm hadrons. To search for mixing we select $D$'s produced via $D^{*\pm}\rightarrow D\pi^\pm$ decays, which tags their initial flavor, and then identify their flavor at decay using \dklnu\ and $D^0\rightarrow K^-\pi^+,\ K^-\pi^+\pi^-\pi^+$ channels (note: charge conjugate modes are included). We find no evidence for mixing in either semileptonic or hadronic channels and set upper limits $r^{}_{mix}<0.50$\% and $r^{}_{mix}<0.85$\%, respectively. We obtain an independent constraint upon $r^{}_{mix}$ by measuring $\Delta\Gamma$, the difference in width between the two $D^0/\bar{D}^0$ mass eigenstates. We have searched for \cp\ violation in the neutral modes \dkk\ and \dpipi, and in the charged modes $D^+\rightarrow K^-K^+\pi^+,\ \phi\,\pi^+,\ \overline{K}^{*0}K^+$, and $\pi^-\pi^+\pi^+$. Our measurements of the \cp\ asymmetry parameter ${\cal A}(f)\equiv (\Gamma_{D\rightarrow f} - \Gamma_{\bar{D}\rightarrow\bar{f}})/ (\Gamma_{D\rightarrow f} + \Gamma_{\bar{D}\rightarrow\bar{f}})$ are consistent with zero for all modes. All measurements have less statistical error than previously published measurements, and the results for \dpipi\ and \dppp\ are the first such results reported.
Authors:Fermilab E791 Collaboration (E. M. Aitala et al)
Proposed speaker: A. J. Schwartz
Contact person:Jeffrey A Appel
(Fermilab),
appel@fnal.gov
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: E. M. Aitala et al., Phys. Rev. Lett. 77 (1996) 2384 E. M. Aitala et al., Phys. Lett. B403 (1997) 377 E. M. Aitala et al., Phys. Rev. D57 (1998) 13 E. M. Aital et al., Phys. Lett. B421 (1998) 405 E. M. Aitala et al., Phys. Rev. Lett. 83 (1999) 32
Notes:
I will talk about the most general model-independent analysis of the semi-leptonic and pure-leptonic rare B decays. We presented the branting ratio, the forward-backward asymmetry in the B->X_s l^+ l^- decays and the lepton polarization asymmetries in the B->X_s tau^+ tau^- as functions of the Wilson coeffients of 12 independent four-Fermi interactions. In this talk, I will also present the branching ratio and the lepton polarization asymmetry in the purely leptonic B decays, B->l^+l^- and the correlations among them. These procedures will tell us which type of operators contribute to the process and it will be very useful to pin down new physics systematically.
Authors:T.Yoshikawa
Proposed speaker: T.Yoshikawa
Contact person:Tadashi Yoshikawa
(KEK ),
yosikawa@acorn.kek.jp
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: S.Fukae, C.S. Kim, T.Morozumi and T.Yoshikawa, Phys.Rev.D59 (1999) 074013, S.Fukae. C.S. Kim and T.Yoshikawa, Phys.Rev. D61 (2000) 074015, S.Fukae, C.S. Kim and T.Yoshikawa, hep-ph/0003053
Notes:
We study the semi-leptonic rare B decays (B-K^*(K) ll) in the frame work of Perturbative QCD. The invariant mass deistribution, forward backward asymmetry, and azimuthal angle distributions are computed in this framework. The uncertainties of theoretical predictions coming from the wave functions are also discussed.
Authors:T. Morozumi
Proposed speaker: T. Morozumi
Contact person:Takuya Morozumi
(Hiroshima University),
morozumi@theo.phys.sci.hiroshima-u.ac.jp
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
We fit rare charmless $B\to PP$, $PV$ decay rates, including a few known after 1999, to factorization formulas. Effective $N_c \simeq 2.5$ is found to be close to naive value of 3, while two form factors and an effective strong interaction parameter are close to theoretical expectations. Such agreement and the good $\chi^2$ of the fit suggest that factorization may be adequate for the modes fitted within present experimental accuracy. Intriguingly, the fitted phase of $V_{ub}$ is at some variance with the value obtained via a CKM unitarity fit dominated by $B_s$ and $B_d$ mixing ratio.
Authors:W.S. Hou, J.G. Smith and F. Wurthwein
Proposed speaker: (George) W.S. Hou
Contact person:George W.S. Hou
(National Taiwan University),
wshou@phys.ntu.edu.tw
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: W.S. Hou, J.G. Smith and F. Wurthwein, hep-ex/9910014.
Notes:
To study exclusive B decays to light mesons such as B -> pipi decays, it is important to know the wave function of light mesons with large lightcone momentum. We use the Large Energy Effective Theory based on 1/E expansion (2E is the lightcone momentum) and applied to 1+1 dimensional QCD and in Large Nc limit. Using the bilocal auxiliary field, we develop the above formalism in path-integral. We obtain the wave function for lightmesons in lightcone space coordinate and the result is compared with the lightcone QCD approach in Hamiltonian formalism.
Authors:S. Kuroki, K. Morikawa, T. Morozumi, S. Fukae
Proposed speaker: S. Fukae
Contact person:Seiji Fukae
(Hiroshima Univ.),
fukae@hiroshima-u.ac.jp
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
We calculate the $\chi_{c_J}$ production cross section in $e^+ e^-$ annihilation in the framework of Non-relativistic QCD (NRQCD) factorization approach. In previous works it has been argued that the process is dominated by the 1-loop amplitude corresponding to $e^+ e^- \rightarrow \gamma^* \gamma^* \rightarrow \chi_{c_J}$ with $\gamma^*$ the virtual photon. We show that the 1-loop amplitude suffers from the infrared (IR) divergence due to the soft momentum-configuration of a virtual photon. We demonstrate that this IR divergence can be cancelled out by the corresponding real-photon emission contributions to the $\chi_{c_J}$ production cross section. Thus the process can be described by the factorization framework with the infrared finite Wilson coefficients and the matrix elements of the dimension-8 NRQCD operators to produce the P-wave quarkonium states.
Authors:Jiro Kodaira, Kazuhiro Tanaka, Yuichiro Kiyo
Proposed speaker: Yuichiro Kiyo
Contact person:Yuichiro Kiyo
(Tohoku University),
kiyo@tuhep.phys.tohoku.ac.jp
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
Fermilab fixed target experiment FOCUS has fully reconstructed in excess of one million charm particles from data collected during the 1996-1997 fixed target run. Results (many are pre- liminary) on CP violation, D0 - D0bar mixing, rare and forbidden decay modes will be shown.
Authors:FOCUS (E831)
Proposed speaker: Will E. Johns
Contact person:Will E Johns
(Vanderbilt University),
will.johns@vanderbilt.edu
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
A sample of 62,245 flavor tagged b decay candidates in the 1993-1998 SLD data set has been used to measure the direct and indirect b quark inclusive semi-leptonic branching fractions (b->l)/(b->all) and (b->c->l)/(b->all). These branching fractions have been determined separately for electrons and muons. Exploiting the unique strengths of the SLD detector, the analysis techniques are substantially different from those used at CLEO and at LEP. In spite of a much smaller data-set these measurements yield preliminary results with statistical and systematic errors that are comparable to previous measurements.
Authors:SLD Collaboration
Proposed speaker: to be announced
Contact person:Stephane Willocq
(University of Massachusetts),
willocq@slac.stanford.edu
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
We compute the matrix element for B -> pi l nu semileptonic decay near zero recoil using lattice QCD simulation. The matrix elements are fitted to a function which is a sysmatic expansion of pion mass^2, pion energy and 1/m_B. We then obtain the form factors which are converted to the differential decay rate
Authors:JLQCD collaboration
Proposed speaker: Tetsuya Onogi
Contact person:Tetsuya Onogi
(Hiroshima Univ.),
onogi@theo.phys.sci.hiroshima-u.ac.jp
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-05 Lattice Field Theory
Supporting papers:
Notes:
The cross-section for semi-inclusive inelastic photoproduction of J/psis decaying into mu+ mu- has been measured with the ZEUS detector at HERA using an integrated luminosity of 38 pb-1. The J/psi events satisfied 0.4 < z < 1 and 50 < W < 180 GeV, where z is the photon-energy fraction carried by the J/psi in the proton rest-frame and W is the photon-proton centre-of-mass energy. The data in the range 0.4 < z < 0.9, 50 < W < 180 GeV and p_T(J/psi) > 1 GeV are compared to recent theoretical predictions.
Authors:ZEUS Collab
Proposed speaker:
Contact person:Stefan Schlenstedt
(DESY),
stefan.schlenstedt@ifh.de
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
The production of excited charm mesons has been observed with the ZEUS detector at HERA using an integrated luminosity of approximately 100 pb-1. Neutral orbitally excited P-wave charm mesons have been reconstructed in the D*+- pi-+ final state. The fraction of D*+- mesons originating from the decays of these mesons has been calculated. A search for radially excited charm mesons in the D*+- pi+ pi- final state has been also performed. The results are compared with those obtained in e+e- annihilation and with QCD expectations.
Authors:ZEUS Collaboration
Proposed speaker:
Contact person:Stefan Schlenstedt
(DESY),
stefan.schlenstedt@ifh.de
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
The production of D*+-(2010) mesons in deep inelastic scattering has been studied with the ZEUS detector at HERA using an integrated luminosity of approximately 100 pb-1. The decay channel D*+ -> D0 pi+ with D0 -> K-pi+ (+c.c.) was used to identify D* mesons. Differential D* cross sections as a function of Q^2 and Bjorken x were measured for Q^2>10 GeV^2. The increase in luminosity with respect to previous measurements allows an extension of the kinematic range to larger Q^2 and x. The data are compared to NLO QCD calculations and to several LO Monte Carlo models.
Authors:ZEUS Collaboration
Proposed speaker:
Contact person:Stefan Schlenstedt
(DESY),
stefan.schlenstedt@ifh.de
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
The photoproduction of beauty particles has been studied in ep interactions with the ZEUS detector at HERA using an integrated luminosity of 37 pb-1. The beauty signal has been extracted from events with two jets and a muon in the final state by fitting the transverse momentum distribution of the muon with respect to the associated jet. The results are compared with LO Monte Carlo predictions and with NLO QCD calculations
Authors:ZEUS Collaboration
Proposed speaker:
Contact person:Stefan Schlenstedt
(DESY),
stefan.schlenstedt@ifh.de
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
The first measurement of inclusive Ds+- photoproduction at HERA has been performed with the ZEUS detector for photon-proton centre-of-mass energies 130 < W < 280 GeV. The measurements are compared with inclusive D*+- photoproduction cross sections in the same kinematic region and with QCD calculations. The ratio of Ds+- to D*+- cross sections has been determined and used to extract the strangeness-suppression factor in charm photoproduction within the LUND string fragmentation model. The results are in good agreement with those obtained from charm production in e+e- annihilation.
Authors:ZEUS Collaboration
Proposed speaker:
Contact person:Stefan Schlenstedt
(DESY),
stefan.schlenstedt@ifh.de
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
We report the results of searches for the decays Bs -> J/psi Ks Bs -> J/psi K* Bs -> J/psi Ks Ks Bs -> J/psi K* Ks Bs -> J/psi K*bar Ks Bs -> J/psi K* K*bar and related Bd and Bu modes using CDF Run I data. These modes will be useful in CDF Run II for a variety of CKM related physics measurements including Bs mixing, searches for non-Standard Model CP violation, and studies of angular correlations of the decay products to extract CP even vs. odd components of the Bs. There are no previously published branching fractions or limits for any of these modes.
Authors:Stephen Bailey/CDF
Proposed speaker: Stephen Bailey, Joseph Boudreau, or Christoph Paus
Contact person:Stephen J Bailey
(Harvard University),
bailey@fnal.gov
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:CDF internal notes 5254, 5255, and 5299
In the perturbative QCD approach to exclusive B decays to two light mesons, the leading twist contribution corresponds to those diagrams in the Lepage-Brodsky expansion in which the would be spectator quark receives its recoil momentum via one gluon exchange. We show that the resulting amplitude, which in the spectator model is real, acquires an imaginary part which may be comparable in size to its real part. Thus, this source of the strong interaction phase in the amplitude must be taken into account in general to discuss, reliably, the expectations for CP violation in B decays at any B-Factory type scenario.
Authors:B.F.L. Ward
Proposed speaker: B.F.L. Ward
Contact person:Bennie F.L. Ward
(University of Tennessee),
bflw@slac.stanford.edu
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: 1.B.F.L. Ward, hep-ph/9806310 v.2, July,1999, submitted to E. Phys. J. C. 2.B.F.L. Ward, Phys. Rev.D51(1995)6253 3.B.F.L. Ward, "CP Violation in Exclusive B Decays: Recoil Phase Effect", UTHEP-00-0102, to appear
Notes:
Using data collected with the CLEOII and CLEOII.V detectors consisting of nearly 10 million BBbar decays, we have searched for the b -> u transition B+ -> eta l+ nu.
Authors:CLEO
Proposed speaker: CLEO
Contact person:DavidE E Jaffe
(Cornell University),
cleoac@mail.lns.cornell.edu
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
In 1995 the CLEO collaboration made the first measurement of the HQET consistent form factors in a charm baryon semileptonic decay. We present a preliminary updated analysis that uses a data sample 5 times larger.
Authors:CLEO
Proposed speaker: Victor Pavlunin
Contact person:Victor E Pavlunin
(Purdue University),
victor@physics.purdue.edu
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) /
Supporting papers:
Notes:
Durnig the run I phase Bd Mixing and and the CP violation parameter sin(2 beta) have been measured in B meson decays at the Tevatron proton-antiproton collider. During the run II phase CDF plans to improve on those measurements and further measure Bs mixing and the remaining two angles of the unitarity triangle, sin(2 alpha) and gamma. This allows to stringently constrain the unitarity triangle and test its closure. Particular emphasize is put on the hadronic trigger and the particle identification which are essential for these measurements and where not available during run I.
Authors:CDF Collaboration
Proposed speaker: Christoph Paus
Contact person:Christoph M.E. Paus
(Massachusetts Institute of Technology),
paus@mit.edu
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
The proximity of the top mass to the scale of electroweak symmetry breaking makes top a likely candidate to be sensitive to new physics. With a 20 fold increase in statistics over Run 1 from the first part of Run 2 of the Tevatron, precise measurements of top quark properties will be very important as a test for new physics. We survey our current understanding of the top quark at CDF and discuss future prospects of top measurements in Run 2. We also present new single top limits and discuss the importance of single top in Run 2 as a direct probe of the electroweak tWb vertex.
Authors:CDF Collaboration
Proposed speaker: to be determined soon
Contact person:Mark Kruse
(University of Rochester),
mkruse@fnal.gov
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
Within the Standard Model, a review of the current determination of the sides and angles of the CKM unitarity triangle is presented, using experimental constraints from the measurements of epsilonK, Vub/Vcb, Delta(md) and from the limit on Delta(ms), available in Summer 2000. Peculiar attention has been devoted in the determination and in the study of the contributions of lattice QCD theoretical uncertainties. Results from the experimental search on Bs-Bsbar oscillations are introduced using the likelihood ratio approach. Finally classical fitting techniques have been compared with the scanning approach adopted in other publications. The present analysis comfirms and extend the work done previously by the authors and accurate determinations of the sides and angles of the unitarity triangle are given.
Authors:F. Caravaglios, M. Ciuchini, G. D'Agostini, E. Franco, L. Giusti, V. Lubicz, G. Martinelli, F. Parodi, P. Roudeau, A. Stocchi
Proposed speaker: one of us
Contact person:Achille Stocchi
(IN2P3_CNRS et Universite de Paris-Sud),
stocchi@lal.in2p3.fr
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: M.Ciuchini,E.Franco,L.Giusti,V.lubicz,G.Martinelli hep-ph/9910236 F.Parodi,P.Roudeau,A.Stocchi Il Nuovo Cimento 112A,N.8.(1999) 833 F.Caravaglios,F.Parodi,P.Roudeau,A.Stocchi hep-ph/0002171 (proceeding of BCP'99)
Notes:
We report measurements of $B$ and charmed meson lifetimes using a large data sample collected in the Belle detector at the KEKB $e^+e^-$ collider. In addition to providing new and independent lifetime determinations, these measurements demonstrate the level of understanding of the vertexing performance of the Belle detector. For the $D^0$ and the $D_s$ meson lifetimes, our results have a precision comparable to that of the present best measurements.
Authors:Belle collaboration
Proposed speaker: Hiroyasu Tajima
Contact person:Hiroaki Aihara
(University of Tokyo),
aihara@phys.s.u-tokyo.ac.jp
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-01b New Results from e+e- B-factories : BELLE
Supporting papers:
Notes:
We report on a determination of the $B^0 \bar B^0$ mixing parameter $x_d$ from the time evolution of dilepton events contained in a large sample of $\Upsilon$(4S) decays recorded in the Belle detector at KEKB. The proper-time-difference distributions for the same-sign and opposite-sign dilepton events are simultaneously fit to an expression containing $x_d$ as a free parameter. This is the first direct determination of $x_d$ using $\Upsilon$(4S) decays.
Authors:Belle collaboration
Proposed speaker: Yoshihide Sakai
Contact person:Hiroaki Aihara
(University of Tokyo),
aihara@phys.s.u-tokyo.ac.jp
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-01b New Results from e+e- B-factories : BELLE
Supporting papers:
Notes:
We perform a search for several charmless hadronic $B$ meson decay modes to charged particle final states using a large data sample recorded on the $\Upsilon$(4S) resonance by the Belle experiment at KEKB. The two final states, $B\rightarrow K^{\pm} \pi^\mp$ and $B\rightarrow \pi^\pm \pi^\mp$, can be clearly separated using the high momentum particle identification system of the Belle detector.
Authors:Belle collaboration
Proposed speaker: to be determined
Contact person:Hiroaki Aihara
(University of Tokyo),
aihara@phys.s.u-tokyo.ac.jp
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-01b New Results from e+e- B-factories : BELLE
Supporting papers:
Notes:
We report a study of exclusive and inclusive radiative $B$ meson decay using a large data sample recorded at the $\Upsilon(4S)$ resonance by the Belle experiment at KEKB. We present a measurement of the branching fraction for $B\rightarrow K^*\gamma$ decay. We also utilize the excellent high momentum particle identification system of the Belle detector to search for the $B\rightarrow \rho\gamma$ decay mode.
Authors:Belle collaboration
Proposed speaker: MIkihiko Nakao
Contact person:Hiroaki Aihara
(University of Tokyo),
aihara@phys.s.u-tokyo.ac.jp
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-01b New Results from e+e- B-factories : BELLE
Supporting papers:
Notes:
We compute branching ratios of B->K\pi decays using perturbative QCD factorization theorem. Decay amplitudes are classified into the topologies of tree, penguin, and annihilation, all of which contain both factorizable and nonfactorizable contributions. It is shown that (1) nonfactorizable contributions are negligible; (2) matrix elements of penguin operators are dynamically enhanced compared to those employed in the factorization approach; (3) annihilation diagrams contribute large strong phases; (4) the uncertainty of current data is too large to give a constraint of the unitarity angle \phi 3; (5) the B->K\pi and \pi\pi data can be simulataneously explained by assuming \phi 3=90^o.
Authors:Yong-Yeon Keum, Hsiang-nan Li, A.I. Sanda
Proposed speaker: Hsiang-nan Li
Contact person:Hsiang-nan Li
(National Cheng-Kung University),
hnli@mail.ncku.edu.tw
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:(008)
Cabbibo favored process of b-quark decay b -> c c-bar q give a sizeable contribution to charmless B-meson decay channels. Among them B -> K eta-prime is a very intriguing channel. Colorless virtual charm currents give a contribution which is too small to explain experimental data. Here color virtual charm currents contributions into this and related processes are considered. These currents are reduced to specific local gluon operators within modified Shwinger operator approach with further transformation into effective light quark currents. It is shown that this mechanism gives very considerable contribution to the B -> K eta-prime and to similar processes.
Authors:M. Musakhanov (Uzbekistan National University)
Proposed speaker: M. Musakhanov
Contact person:Mirzayusuf Musakhanov
(Uzbekistan National University),
yousuf@iaph.silk.org, yousuf@ymhome.silk.org
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:Colorless virtual charm currents in B -> K eta-prime was considered in many papers. See, for example, F.Araki, M.Musakhanov, H.Toki, Phys.Rev.D59(1999)037501. The details of the applications of Shwinger operator approach to virtual charm effects was considered by the same authors in hep-ph/9808290. (014)
The recent observation of open b production in ep collisions at HERA is reported. A b enriched event sample containing muons and jets has been selected. The muons are detected in the range 35< theta < 130 degrees for transverse momenta above 2 GeV. The visible cross section is measured to be 0.176+-0.016+0.026-0.017 nb while a NLO QCD calculation results in 0.104+-0.017 nb. The cross sections for electroproduction with Q^2<1 GeV^2 and photoproduction are derived from the data and found to be sigma(ep-> e bbbar X)=7.1+-0.6+1.5-1.3 nb and sigma(gamma p-> bbbar X)=111+-10+23-20 nb at an average W gammap of 180 GeV, respectively.
Authors:H1 Collaboration
Proposed speaker: An H1 Speaker
Contact person:Peter Schleper
(DESY),
Peter.Schleper@desy.de
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:see hep-ex/9909029 (080)-980
bbbar production has been observed in ep collisions at an ep centre-of-mass energy of 300 GeV. For the first time at HERA a centrally installed silicon vertex detector is used to identify b-hadrons by their decay length.
Authors:H1 Collaboration
Proposed speaker: An H1 Speaker
Contact person:Peter Schleper
(DESY),
Peter.Schleper@desy.de
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes: (081)-979
The production cross section of charged D* mesons in deep inelastic scattering has been measured using an integrated luminosity of 18.6 pb^-1 with the H1 detector at the ep collider HERA. The cross section, over the kinematic range 1 < Q^2 < 100 GeV^2, 0.05 < y < 0.7, p T(D*) > 1.5 GeV and abs(eta(D*)) < 1.5, is presented in differential and double differential distributions of p T(D*), eta(D*), Q^2, x Bj, W and x D*. These are compared to next-to-leading order QCD expectations. In addition, the charm contribution to the proton structure function, F 2^{ccbar}(x,Q^2), has been determined.
Authors:H1 Collaboration
Proposed speaker: An H1 Speaker
Contact person:Peter Schleper
(DESY),
Peter.Schleper@desy.de
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes: (083) 5/17/00 TK/TY-Above sessoins are the 2nd choice. Same as #983.
Elastic photoproduction of Heavy Vector Mesons (e^+p -> e^+ V p) at HERA is measured using events with muonic and electronic decays. Elastic psi' meson photoproduction is identified via the direct decay into two leptons and the cascade decay in a J/psi meson and two charged pions. The ratio sigma(psi')/sigma(J/psi) is determined as a function of the hadronic center of mass energy W gammap. In addition the momentum transfer dependence of the cross section is extracted.
Authors:H1 Collaboration
Proposed speaker: An H1 Speaker
Contact person:Peter Schleper
(DESY),
Peter.Schleper@desy.de
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes: (084) 5/17/00 TK/TY-Above sessions are the 2nd choice. Same as #987.
A measurement of the inelastic photoproduction cross section of the process e^+p -> e^+ J/psi X at HERA is presented. The J/psi meson is identified via its muonic decay channel. Single differential cross sections in a region of very low J/psi inelasticity z and double differential cross sections are extracted. Theoretical predictions including color singlet and color octet contributions are compared to the data.
Authors:H1 Collaboration
Proposed speaker: An H1 Speaker
Contact person:Peter Schleper
(DESY),
Peter.Schleper@desy.de
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes: (088)-988
Cross sections for elastic photoproduction of J/psi and Upsilon mesons are presented. For J/psi mesons the dependence on the photon-proton centre-of-mass energy is analysed in an extended range with respect to previous measurements of 26<=Wgammap<=285 GeV. The measured energy dependence is parameterized as sigma gammap propto W gammap^delta with delta=0.83+-0.07. The differential cross section dsigma/dt for J/psi mesons is derived, its dependence on Wgammap and on t is analysed and the effective trajectory (in terms of Regge theory) is determined to be alpha(t)=(1.27+-0.05)+(0.08+-0.17)*t/GeV^2. Models based on perturbative QCD and on pomeron exchange are compared to the data.
Authors:H1 Collaboration
Proposed speaker: An H1 Speaker
Contact person:Peter Schleper
(DESY),
Peter.Schleper@desy.de
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:see hep-ex/0003020 (090) 5/17/00 TK/TY-Above sessoins are the 2nd choice. Same as #990.
We use data recorded in the Belle detector operating at the KEKB storage ring to measure the inclusive branching fraction for $B\rightarrow \pi^0 X$ and the momentum spectrum of neutral pions from the decays of the $\Upsilon(4S)$ resonance. In addition, the shape of the high momentum region of the $\pi^0$ spectrum is used to place constraints on hadronic $b\rightarrow u$ processes.
Authors:Belle collaboration
Proposed speaker: to be determined
Contact person:Hiroaki Aihara
(University of Tokyo),
aihara@phys.s.u-tokyo.ac.jp
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-01b New Results from e+e- B-factories : BELLE
Supporting papers:
Notes:
We present an observation of $B^- \to D^0 K^-$ decay with the Belle detector at the KEKB $e^+ e-$ storage ring. The high momentum particle identification system of Belle allows the signal to be clearly separated from the much larger $B^- \to D^0\pi^-$ background. We will determine the ratio of branching fractions, $Br(B^- \to D^0 K^-)/Br(B^- \to D^0\pi^-)$. Reconstructed signals in exclusive $B\to D \pi$ and $B\to D^* \pi$ decay modes will be used to verify the performance of Belle, and the parameters of the detector and the accelerator.
Authors:Belle collaboration
Proposed speaker: to be determined
Contact person:Hiroaki Aihara
(University of Tokyo),
aihara@phys.s.u-tokyo.ac.jp
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-01b New Results from e+e- B-factories : BELLE
Supporting papers:
Notes:
We report on a study of inclusive semileptonic $B$ meson decays using a large data sample recorded by the Belle detector at the KEK-B $e^+e^-$ storage ring. We present a measurement of inclusive $B\rightarrow X \ell \nu$ branching fraction. By comparing the inclusive single lepton yield with that from di-lepton correlations, we place an improved upper limit on the non-$B\bar{B}$ fraction of the $\Upsilon(4S)$ decays.
Authors:Belle collaboration
Proposed speaker: to be determined
Contact person:Hiroaki Aihara
(University of Tokyo),
aihara@phys.s.u-tokyo.ac.jp
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-01b New Results from e+e- B-factories : BELLE
Supporting papers:
Notes:
We report results of a study of $B$ meson decays to final states containing charmonium states using a large data sample collected in the Belle detector at KEKB. Particular emphasis is on the identification of as yet unidentified exclusive final states that could be useful for studies of indirect CP violations.
Authors:Belle collaboration
Proposed speaker: Steve Olsen
Contact person:Hiroaki Aihara
(University of Tokyo),
aihara@phys.s.u-tokyo.ac.jp
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-01b New Results from e+e- B-factories : BELLE
Supporting papers:
Notes:
We present a measurement of the polarization of $J/\psi$ in $B^0 \rightarrow J/\psi + K^{*0}$ and $B^+ \rightarrow J/\psi+ K^{*+}$ decays. The data sample has been taken at the $\Upsilon(4S)$ with the Belle detector at the KEKB accelerator. The measured polarization value is compared with the previous measurements. The results of the branching fraction measurements for $B \rightarrow J/\psi +K^*$ and $B \rightarrow J/\psi + K$ are also presented.
Authors:Belle collaboration
Proposed speaker: Ryosuke Itoh
Contact person:Hiroaki Aihara
(University of Tokyo),
aihara@phys.s.u-tokyo.ac.jp
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-01b New Results from e+e- B-factories : BELLE
Supporting papers:
Notes:
We report searches for $B^+\to K^+ \pi^0$ and $B^+\to \eta^\prime K^+$ using a large data sample recorded at the $\Upsilon(4S)$ resonance by the Belle Experiment at the KEKB $e^+ e^-$ storage ring. Two $\eta^\prime$ decay channels, $\eta^\prime \to {\eta\pi\pi}$ and $\eta^\prime \to {\rho\gamma}$, have been considered. Both a simple counting method and a likelihood fit are applied to determine signal yields. The high momentum particle identification system of Belle allows modes such as $B^+\to K^+ \pi^0$ and $B^+\to \pi^+ \pi^0$ to be clearly separated. Results of a search for $B^+\to \eta^\prime \pi^+$ are also reported.
Authors:Belle collaboration
Proposed speaker: P.Chang
Contact person:Hiroaki Aihara
(University of Tokyo),
aihara@phys.s.u-tokyo.ac.jp
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-01b New Results from e+e- B-factories : BELLE
Supporting papers:
Notes:
We report searches for the rare decays $B^+ \rightarrow \omega h^+$ and $B^+ \rightarrow \phi h^+$ using a large data sample recorded at the $\Upsilon(4S)$ resonance by the Belle experiment at the KEKB $e^{+} e^{-}$ storage ring. Both the slice-cut method and the likelihood method are used to obtain signal yields. The high momentum particle identification system allows modes such as $B^+\to K^+ \omega$ and $B^+\to \pi^+ \omega$ to be clearly separated. Results of a search for $B^{+}\rightarrow\omega/\phi K^{+}$ will also be given.
Authors:Belle collaboration
Proposed speaker: to be determined
Contact person:Hiroaki Aihara
(University of Tokyo),
aihara@phys.s.u-tokyo.ac.jp
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-01b New Results from e+e- B-factories : BELLE
Supporting papers:
Notes:
We report results of a search for non-CKM type T/CP violation phenomena in tau-lepton interactions using CP-odd momentum correlations in the process $e^+ e^-\rightarrow\tau^+\tau^-$ observed with the Belle detector at KEKB. The results are evaluated in terms of a possible electric dipole moment of the tau lepton. In addition, we exploit the Belle detector's excellent particle identification capabilities to look for CP-violating asymmetries in the spatial distributions of $\tau^-\to \pi^-\pi^0\nu$ and $K\pi\nu$ decays.
Authors:Belle collaboration
Proposed speaker: to be determined
Contact person:Hiroaki Aihara
(University of Tokyo),
aihara@phys.s.u-tokyo.ac.jp
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-01b New Results from e+e- B-factories : BELLE
Supporting papers:
Notes:
We report results of a search for $\tau^-\to e^- K^0$ and \mu^- K^0$ using $\tau$ pairs produced in the process $e^+ e^-\rightarrow\tau^+\tau^-$ at the $\Upsilon(4S)$ resonance energy and observed in the Belle detector at KEKB. The large data sample and the excellent lepton identification capabilities of Belle provides a two-order-of-magnitude improvement in sensitivity over previous searches.
Authors:Belle collaboration
Proposed speaker: to be determined
Contact person:Hiroaki Aihara
(University of Tokyo),
aihara@phys.s.u-tokyo.ac.jp
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-01b New Results from e+e- B-factories : BELLE
Supporting papers:
Notes:
Using the event sample of $e^+ e^-$ collision at $E_{\rm CM} = 10.58$ GeV recorded with the Belle detector, we have studied exclusive semileptonic $B$ decays, $\bar{B}^0 \rightarrow D^{*+} \ell^- \bar{\nu}$ and $\bar{B}^0 \rightarrow D^+ \ell^- \bar{\nu}$. With good hadron-identification and vertexing capability of the Belle detector, we measure the branching fractions of these reactions and their kinematical properties.
Authors:Belle collaboration
Proposed speaker: to be determined
Contact person:Hiroaki Aihara
(University of Tokyo),
aihara@phys.s.u-tokyo.ac.jp
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-01b New Results from e+e- B-factories : BELLE
Supporting papers:
Notes:
Using $e^+ e^-$ collision data sample recorded with the Belle detector at KEK at $E_{\rm CM} = 10.58$ GeV, we have studied the Kaon-lepton correlations in the $\Upsilon (4S)$ decays and obtained flavor-specific inclusive charged Kaon production rates in $B$ decays. By comparing the obtained Kaon yields with the other $B$ decay phenomena, we search for new physics in the charmless decays of $B$ mesons.
Authors:Belle collaboration
Proposed speaker: Youngjoon Kwon
Contact person:Hiroaki Aihara
(University of Tokyo),
aihara@phys.s.u-tokyo.ac.jp
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-01b New Results from e+e- B-factories : BELLE
Supporting papers:
Notes:
Using a large data sample from the Belle experiment at KEKB, we have searched for $B\rightarrow D_S^{(*)} \pi$ decays. Precise measurements of these can be used to place constraints on hadronic $b\rightarrow u$ processes. With good hadron-identification and vertexing capability of the Belle detector, we obtain improved upper limits on these reactions.
Authors:Belle collaboration
Proposed speaker: to be determined
Contact person:Hiroaki Aihara
(University of Tokyo),
aihara@phys.s.u-tokyo.ac.jp
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-01b New Results from e+e- B-factories : BELLE
Supporting papers:
Notes:
Indirect violation of discrete symmetries in a neutral meson system makes reference to the non-invariance properties of the effective hamiltonian which governs the time evolution of mesons. For the kaon system, this study has been performed by the CP-LEAR experiment from the flavour-to-flavour evolution, which allows the construction of observables which violate CP and T, or CP and CPT. The observables based on flavour tag vanish in the limit of vanishing width difference between the physical states, i. e., they need the support of absorptive parts. For the Bd system, where the width difference is negligible, only Re(delta) describing CPT violation and Im (epsilon) describing T violation survive. By studying CP --> flavour transitions of the B mesons we build asymmetries, alternative to those used for kaons, which enable us to test T and CPT invariances of the effective hamiltonian for the Bd system. These alternative CP tags are possible with the entangled states of B factories. In the exact limit in which both physical states have the same width, such asymmetries can be built from the J/Psi KS channel. With a non zero width difference, the expressions have to be corrected and new terms in the asymmetries may cause fake effects of symmetry violation. Genuine T-odd and CPT-odd asymmetries can be constructed combining both J/Psi KS and J/Psi KL channels. They are free of fake effects induced by absorptive parts.. .
Authors:M. C. Banuls, J. Bernabeu
Proposed speaker: J. Bernabeu
Contact person:Jose Bernabeu
(University of Valencia),
Jose.Bernabeu@uv.es
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: M.C.Banuls and J.Bernabeu, Phys. Letters B464 (1999) 117 M.C.Banuls and J.Bernabeu, paper in preparation.
Notes:
The experiment HERA-B is located at DESY(Hamburg) using the 920 GeV proton beam of the HERA accelerator on an internal wire target. The main focus of the experiment is to study CP violating phenomena in B decays. The HERA-B detector, proposed in 1994, has now been fully set up, has entered the commissioning phase and runs routinely under LHC like conditions in terms of radiation load and background conditions. Data are taken with gradually enhanced complexity of the triggering system. This overview talk will summarize the present status of HERA-B as well as the major difficulties on the way until then and attempt to outline the future perspectives of the experiment.
Authors:HERA-B Collaboration
Proposed speaker: Bernhard Schmidt (DESY)
Contact person:Bernhard Schmidt
(DESY),
bernhard.schmidt@desy.de
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
The LHC can be considered as a top-factory, with about 10 million t-tbar events produced in one year of running at low luminosity. This large data set will alllow very precise measurements of the properties of the top quark, which may also reveal New Physics. The mass of the top quark will be measured with a precision of better than 2 GeV. The top quark Yukawa coupling can be determined with a precision of better than 10% for a Higgs mass of about 100 GeV. T-tbar spin correlations can be observed and used to study anomalous couplings or CP violation. Heavy resonances decaying to t-tbar pairs could be detected with masses up to 3 TeV. Rare decays of the top quark can be probed for branching ratios as small as $10^-5$. Finally, the detailed study of three different mechanisms of electroweak single top production will yield a wealth of information, including precision measurements of $V_{tb}$ and of the W and top polarisations, and searches for anomalous couplings.
Authors:ATLAS Collaboration
Proposed speaker:
Contact person:Fabiola Gianotti
(CERN),
fabiola.gianotti@cern.ch
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
Results for inclusive and inelastic J/psi meson production in deep inelastic ep scattering at HERA are presented. The J/psi mesons are identified via the leptonic decay in two electrons or two muons. Compared to previous measurements the kinematical region is extended towards higher values of the four momentum transfer squared Q^2 and hadronic center of mass energy W (gamma-p). In the kinematical range of 2 < Q^2 < 100 GeV^2 and 40 < W gammap < 210 GeV differential and double differential cross sections for inclusive and inelastic production are presented. Theoretical predictions including color singlet and color octet contributions are compared to the data.
Authors:H1 Collaboration
Proposed speaker: An H1 Speaker
Contact person:Peter Schleper
(DESY),
Peter.Schleper@desy.de
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes: (085)
Fermilab fixed target experiment FOCUS collected over one million reconstructed charm mesons during the 1996-1997. Results on D0 mixing and CP violation measurements will be shown.
Authors:Hwanbae Park (FOCUS Collaboration)
Proposed speaker: Hwanbae Park
Contact person:Hwanbae Park
(Korea University),
hbpark@hep.korea.ac.kr
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:This is replacing abstracts 839, 768 and 537.
The SELEX experiment (E781) at Fermilab has the unique capability to compare charm hadroproduction in the forward hemisphere by $\Sigma^-$, p and $\pi$ beams. Results will be presented for the relative differential cross sections $d\sigma/dx_{F}$ of charm particle and antiparticles along with the associated particle/antiparticle asymmetry versus $x_F$ and $p_T$. Data were taken in the same spectrometer at the same time for the charm mesons $D^0$, $D^{\pm}$, and $D_s$ as well as the $\Lambda_c$ baryon. Systematic errors from trigger and background conditions have been investigated and are seen to be small.
Authors:The SELEX Collaboration
Proposed speaker:
Contact person:J. S. Russ
(Carnegie Mellon University),
russ@cmphys.phys.cmu.edu
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:6/13/00 TY-Entered by hand, which was sent to the conveners.
The SELEX experiment (E781) at Fermilab has measured the lifetimes of the charm species $D^0$, $D_s$, and $\Lambda_c^+$ with precision comparable to the best existing measurements. Proper time resolution is typically less than 20 fs. Strong particle identification cuts on the Ring-Imaging Cerenkov tags make particle-misidentification backgrounds very small. The methodology and systematic errors are quite different from other recent experiments, and comparative results will be discussed.
Authors:The SELEX Collaboration
Proposed speaker:
Contact person:J. S. Russ
(Carnegie Mellon University),
russ@cmphys.phys.cmu.edu
Sessions: PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
End of abstracts for PA-07 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )