The study of the decays of the f0(1370), f0(1500) and f0(1710) to pipi, kk, eta eta and eta eta prime will be presented. The determination of their branching ratios allows a study of their glueball and qqbar content to be made.
Authors:WA102 collaboration
Proposed speaker: Andrew Kirk
Contact person:Andrew Kirk
(Birmingham University),
Andrew.Kirk@cern.ch
Sessions: PA-01 Hadron Spectroscopy ( Light and Heavy Quarks, Glueballs, Exotics ) /
Supporting papers:
Notes:
A study of the azimuthal angle phi, which is the angle between the pt vectors of the two outgoing protons, shows that the Pomeron acts as a non-conserved vector current. In this talk we explain the phi dependencies for mesons with JPC = 0-+, 1++ and 2-+. For the 0++ and 2++ sector there is a systematic behaviour in the data that appears to distinguish between qqbar states and glueball candidates.
Authors:WA102 collaboration
Proposed speaker: Andrew Kirk
Contact person:Andrew Kirk
(University of Birmingham),
Andrew.Kirk@CERN.ch
Sessions: PA-01 Hadron Spectroscopy ( Light and Heavy Quarks, Glueballs, Exotics ) /
Supporting papers:
Notes:
The KTeV experiment at the Fermi National Accelerator Laboratory has identified over 900 neutral Cascade Beta Decays during the 1997 fixed target run. We present the first measurement of the vector (f1), axial vector (g1), weak magnetism (f2) and weak electricity (g2) form factors for this decay using the decay rate, the e-nu correlation, and the observed polarization of the Sigma-plus via its two body decay into a proton and neutral pion. In addition, first results on the muonic decay mode and new results on the radiative decay mode (neutral Cascade into neutral Sigma and gamma) will be presented.
Authors:KTeV Collaboration
Proposed speaker: Roland Winston
Contact person:Roland Winston
(The University of Chicago),
winston@rainbow.uchicago.edu
Sessions: PA-01 Hadron Spectroscopy ( Light and Heavy Quarks, Glueballs, Exotics ) /
Supporting papers:
Notes:Dear Dr. E.Takasugi >> I have accepted the nomination of Prof. Roland Winston >> to take Prof. Frisch's place as a delegate from U. Chicago. >> His personal information is appended below. >> Best regards, >> Vera Luth Dear Professor Luth > We will send him the invitation letter soon. >Thank you. E.Takasugi Organization committee
From 4 million hadronic Z0 decays recorded by OPAL, we select a sample of more than 570,000 inclusively reconstructed B mesons. B* mesons are reconstructed using the decay B* --> B gamma. Orbitally excited mesons B*_J are reconstructed in the B* pi and B pi final states. The selected B* candidates are used to obtain samples enriched and depleted in the decay B*_J --> B* pi, from which we perform the first measurement of the branching ratio Br(B*_J->B* pi).
Authors:The OPAL collaboration
Proposed speaker:
Contact person:David J Miller
(CERN),
dave.miller@cern.ch
Sessions: PA-01 Hadron Spectroscopy ( Light and Heavy Quarks, Glueballs, Exotics ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: OPAL PN400 = http://opal.web.cern.ch/Opal/pubs/physnote/html/pn400.html
Notes:Also Parallel session 7, Heavy Quarks
We present new results for rare decays of the neutral Xi^0 hyperon. Using the data collected with the NA48 detector in a special high intensity run end of 1999, we measured the branching fraction and the decay asymmetry of the radiative decay Xi^0 -> Lambda gamma. The sign of the asymmetry has been unambiguously determined. In addition, we report on a new measurement of the Xi^0 semileptonic branching fraction and we present a new upper limit for the Delta S = 2 decay Xi^0 -> p pi-.
Authors:NA48 Collaboration
Proposed speaker: Rainer Wanke
Contact person:Rainer Wanke
(Universität Mainz),
Rainer.Wanke@uni-mainz.de
Sessions: PA-01 Hadron Spectroscopy ( Light and Heavy Quarks, Glueballs, Exotics ) / PL-04 Flavor Dynamics
Supporting papers:
Notes:The sessions, PA-01 and PL-04 are the second choice. The first choice are in abstract #135 (PA-06and PL-02. 4/21/00 Taku-based on E-mail from R.Wanke dated 4/20.
The \eta' which is an SU(3)_F singlet state can contain a pure gluon component, gluonium. We examine this possibility by analysing all available experimental data. It is pointed out that the \eta' gluonic component may be as large as 26%. We also show that the amplitude for J/\psi -> \eta' \gamma decay obtains a notable contribution from gluonium in some cases.
Authors:Emi KOU
Proposed speaker: Emi KOU
Contact person:Emi Kou
(Nagoya Univ.),
kou@eken.phys.nagoya-u.ac.jp
Sessions: PA-01 Hadron Spectroscopy ( Light and Heavy Quarks, Glueballs, Exotics ) /
Supporting papers:
Notes:
DIRAC is collecting data at CERN for its second year. Results from a recent analysis of 1999 data and preliminary results from the current 2000 run will be presented. The goal for this year is to measure the lifetime of pi+pi- atoms with 20% accuracy which corresponds to 10% accuracy on the determination of the difference between the isoscalar and isotensor S-wave pi-pi scattering lengths. An accuracy level allowing to test most recent theoretical predictions formulated in the contest of Chiral Perturbation Theory is expected with the data of 2001.
Authors:DIRAC Collaboration at CERN
Proposed speaker: Armando LANARO
Contact person:Armando Lanaro
(CERN - INFN Laboratori Nazionali di Frascati),
armando.lanaro@cern.ch
Sessions: PA-01 Hadron Spectroscopy ( Light and Heavy Quarks, Glueballs, Exotics ) /
Supporting papers:
Notes:
Data taken with the ALEPH detector at LEP1 have been used to search for gamma gamma production of the glueball candidates f0(1500) and fJ(1710) via their decay to pi+pi-. No signal is observed and upper limits to the product of gamma gamma width and pi+pi- branching ratio of the f0(1500) and the fJ(1710) have been measured to be Gamma_(gamma gamma -> f0(1500)). BR(f0(1500)->pi+pi-) < 0.31 keV and Gamma_(gamma gamma -> fJ(1710)). BR(fJ(1710)->pi+pi-) < 0.55 keV at 95% confidence level.
Authors:ALEPH collaboration
Proposed speaker:
Contact person:Fabrizio Palla
(CERN),
Fabrizio.Palla@cern.ch
Sessions: PA-01 Hadron Spectroscopy ( Light and Heavy Quarks, Glueballs, Exotics ) / PL-12 Soft Interaction Processes ( Low Q2 : diffraction, two-photon and spin structure )
Supporting papers: CERN EP 99-153
Notes:
The KTeV experiment at the Fermi National Accelerator Laboratory has identified over 900 neutral Cascade Beta Decays during the 1997 fixed target run. We present the first measurement of the vector (f1), axial vector (g1), weak magnetism (f2) and weak electricity (g2) form factors for this decay using the decay rate, the e-nu correlation, and the observed polarization of the Sigma-plus via its two body decay into a proton and neutral pion. In addition, first results on the muonic decay mode and new results on the radiative decay mode (neutral Cascade into neutral Sigma and gamma) will be presented.
Authors:KTeV Collaboration
Proposed speaker: Roland Winston
Contact person:Roland Winston
(The University of Chicago),
winston@rainbow.uchicago.edu
Sessions: PA-01 Hadron Spectroscopy ( Light and Heavy Quarks, Glueballs, Exotics ) / PL-04 Flavor Dynamics
Supporting papers:
Notes:I submitted this abstract earlier, before receiving my ID Number: 2586. I am resubmiting it to make sure it is properly registered. I arrive in Osaka July 27, 4:15 PM and will stay for the entire conference.
The results of study of the reaction $e^+e^-\to \phi \to \pi^0\eta\gamma$ SND detector at $e^+e^-$ collider VEPP-2M are presented. The experimental sample of $2\cdot10^7$ produced $\phi$-mesons was used in data analisys. The branching ratio of the $\phi\to\pi^0\eta\gamma$ decay was measured: $B(\phi\to\pi^0\eta\gamma) = (0.88 \pm 0.14 \pm 0.09)10^{-4}$. Significant contribution of the $a_0(980)\gamma$ intermediate state was observed in this decay.
Authors:SND
Proposed speaker: E.V.Pakhtusova
Contact person:Elena V. Pakhtusova
(BudkerINP),
pakhtusova@inp.nsk.su
Sessions: PA-01 Hadron Spectroscopy ( Light and Heavy Quarks, Glueballs, Exotics ) / PL-02 CP Violation and Rare Decays ( Kaon, Muon )
Supporting papers:
Notes:
We discuss the decays X^* -> Xe^+e^- (``Dalitz decays'') of excited heavy mesons into their ground states and an electron-positron pair. We argue that the measurement of the invariant mass spectrum of the lepton pair gives clear indication on the quantum numbers of the excited meson and thus provides an experimental test of the quark model predictions.
Authors:G. Eilam and F. Krauss
Proposed speaker: Gad Eilam
Contact person:Gad Eilam
(Technion-Israel Institute of Technology),
eilam@physics.technion.ac.il
Sessions: PA-01 Hadron Spectroscopy ( Light and Heavy Quarks, Glueballs, Exotics ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:1) Appeared as: hep-ph/0003080. 2) Accepted for publication in Phys. Lett. B.
The explicit expressions for electric, magnetic, axial and pseudoscalar form factors of the nucleon have been derived analytically. Contrary to the semiclassical case canonical quantization procedure of SU(2) Skyrme model ensure existence of stabile quantum soliton (nucleon). Only two model parameter $f_\pi$ and $e$ are fixed from nucleon mass 926 MeV and proton electric square radius 0.735 $fm^2$. Static properties and form factors are calculated using only these two parameters. We enclose relativistic corrections and compare theoretical and experimental values. The dependance of form factors expressions on SU(2) representation is discussed.
Authors:E. Norvaisas, A. Acus ITPA, Vilnius, Lithuania and D.O. Riska Dep. Phys., Univ. Helsinki, Finland
Proposed speaker: E. Norvaisas
Contact person:Egidijus Norvaisas
(Institute of Theoretical Physics and Astronomy),
norvaisas@itpa.lt
Sessions: PA-01 Hadron Spectroscopy ( Light and Heavy Quarks, Glueballs, Exotics ) / PL-07b Search for New Particles and New Phenomena (Results from Hadron Colliders)
Supporting papers: A. Acus, E. Norvaisas and D.O. Riska, Phys. Rev. C 57,(1998) 2597.
Notes:
The KLOE detector at DAFNE, the Frascati Phi-factory, has collected about 8 millions phi decays in 1999. Measurements of Phi decays into pi0, eta, eta', f0(980), a0(980) and pi+pi-pi0 have been performed with statistical accuracy better than previously in a single detector, as well as new decay modes. Phi radiative decays can clarify the nature of f0 and a0 (are they 4 quark states?) and measure the eta-eta' mixing angle. Analysis of pi+pi-pi0 final state allows us to extract the possible existence of direct decay in addition to the dominant rho-pi mode and to obtain a precise measurement of the rho parameters such as the mass difference between the charged and neutral rho, previously never seen.
Authors:The KLOE collaboration
Proposed speaker: Antonella Antonelli
Contact person:Juliet Lee-Franzini (ICHEP ID 1790)
(INFN-Laboratori Nazionali di Frascati),
juliet.leefranzini@lnf.infn.it
Sessions: PA-01 Hadron Spectroscopy ( Light and Heavy Quarks, Glueballs, Exotics ) / PL-12 Soft Interaction Processes ( Low Q2 : diffraction, two-photon and spin structure )
Supporting papers: 5/12/00 TY-Moved from PL7a to PL12
Notes:
Evidences for the existence of a dynamical gluon mass scale are presented, and an expression for this mass, obtained through an effective potential for composite operators, is used to computo gluon mass corrections in heavy quarkonia decays. We show that the effects of dynamical gluon masses are negligible for Upsilon decay but important for J/Psi decay.
Authors:A.A.Natale
Proposed speaker: A.A.Natale
Contact person:Adriano A. Natale
(Univ. Estadual Paulista),
natale@ift.unesp.br
Sessions: PA-01 Hadron Spectroscopy ( Light and Heavy Quarks, Glueballs, Exotics ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: A.Mihara and A.A.Natale, hep-ph/0004236 (to appear in Phys.Lett.B) E.V.Gorbar and A.A.Natale, Phys. Rev. D61 (2000) 054012.
Notes:
Using data recorded by the CLEO II and CLEO II.V detectors at CESR, we present a new measurement of the mass of the Sigma_c^+ charmed baryon, observed by its decay into Lambda_c^+,pi^0, and the first observation of a new state with a mass around 230 MeV above the Lambda_c^+. This new state is identified as the J^P=(3/2)^+ Sigma_c^*+, the isospin partner of the previously discovered Sigma_c^++ and Sigma_c^0.
Authors:CLEO
Proposed speaker: CLEO
Contact person:David E Jaffe
(Cornell University),
cleoac@mail.lns.cornell.edu
Sessions: PA-01 Hadron Spectroscopy ( Light and Heavy Quarks, Glueballs, Exotics ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
Using data recorded by the CLEO II and CLEO II.V detectors at CESR, we report new measurements of the Sigma_c^++ and Sigma_c^0 masses, and the first measurements of their intrinsic widths. The measured widths of these particles agree with the theoretical predictions.
Authors:CLEO
Proposed speaker: CLEO
Contact person:David E Jaffe
(Cornell University),
cleoac@mail.lns.cornell.edu
Sessions: PA-01 Hadron Spectroscopy ( Light and Heavy Quarks, Glueballs, Exotics ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
The reaction gamma gamma --> pi+ pi- pi+ pi- has been studied with the L3 detector at LEP. The data sample used corresponds to a total integrated luminosity of 410 pb-1 collected at the centre-of-mass energies from 189 GeV to 202 GeV. In the four-pion invariant mass region below 2 GeV/c2 the process is dominated by rho0 rho0 production. A spin-parity analysis shows a dominance of the two-photon helicity state (JP,J_z)=(2+,2) with the small admixture from JP=0+. The contribution of the negative parity states is consistent with zero.
Authors:L3 Collaboration
Proposed speaker: L3 speaker
Contact person:Simonetta Gentile
(CERN),
Simonetta.Gentile@cern.ch
Sessions: PA-01 Hadron Spectroscopy ( Light and Heavy Quarks, Glueballs, Exotics ) / PL-12 Soft Interaction Processes ( Low Q2 : diffraction, two-photon and spin structure )
Supporting papers:
Notes:in preparation
The K0_S, K+-pm pi-+ and eta,pi+pi- final states in two-photon collisions are studied with the L3 detector at LEP using data collected at centre-of-mass energies from 183 to 202 GeV. The mass spectrum of the K0_S, K+-pi-+ final state is analyzed from threshold to 2 GeV. A peak in the mass spectrum may be identified with the eta (1440) resonance. This resonance is observed in gamma-gamma collisions for the first time. This state is not observed in the eta,pi+,pi- decay mode. The product of the two-photon width of eta(1440) and the branching ratio to K0_S, K+-pi-+ decay channel is measured and the upper limit of that for eta,pi+pi- decay channel is given. The hypothesis that the eta (1440) is gluonium state is examined.
Authors:L3 Collaboration
Proposed speaker: L3 speaker
Contact person:Simonetta Gentile
(CERN),
Simonetta.Gentile@cern.ch
Sessions: PA-01 Hadron Spectroscopy ( Light and Heavy Quarks, Glueballs, Exotics ) / PL-12 Soft Interaction Processes ( Low Q2 : diffraction, two-photon and spin structure )
Supporting papers:
Notes:in preparation
The K0s K0s final state in two-photon collisions is studied with the L3 detector at LEP using data collected at centre-of-mass energies from 91 GeV to 202 GeV. The mass spectrum is dominated by the formation of the f'_2(1525) tensor meson in the helicity two state. Clear evidence for destructive f_2-a_2 interference is observed. In addition the signal for f_J(1750) is observed. The study of the decay angular distribution of this state favours the spin two assignment. No signal has been observed in the region around 2.2 GeV. An upper limit for the two-photon partial width of the csi(2220) glueball candidate is derived.
Authors:L3 Collaboration
Proposed speaker: L3 speaker
Contact person:Simonetta Gentile
(CERN),
Simonetta.Gentile@cern.ch
Sessions: PA-01 Hadron Spectroscopy ( Light and Heavy Quarks, Glueballs, Exotics ) / PL-12 Soft Interaction Processes ( Low Q2 : diffraction, two-photon and spin structure )
Supporting papers:
Notes:in preparation
The reaction e+e- --->e+e-Lambda-bar(Lambda) is studied with the L3 detector at LEP using data collected at centre-of-mass energies from 91 GeV to 202 GeV. The formation of Sigma0-bar(Sigma)0 is also studied. The cross sections are compared to quark-diquark model predictions.
Authors:L3 Collaboration
Proposed speaker: L3 speaker
Contact person:Simonetta Gentile
(CERN),
Simonetta.Gentile@cern.ch
Sessions: PA-01 Hadron Spectroscopy ( Light and Heavy Quarks, Glueballs, Exotics ) / PL-12 Soft Interaction Processes ( Low Q2 : diffraction, two-photon and spin structure )
Supporting papers:
Notes:in preparation
We report on measurements of the inclusive production rate of Sigma+ and Sigma0 baryons in hadronic Z decays collected with the L3 detector at LEP. The Sigma+ baryons are detected through the decay Sigma+ -> p pi0, while the Sigma0 baryons are detected via the decay mode Sigma0 -> Lambda gamma. The average numbers of Sigma+ and Sigma0 per hadronic Z decay are measured to be: < N_{Sigma+}> + < N_{\bar{Sigma}+}> = 0.114+- 0.011(stat)+- 0.009(syst) < N_{Sigma0}> + < N_{\bar{Sigma}0}> = 0.095+- 0.015(stat)+- 0.013(syst) These rates are found to be higher than the predictions from Monte Carlo hadronization models and analytical parameterizations of strange baryon production.
Authors:L3 Collaboration
Proposed speaker: L3 speaker
Contact person:Simonetta Gentile
(CERN),
Simonetta.Gentile@cern.ch
Sessions: PA-01 Hadron Spectroscopy ( Light and Heavy Quarks, Glueballs, Exotics ) / PL-12 Soft Interaction Processes ( Low Q2 : diffraction, two-photon and spin structure )
Supporting papers: L3 Collab., M. Acciarri et al., Physics letters B Accepted CERN-EP-2000-028; 08 February 2000. L3 preprint 203. Inclusive Sigma+ and Sigma0 Production in Hadronic Z Decays.
Notes:
The recent results of VES-collaboration on the resonances produced in diffractive-like reactions are presented. In the reaction $\pi^- N \to \pi^+ \pi^- \pi^- N$ the parameters of resonances observed at $1.5 GeV < M < 2.2 GeV$ and their branching ratios to different channels are reported. In the reaction $ K^- N \to K^- \pi^+ \pi^- N $ the pseudoscalar state at $M\approx 1.4 GeV$ is clearly seen. At $M\approx 2.1 Gev$ there is the indication on one more pseudoscalar resonance. The parameters of exotic resonance $J^{PC}=1^{-+}$ at $M \approx 1.6 GeV$ in $/etaprim /pi $ and $b_1 \pi$ channels are measured. The energy dependence and t-dependence point to diffractive production mechanism and support the interpretation of this resonance as the hybrid.
Authors:VES-collaboration
Proposed speaker: A.Zaitsev
Contact person:Alexandre M. Zaitsev
(Institute for High Energy Physics),
zaitsev@mx.ihep.su
Sessions: PA-01 Hadron Spectroscopy ( Light and Heavy Quarks, Glueballs, Exotics ) / PL-12 Soft Interaction Processes ( Low Q2 : diffraction, two-photon and spin structure )
Supporting papers:
Notes:
We present data of the E781 (SELEX) experiment on coherent production of the pi+pi-pi- system with 600 GeV/c pi- beam on carbon, copper and lead targets. At small momentum transfers a2(1320) signal is observed. Primakoff formalism is used to extract radiative decay width of this meson.
Authors:E781 (SELEX)
Proposed speaker: V. Molchanov
Contact person:Vladimir V Molchanov
(Fermilab),
molchan@fnal.gov
Sessions: PA-01 Hadron Spectroscopy ( Light and Heavy Quarks, Glueballs, Exotics ) /
Supporting papers:
Notes:Final value of the radiative decay width will be obtained this summer.
Using 3.79 million produced $\psi(2S)$ events collected at BEPC/BES, we report the branching fractions (or upper limits) of the $\psi(2S)$ decays into the hadronic final states of $\omega\pi^+\pi^-, \omega K^+K^-, \omega p\overline{p}$, $\phi\pi^+\pi^-, \phi K^+K^-, \phi p\overline{p}, \phi f_0(980),\pi^0\pi^+\pi^-p\overline{p}, \eta\pi^+\pi^-p\overline{p}$,$ K^*K^-\pi^+ +c.c., K^*\overline{K}^*+c.c., K^*\overline{K_2}^*+c.c.$, the baryon pairs of $ p\overline{p}, \Lambda \overline{\Lambda},\Sigma^0 \overline{\Sigma}^0, \Xi^- \overline{\Xi}^+, \Delta^{++} \overline{\Delta}^{--}, \Sigma^{*-} \overline{\Sigma}^{*+}, \Xi^0(1530)\overline {\Xi}^0(1530), \Omega^- \overline{\Omega}^+$, and the radiative decays of $\psi(2S)\rightarrow \gamma f_2(1270)\rightarrow\gamma \pi \pi, \psi(2S)\rightarrow\gamma f_J(1710)\rightarrow\gamma(\pi \pi, K\overline{K}), \psi(2S)\rightarrow\gamma \chi_{c0,2}\rightarrow\gamma (\pi^0\pi^0,\eta \eta)$. Most of them are measured for the first time. The PQCD 15\% prediction for the ratios of $\psi(2S)$ to $J/\psi$ hadronic decay branching fractions are tested. The strong OZI and DOZI violation with respect to the naive $\omega/\phi$ mixing model for $\psi(2S)$ hadronic decays involving $\omega$ and $\phi$ is observed. The deviations from expectations based on flavor-SU(3) symmetry are presented in baryon pair decays. \par The cross sections for $e^+e^-\rightarrow$ hadrons,$e^+e^-,\mu^+\mu^-,\pi^+\pi^-J/\psi$ have been measured in the vicinity of the $\psi(2S)$ resonance, the preliminary results for $\psi(2S)$ total decay width and partial widths to hadrons,$\mu^+\mu^-,\pi^+\pi^-J/\psi$ together with their branching fractions are also given.
Authors:BES Collaboration
Proposed speaker: Yongsheng Zhu
Contact person:Yongsheng Zhu
(Institute of High Energy Physics),
zhuys@hpws6.ihep.ac.cn
Sessions: PA-01 Hadron Spectroscopy ( Light and Heavy Quarks, Glueballs, Exotics ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:5/15/00 TY-Changed PA-01 ->PA07, PL-07a->PL03. 6/9/00 TK/TY-Changed it back from PA07 to PA01.
FOCUS (FNAL-E831) studies high-energy (170~GeV) photoproduction, decays and spectroscopy of charmed particles. The experiment amply surpassed the goal of collecting ten times its predecessor experiment 687's data set, with significant improvements on data quality. New results on charmed meson spectroscopy are presented, including D* isospin mass splittings, and L=1 excited D** states.
Authors:The FOCUS Collaboration (E831 at Fermilab)
Proposed speaker: Franco L. Fabbri
Contact person:Stefano Bianco
(Laboratori Nazionali di Frascati dell'INFN),
bianco@lnf.infn.it
Sessions: PA-01 Hadron Spectroscopy ( Light and Heavy Quarks, Glueballs, Exotics ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
Focus is a high statistics charm photoproduction experiment performed at Fermilab. The experiment collected very large samples of charmed baryons. We present signals for several baryon states such as $\Lambda_c^+, \Sigma_c^(0,+,++),\Xi_c^(o,+)$. In particular we show the isospin mass splitting and widths of the $\Sigma_c$ particles; the B.R. of the Cabibbo suppressed decay $\Xi_c^+ \to pK\pi$ relative to $\Xi_c^+ \to \Xi^- 2\pi^+$ as well as other decay channels of charmed baryons including excited states.
Authors:FOCUS-E831 Collaboration
Proposed speaker: Sergio P. Ratti
Contact person:Sergio P. Ratti
(Universita' di Pavia),
sergio.ratti@pv.infn.it
Sessions: PA-01 Hadron Spectroscopy ( Light and Heavy Quarks, Glueballs, Exotics ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:paper relevant to session 1 (hadron spectroscopy) as well as session 7 (heavy flavor phyiscs).
We describe recent resonant analyses of charm meson and baryon decays using Fermilab experiment E791 data. The Lambda_c+ -> p K- pi+ decays were studied for the Lambda_c+ polarization and for resonant substructure using a five-dimensional technique. Decays of D+ and D_s+ to pi+ pi- pi+ were studied for resonant substructure. Evidence for a scalar resonance is presented. Finally, we measure some previously less well known mass and width parameters for f0 states using Ds+ decays to 3 three pions.
Authors:Fermilab E791 collaboration
Proposed speaker: Milind Purohit
Contact person:Milind V Purohit
(Univ of S. Carolina),
e791l@scuch8.psc.sc.edu
Sessions: PA-01 Hadron Spectroscopy ( Light and Heavy Quarks, Glueballs, Exotics ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers: ``Multidimensional resonance analysis of Lambda_c --> p K pi'', E. M. Aitala et al., Phys. Lett. B471:449-459, 2000.
Notes:
For the decays of L = 1 baryon excitations, large N_c ideas show that two-body operators for the decays are not suppressed. Nonetheless, one-body operators alone give a good description of the data. We will review how these results are obtained, and shown how new (but accessible at CEBAF) decay channels can provide a nontrivial test of the lowest order large N_c predictions. Further using what we have learned, we will make model independent predictions for the decays of the radially excited L = 0 baryons, under the assumptions that the one-body operators dominate, and neglecting configuration mixing.
Authors:Carl E. Carlson and Christopher D. Carone
Proposed speaker: Carl E. Carlson
Contact person:Carl E Carlson
(College of William and Mary),
carlson@physics.wm.edu
Sessions: PA-01 Hadron Spectroscopy ( Light and Heavy Quarks, Glueballs, Exotics ) / PL-12 Soft Interaction Processes ( Low Q2 : diffraction, two-photon and spin structure )
Supporting papers: one in preparation; Phys.Rev.D59:114008,1999; Phys.Lett.B441:363-370,1998 ; Phys.Rev.D58:053005,1998
Notes:
The spectroscopic study of charmed baryons has produced many results in the last few years. The quark model predicts many excited states of Lambda_c and Sigma_c baryons, some of which cannot, because of quantum mechanical conservations rules, decay via one pion to the ground state. We present results of a search, using the CLEO detector operating at the Cornell Electron Storage Rings, for such states decaying via dipion decays into the ground state Lambda_c^+
Authors:CLEO
Proposed speaker: CLEO
Contact person:David E Jaffe
(Cornell University),
cleoac@mail.lns.cornell.edu
Sessions: PA-01 Hadron Spectroscopy ( Light and Heavy Quarks, Glueballs, Exotics ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
Recently, the CLEO collaboration reported the existance of a pair of excited Xi_c particles decaying into Xi_c^* pi. These are thought to be orbitally excited Xi_c's with J^P=3/2^-. Here, using the complete CLEO II and CLEO II.V datasets, we present here a search for the analagous J^P = 1/2^- particles, which are predicted to decay into Xi_c^prime pi.
Authors:CLEO
Proposed speaker: CLEO
Contact person:David E Jaffe
(Cornell University),
cleoac@mail.lns.cornell.edu
Sessions: PA-01 Hadron Spectroscopy ( Light and Heavy Quarks, Glueballs, Exotics ) / PL-03 Heavy Flavor Physics ( Charm, Bottom, Top and Tau )
Supporting papers:
Notes:
The KLOE detector at DAFNE, the Frascati Phi-factory, has collected about 8 millions phi decays in 1999. Measurements of Phi decays into pi0, eta, eta', f0(980), a0(980) and pi+pi-pi0 have been performed with statistical accuracy better than previously in a single detector, as well as new decay modes. Phi radiative decays can clarify the nature of f0 and a0 (are they 4 quark states?) and measure the eta-eta' mixing angle. Analysis of Phi->pi+pi-pi0 allows us to extract the possible existence of direct decay in addition to the dominant rho-pi mode and to obtain a precise measurement of the rho parameters such as the mass difference between the charged and neutral rho, previously never seen.
Authors:The KLOE collaboration
Proposed speaker: A. Antonelli
Contact person:Juliet Lee-Franzini (ICHEP ID 1790)
(INFN-Laboratori Nazionali di Frascati),
Juliet.leefranzini@LNF.INFN.IT
Sessions: PA-01 Hadron Spectroscopy ( Light and Heavy Quarks, Glueballs, Exotics ) / PL-12 Soft Interaction Processes ( Low Q2 : diffraction, two-photon and spin structure )
Supporting papers:
Notes:(010) 5/12/00 TY-Moved from PL7a to PL12
Baryons containing two heavy quarks are treated in the Born-Oppenheimer approximation. Schr\"odinger equation for two center Coulomb plus harmonic oscillator potential is solved by the method of ethalon equation at large intercenter separations. Asymptotical expansions for energy term and wave function are obtained in the analytical form. Using those formulas, the energy spectra of doubly heavy baryons with various quark compositions are calculated analytically.
Authors:D. U. Matrasulov (Uzbek Academy of Sci), M. Musakhanov (Uzbekistan National University), T. Morii (Kobe University)
Proposed speaker: M. Musakhanov
Contact person:Mirzayusuf Musakhanov
(Uzbekistan National University),
yousuf@iaph.silk.org
Sessions: PA-01 Hadron Spectroscopy ( Light and Heavy Quarks, Glueballs, Exotics ) / PL-07b Search for New Particles and New Phenomena (Results from Hadron Colliders)
Supporting papers:
Notes:published at Phys.Rev.C61(2000)045204, hep-ph/0004147. (012) Just specified PL-07.
CMD-2 detector has collected about 30 pb-1 at VEPP-2M e+e- collider in the 0.36-1.4 GeV energy range. New physics results are presenting: 1. Hadron cross section measurements in the pi+pi-, pi+pi-pi0, pi+pi-pi0pi0, pi+pi-pi+pi-, omegapi+pi-, etapi+pi-, K+K-, KSKL final states. These measurements are performed with less than 1% systematic errors and improved accuracy of the hadron contribution to g-2 of muon. New strustures associated with Omega(1200-1400) has been observed in 3pi final state. 2. Study of the Rho, Omega and Phi resonancies: a. New precision measurements of Omega and Phi parameters have been performed. b. Rare decays of Rho, Omega and Phi have been studied in the pi0pi0gamma, pi+pi-gamma, eta gamma, etaprime gamma, pi0 gamma, pi-pi-pi+pi-, omegapi0, eta e+e- final states. 3. The dynamic of multipion production was studied in 4pi and 5pi final states. The dominance of A1pi for 4 pion production has been shown. The Omega pipi and eta pipi final states dominate for 5pi production.
Authors:CMD-2 collaboration
Proposed speaker: prof. Evgeny Solodov
Contact person:Evgeny P Solodov
(Budker Institute of Nuclear Physics),
solodov@inp.nsk.su
Sessions: PA-01 Hadron Spectroscopy ( Light and Heavy Quarks, Glueballs, Exotics ) / PL-12 Soft Interaction Processes ( Low Q2 : diffraction, two-photon and spin structure )
Supporting papers:
Notes:(026) Just specified PL-07. 5/11/00 TY-Switched from PL07a to PL-12.
The production of $K^+K^-$ pairs in two-photon collisions has been measured with the Belle detector at KEKB. We require a ``no-tag" condition, where neither the recoil $e^+$ nor $e^-$ is detected, and transverse-momentum balance for the $K^+K^-$ pair in order to restrict the incident photons to small virtuality. The Belle detector's excellent particle identification capability is used to distinguish kaon pairs from a large background of electron, muon and pion pairs. We report the energy dependence of the cross section for $\gamma\gamma\to K^+ K^-$ over the c.m. energy range between 1.3 and 2.3 GeV. Contributions of existing and postulated meson resonances are examined.
Authors:Belle collaboration
Proposed speaker: Sadaharu Uehara
Contact person:Hiroaki Aihara
(University of Tokyo),
aihara@phys.s.u-tokyo.ac.jp
Sessions: PA-01 Hadron Spectroscopy ( Light and Heavy Quarks, Glueballs, Exotics ) / PL-01b New Results from e+e- B-factories : BELLE
Supporting papers:
Notes:5/18/00 TK/TY-Moved from PA-02 to PA-01.
New measurements of peripherial meson production in pion-proton collisions are presented. A partial wave analysis of eta pi+ pi- pi- decays shows significant strength in several exotic (Jpc=1-+) waves.
Authors:Brookhaven National Laboratory Experiment 852
Proposed speaker: Jingliang Hu
Contact person:Gary S Adams
(Rensselaer Polytechnic Institute),
adamsg@rpi.edu
Sessions: PA-01 Hadron Spectroscopy ( Light and Heavy Quarks, Glueballs, Exotics ) / PL-12 Soft Interaction Processes ( Low Q2 : diffraction, two-photon and spin structure )
Supporting papers:
Notes:
Using 3.8 million produced psi(2S) events collected at BEPC/BES, we report the branching fractions (or upper limits) for psi(2S) radiative decays, hadronic decays and baryon pairs final states. Most of the branching fractions are measured for the first time. The PQCD 15% prediction for the ratios of psi(2S) to J/psi hadronic decay branching fractions are tested. The prediction of flavor- SU(3) symmetry for psi(2S) baryon pair decays is compared with BES data. Using 7.8 million produced J/psi events together with above psi(2S) data sample, we determine the mass and full-width of the eta_c meson. Recent progress on charmonium decays from BESII (the upgraded BES detector) are presented, including the measurement of psi(2S) total decay width and partial widths to mu+mu-,pi+pi-J/psi final states by the scan experiment in the vicinity of the psi(2S) resonance, and the inclusive gamma spectrum of the J/psi radiative decay with newly collected 22 million J/psi data sample by means of photon conversion method.
Authors:Yongsheng Zhu (representing BES Collaboration)
Proposed speaker: Yongsheng Zhu
Contact person:Yongsheng Zhu
(Institute of High Energy Physics),
zhuys@hpws6.ihep.ac.cn
Sessions: PA-01 Hadron Spectroscopy ( Light and Heavy Quarks, Glueballs, Exotics ) / PL-07a Search for New Particles and New Phenomena (Results from e+e- Colliders)
Supporting papers:
Notes:
End of abstracts for PA-01 Hadron Spectroscopy ( Light and Heavy Quarks, Glueballs, Exotics )