[ICHEP Home]


PA-04 High Energy Heavy Ion Collisions

There are 24 abstracts for this session.


63. Heavy Ion Physcis with Compact Muon Solenoid at LHC

The Compact Muon Solenoid (CMS) is the general purpose detector designed to run at the LHC and optimized mainly for the search of the Higgs boson in proton-proton collisions. However, a good muon system and electromagnetic and hadron calorimeters with fine granularity gives the possibility to cover several important aspects of the heavy ion physics. In particular, the production of heavy quarkoniums Upsilon, Upsilon', Upsilon'' through their muon decay channel and the energy losses of hard quark- and gluon-initiated jets, are valuable processes for studying the phase transition from the hadronic matter to the plasma of deconfined quarks and gluons in central nucleus-nucleus collisions. Such strong-interacting objects ("hard probes") are created at the initial phase of the nuclei collision and propagate through the dense matter carrying information about its state. Sensitivity of the "hard probes" measurements (high mass dimuons production and calorimetric studies of jet+jet, gamma+jet and Z+jet channels) in heavy ion collisions with the CMS detector system are reviewed. Z (--> mu+mu-) production will be also detected in heavy ion collisions and can be used as reference process for understanding conventional nuclear effects. Transverse energy deposition in barrel, endcup and very forward parts of the CMS calorimeters are expected to be correlated with decreasing impact parameter of nucleus-nucleus collision, thus giving us a tool to measure the centrality of the collision and select the most central interaction events with the off-line ET trigger.

Authors:CMS
Proposed speaker: L.I.Sarycheva
Contact person:Ludmila I. Sarycheva (M.V.Lomonosov Moscow State University ), lis@alex.npi.msu.su

Sessions: PA-04 High Energy Heavy Ion Collisions /

Supporting papers:

Notes:


83. Unisotropic color superconductor

It is demonstrated that theoretically acceptable rotationally invariant effective Lagrangian of deconfined QCD matter at finite density can describe an unisotropic color superconductor: Dispersion laws of its quark excitations, and the properties of soft Nambu-Goldstone modes which manifest the spontaneous breakdown of the rotational invariance are given explicitly.

Authors:Jiri Hosek
Proposed speaker: Jiri Hosek
Contact person:Krishna Rajagopal (Massachusetts Institute of Technology), krishna@cpt.mit.edu

Sessions: PA-04 High Energy Heavy Ion Collisions / PL-15 High Energy Heavy Ion Collisions

Supporting papers: Jiri Hosek, Macroscopic quantum phases of a deconfined QCD matter at finite density, hep-ph/9812516, Phys.Rev.D, to be published

Notes:


84. Multi-Strange Particle Enhancements in Pb-Pb Interactions at 158 GeV/c per Nucleon

The results from WA97 on enhancement of strange and multi-strange baryon and anti-baryon yields in central Pb-Pb collisions represent some of the best evidence for a new phase of matter being formed in these collisions. We find that Xis are enhanced more than Lambdas and Omegas are enhanced even more than Xis. The Omegas, themselves, are enhanced by about a factor of fifteen. These results are difficult to explain using normal hadronic models but are expected in models where a phase transition into a Quark-Gluon Plasma occurs. In this paper, we will present the lastest results from WA97 on strange and multi-strange particle production. Transverse mass distributions of these particles will also be presented.

Authors:The WA97 Collaboration
Proposed speaker: David Evans
Contact person:David Evans (University of Birmingham), d.evans@bham.ac.uk

Sessions: PA-04 High Energy Heavy Ion Collisions / PL-15 High Energy Heavy Ion Collisions

Supporting papers:

Notes:


261. Nuclear matter jets and the internal structure of the particle source in relativistic nuclear collisions

The global analysis has been used for studying the hydrodynamic behaviour of the nuclear matter formed by nucleus-nucleus collisions at 4.5 A GeV/c and nuclear matter jets have been evidenced in such collisions [1,2]. New and interesting information on the collision dynamics has been obtained [3]. The sphericity and thrust tensors have been used in a non-hierarchic method for cluster formation studies. A great number of events in He-AT and C-AT collisions at 4.5 A GeV/c presents a jet structure [1,2]. The events without a jet structure (non-jet events) are associated with the shock wave formation [4] Previous hypotheses and results suggested that the particle sources formed in relativistic nuclear collisions present an internal structure [5-7]. Therefore, in the work new arguments and experimental evidences for proving the existence of a internal structure of the particle sources formed in He-AT collisions at 4.5 A GeV/c are considered. Many are related to the nuclear matter jet structure evidenced in these collisions. These new results sustain the competition among different particle production mechanisms in nucleus-nucleus collisions at 4.5 A GeV/c, as well as the connections between the collision geometry and collision dynamics [3,6].

Authors:Alexandru JIPA, Calin BESLIU, Dan ARGINTARU, Cristina ARGINTARU
Proposed speaker: Alexandru JIPA
Contact person:Alexandru JIPA (Faculty of Physics, University of Bucharest), ajip@scut.fizica.unibuc.ro; aljipa@hotmail.com

Sessions: PA-04 High Energy Heavy Ion Collisions / PL-15 High Energy Heavy Ion Collisions

Supporting papers: [1]. C.Besliu et al - European Physicsl Journal A1(1998)65 [2]. D.Argintaru - Ph.D.Thesis, University of Bucharest, Faculty of Physics, 1999 [3]. C.Besliu et al - Nucl.Phys.A669(2000) - in press [4]. Cristina Argintaru - Ph.D.Thesis, University of Bucharest, Faculty of Physics, 2000 [5]. S.Biyajima et al Phys.Lett.B496(1996) [6]. Al.Jipa, C.Besliu, M.Iosif, R.Zaharia - Il Nuovo Cimento A112(1999)179 [7]. Al.Jipa - International Europhysics Conference on High Energy Physics, 15-21 July 1999, Tampere, Finland - abstract number 14-657

Notes:


306. Possible schock wave signatures in He-AT and C-AT reactions at 4.5 A GeV/c

Previous exeprimental results on the negative pion production in He-AT and C-AT reactions at 4.5 A GeV/c at 4.5 A GeV/c (nuclear stopping [1], nuclear matter flow [2], cumulative effect [3], existence of the nuclear matter jets [4], competition among particle production mechanisms [5]) suggest, as a possible primary excitation mechanism, the presence of the shock wave. The present work is an attempt to find the shock wave signatures considering the Burger's and de Vries equations deduced in classical hydrodynamics, extended for nuclear fluid [6-8]. Using a polar representation for the mathematical solutions, correlations among the detected and predicted maxima in the negative pion angular distributions and their associated velocities were checked. Two polar shock waves associated with dispersion and viscosity were determined. The obtained results are compared with the thrust angles and the coherence degree for the negative pion emission related to the shock wave front. Nuclear matter jets production in connection with the Mach's cone for the nuclear shock wave is analysed, too. Important conclusions on the collision geometry and different hydrodynamic behaviours of the nuclear matter are obtained.

Authors:C.Besliu, Al.Jipa, Cristina Argintaru, D.Argintaru, V.Cartas, D.Felea, Cl.Grigorie, Nicoleta Ioneci Sarbu, R.Zaharia, I.S.Zgura
Proposed speaker: Alexandru JIPA
Contact person:Alexandru JIPA (Faculty of Physics, University of Bucharest), ajip@scut.fizica.unibuc.ro; aljipa@hotmail.com

Sessions: PA-04 High Energy Heavy Ion Collisions / PL-15 High Energy Heavy Ion Collisions

Supporting papers: [1].Al.Jipa, C.Besliu, R.Zaharia, A.M.David-J.Phys.G: Nucl.Part.Phys.22(1996)221 [2].C.Besliu et al-Proceedings of the International Conference "Large Scale Collective Motion of Atomic Nuclei" (Editors: G.Giardina, G.Fazio, M.Lattuada)-World Scientific, Singapore, New Jersey, London, Hong Kong, 1997, pages 307-317 [3].Al.Jipa, C.Besliu, Maria Iosif, R.Zaharia-Il Nuovo Cimento A112(1999)179 [4].C.Besliu et al-European Physical Journal A1(1998)65 [5].C.Besliu et al-Nuclear Physics A669(2000) - in press [6].A.Lichnerowicz-Hydrodynamics and Magnetohydrodynamics-Benjamin Inc, New York, 1967 [7].L.Landau, E.Lifchitz-MIR Publishing, Moscow, 1983 [8].W.Burger-Physical Review C47(1993)

Notes:


309. Droplets in particle source formed in relativistic nuclear collisions

The identical particle interferometry is used for estimating the space-time characteristics of the particle source formed in in relativistic nuclear collisions; the method offers information on the existence of some correlations in the second order among the particle pairs, too [1,2]. Different experimental results on the chaos parameter have been reported. Some connections with the possible internal structure of the particle source [3]. For giving additional support of the existence of a such structure (quark-gluon plasma droplets in hadronic plasma, for example) in this work the "free space" probability - P(0) = exp[-gc(1-g)], with g and c free parameters - is considered to estimate the nuclear matter behaviour around the droplet [4]. Some connections among the chaos parameters in droplets and the chaos parameter of the source are presented. Possibile comparisons with experimental results and simulations are included.

Authors:Al.Jipa, C.Besliu, R.Marginean, R.Zaharia, I.S.Zgura, D.Felea
Proposed speaker: Alexandru JIPA
Contact person:Alexandru JIPA (Faculty of Physics, University of Bucharest), ajip@scut.fizica.unibuc.ro; aljipa@hotmail.com

Sessions: PA-04 High Energy Heavy Ion Collisions / PL-15 High Energy Heavy Ion Collisions

Supporting papers: [1].M.Pluemer, S.Raha, R.M.Weiner (editors) - Proceedings of the International Workshop on Correlations and Multiparticle Production - World Scientific, Singapore, New Jersey, London, Hong Kong, 1991 [2].Al.Jipa - J.Phys.G: Nucl.Part.Phys.22(1996)231 [3].Al.Jipa - PANIC'99, Lund, Sweden, 1999 [4].Ding-wei Huang - J.Phys.G: Nucl.Part.Phys.23(1997)895

Notes:


315. Features of He beam and He daughters at Dubna energy

This investigation deals with the main characteristics of the interactions of 3 He beams, primary and daughters of 32S and 6Li at 3.7 AGeV, with emulsion, light (CNO), and heavy (AgBr) nuclei. The experimental interaction cross sections with a particular target are nearly unchangeable. The experimental data are compared with those according to the formula pf Pradt-Peter and the Glauber approach. The multiplicity distributions as well as the average values of the various secondary particles are studied and discussed.

Authors:M.El-Nadi, M.S. El-Nagdy, A. AbdelSalam, E.A. Shaat, N.Ali Mossa, Z. Abou Moussa, N. Rashed, S. Kamel, M.A. Fayed
Proposed speaker: M.S. El-Nagdy
Contact person:M.S. El-Nagdy (Helwan University), khelwagd@frcu.eun.eg

Sessions: PA-04 High Energy Heavy Ion Collisions / PL-15 High Energy Heavy Ion Collisions

Supporting papers:

Notes:6/10/00 TY-Fixed last name


316. Central events in the interactions of 28Si and 32S with heavy emulsion targets

Data on the multiplicity of secondaries in central events of 28Si (14.6 AGeV) and 32S (3.7 AGeV) interactions with AgBr emulsion nuclei have been compiled and studied. The dependence of the centrality on the target size as well as on the outgoing charged secondaries (with and without the appearence of projectile charged stripping particles) are investigated. The resultant multiplicity distribution of the produced pions for each studied case is fitted by both Negative Binomial (NB) and Poission distributions. The NB distribution is valid for most of the considered cases. The transparency of the target for a projectile was founf to become more pronounced as the incident energy increases.

Authors:M.El-Nadi, M.S. El-Nagdy, A. AbdelSalam, E.A. Shaat, N.Ali Mossa, Z. Abou Moussa, Kh. Abdel-Waged, A.M.-Abdalla, E. El-Falaky
Proposed speaker: M.S. El-Nagdy
Contact person:M.S. El-Nagdy (Helwan University), khelwagd@frcu.eun.eg

Sessions: PA-04 High Energy Heavy Ion Collisions / PL-15 High Energy Heavy Ion Collisions

Supporting papers:

Notes:6/10/00 TY-Fixed last name.


318. On the production of shower particles from various beam collisions with different emulsion targets

The reaction cross sections for p, d, 4He, 6Li, 7Li, 12C, 16O, 24Mg, 28Si and 32S beams with different chemical components of emulsion nuclei at 4.5 AGeV/c have been studied with high statistics, and were compared with the calculations according to Glauber model. The multiplicity distributions of shower produced particles from these interactions with light and heavy emulsion nuclei are analyzed in terms of the negative binomial and Poission distribution laws.

Authors:M.S. El-Nagdy, Kh. Abdel-Waged, E.I. Khalil and S.M. Abdel-Halim
Proposed speaker: M.S. El-Nagdy
Contact person:M.S. El-Nagdy (Helwan University), khelwagd@frcu.eun.eg

Sessions: PA-04 High Energy Heavy Ion Collisions / PL-15 High Energy Heavy Ion Collisions

Supporting papers:

Notes:6/10/00 TY-Fixed last name.


333. High multiplicity PbPb interactions at 158A GeV and their two-dimensional wavelet patterns

Wavelet analysis reveals clustering phenomena in multiparticle production processes. Results of event-by-event studies of some nucleus--nucleus collisions at 158A GeV are reported. The clusterization topology is found to be different in different events. Typical patterns include jets and ring-like structures. They are demonstrated for five high multiplicity events.

Authors:I.M. Dremin, O.V. Ivanov, S.A. Kalinin, K.A. Kotelnikov, V.A. Nechitailo, N.G. Polukhina
Proposed speaker: I.M. Dremin
Contact person:Igor M Dremin (Lebedev Physical Institute), dremin@lpi.ru

Sessions: PA-04 High Energy Heavy Ion Collisions / PL-15 High Energy Heavy Ion Collisions

Supporting papers:

Notes:


357. New Results in Relativistic Nuclear Physics at JINR (Dubna)

New results of the investigations in relativistic nuclear physics at Laboratory of High Energies, Joint Institute for Nuclear Research (JINR) are presented. We have obtained the new data in a Synchrophasotron polarized deuteron beam at our Laboratory [1-4]. The measurement result of the fragmentation of tensor polarized deuterons into cumulative pions are discussed. The correlation data on production of the cumulative proton pairs produced in the interactions of nuclear beams of the novel accelerator Nuclotron with nuclear targets are also discussed [5]. The transverse interaction radius for studying process was determined in this experiment. The predictions made on the basis of the generalization of our results for the production cross section of secondary particles in ultrarelativistic heavy ion collisions are presented too [6]. The results of some other experiments carried out at the Laboratory are also discussed.

Authors:A.Malakhov
Proposed speaker: A.Malakhov
Contact person:Alexander Mikhailovich Baldin (Joint Institute for Nuclear Research), baldin@lhe.jinr.ru

Sessions: PA-04 High Energy Heavy Ion Collisions / PL-15 High Energy Heavy Ion Collisions

Supporting papers: 1. S.V.Afanasiev et al. Physics Letters B434 (1998) 21-27. 2. S.Afanasiev et al. Nuclear Physics A(1997) 817-831. 3. S.Afanasiev et al. Physics Letters B445 (1998) 14-19. 4. V.P.Ladygin et al. Few-Body Systems Suppl.10, 451-454 (1999). 5. Yu.S.Anisimov et al. JINR Rapid Communications No.5-98,pp.25-32 (1998). 6. A.Malakhov. Proceed. of the 29th Intern.Conf.on High Energy Physics, Vancouver, Canada, 23-29 July 1998, World Scientific,V.II, pp.1497-1500.

Notes:


447. Analysis of hadron-nucleus interactions in the framework of two multistring models.

Two multistring models implemented through Monte Carlo codes FRITIOF and VENUS are used to analyse the data from proton-nuclues interactions at high energies. Both models are based on the concept of classical strings. However, the first model, FRITIOF uses longitudinal excitation as a means of string formation, the subsequent string fragmentation follows the Lund fragmentation scheme. The second model, VENUS uses the colour exchange or string flip mechanism for string formation and the fragmentation scheme is based on the Artru-Mennessier models. The analysis gives interesting comparison between the data and the predictions from the two models and provides useful information.

Authors:S.Dhamija and M.Kaur
Proposed speaker: M.Kaur
Contact person:Varinder Singh Bhatia (Panjab University), vsbhatia@glide.net.in

Sessions: PA-04 High Energy Heavy Ion Collisions /

Supporting papers:

Notes:


566. E917 Results on Strangeness Production in Au+Au Collisions at AGS

Enhanced strangeness production is one of the evidences in the recent announcement from CERN of the tentative observation of Quark-Gluon Plasma, in Pb+Pb central collisions. In order to distinguish any extra degree of enhancement, it is crucial to experimentally establish a baseline where strangeness production is purely via hadronic interactions. Experiment E917 at AGS has measured the production of strangeness-carrying particles including kaons, Phi-mesons, lambdas and lambda-bars in Au+Au collisions at fixed target energies of 6, 8 and 11.8 GeV/nucleon. In this talk we will present the Phi-meson yields and the production ratios to kaons and pions as a function of centrality. The direct measurement of the Lambda-bar/p-bar ratio and directed flow of kaons will also be discussed.

Authors:Wen-Chen Chang for E917 Collaboration
Proposed speaker: Wen-Chen Chang
Contact person:Wen-Chen Chang (Academia Sinica), changwc@phys.sinica.edu.tw

Sessions: PA-04 High Energy Heavy Ion Collisions / PL-15 High Energy Heavy Ion Collisions

Supporting papers:

Notes:


633. Hard photon and dilepton production in the quark-gluon plasma

We study the production mechanisms of hard photons and dileptons in the framework of the effective theory obtained when resumming hard thermal loops At the lowest orders in the loop expansion, a new mechanism is found which considerably enhances the production rate. It is then shown that higher orders affect the production rate of real and small mass virtual photons. In particular the Landau-Pomeranchuck-Migdal affects the rate of very hard photons. When the photon mass is vanishing, the rate becomes sensitive to the magnetic mass (similarly to the Linde effect in the thermodynamic potential) and one enters a region where perturbation theory does not apply.

Authors:P. Aurenche, F. Gelis, H. Zaraket
Proposed speaker: P. Aurenche
Contact person:Patrick AURENCHE (LAPP), aurenche@lapp.in2p3.fr

Sessions: PA-04 High Energy Heavy Ion Collisions / PL-15 High Energy Heavy Ion Collisions

Supporting papers: P. Aurenche, F. Gelis, H. Zaraket: -- hep-ph/9903307 (Phys. Rev. D60 (1999) 076002) -- hep-ph/9911367 to appear in Phys. Rev. D -- hep-ph/0003326

Notes:


663. Results of NA49 on Pb+Pb collisions at the CERN SPS

Results of NA49 bearing on the recently announced new state of matter produced in PbPb collisions at Cern will be summarized. In addition recent measurements of the centrality dependence of particle yields and correlations will be discussed. The dependence on the orientation with respect to the impact parameter plane will be investigated.

Authors:NA49
Proposed speaker: Peter Filip
Contact person:Peter Filip (Max-Planck Institute for Physics), pfilips@mppmu.mpg.de

Sessions: PA-04 High Energy Heavy Ion Collisions /

Supporting papers:

Notes:


752. Inclusive studies of pion-nucleus interactions in the framework of Lund fragmentation model

The multistring Lund fragmentation model implemented through Monte Carlo FRITIOF is used to analyse the data from pion-emulsion interactions at energies 50 to 525 GeV. The model is based on the conecpt of classical strings and uses the longitudinal excitation as a means of string formation. The subsequent fragmentation follows the Lund fragmentation scheme. Detailed inclusive studies are done at Plab = 50 GeV/c. Such inclusive studies have been done for the first time. The analysis gives the detailed tests of the model and interesting comparison between the data and the model predictions.

Authors:S. Dhamija, M. Kaur and S. Dahiya
Proposed speaker: M. Kaur
Contact person:Manjit Kaur (Panjab University), manjit@panjabuniv.chd.nic.in

Sessions: PA-04 High Energy Heavy Ion Collisions /

Supporting papers:

Notes:6/10/00 TY-Fixed last name.


777. J/\Psi suppression in an expanding equilibrium hadron gas

We consider an ideal gas of massive hadrons in thermal and chemical equilibrium. The finite-size gas expands longitudinally in accordance with Bjorken law. Also the transverse expansion in a form of the rarefaction wave is considered. We show that J/\Psi suppression in such an environment, when combined with the disintegration in nuclear matter, agrees qualitatively well with the newest NA50 data.

Authors:Dariusz Prorok and Ludwik Turko
Proposed speaker: L. Turko
Contact person:Ludwik Turko (University of Wroclaw), turko@ift.uni.wroc.pl

Sessions: PA-04 High Energy Heavy Ion Collisions / PL-15 High Energy Heavy Ion Collisions

Supporting papers:

Notes:


780. Baryon Stopping: A Link between Elementary p+p Interactions and Controlled-Centrality p+A and A+A Collisions

New data on p+p interactions from the NA49 detector are used to study particle yields and distributions as function of final state proton momentum. The observed correlation functions are then folded with net proton momentum distributions from controlled-centrality p+A and A+A collisions measured with the same detector. Some resulting predictions for pion and kaon yields and longitudinal and transverse momentum distributions in p+A and A+A reactions are compared to data.

Authors:NA49 Collaboration
Proposed speaker: F. Sikler
Contact person:Ferenc Sikler (CERN), Ferenc.Sikler@cern.ch

Sessions: PA-04 High Energy Heavy Ion Collisions / PL-15 High Energy Heavy Ion Collisions

Supporting papers:

Notes:


836. Directed and Elliptic Flow observed in 158 A GeV Pb + Pb Collisions

An event-by-event analysis of the azimuthal angular correlation with respect to the reaction plane has been carried out for K+'s, pi+'s and protons near mid-rapidity and pions and protons near target rapidity in 158 A GeV Pb + Pb collisions. In semi-central collisions, K+'s are found to be preferentially emitted out of the reaction plane, while pions and protons are emitted in the reaction plane near mid rapidity. The results suggest that the kaon emission is influenced by in-medium potential effects in addition to collective flow effects.

Authors:WA98 Collaboration
Proposed speaker: Yasuo Miake (tentative)
Contact person:Yasuo MIAKE (Univ. of Tsukuba), miake@tac.tsukuba.ac.jp

Sessions: PA-04 High Energy Heavy Ion Collisions / PL-15 High Energy Heavy Ion Collisions

Supporting papers: Physics Letters B469(1999)30.

Notes:


1031. Anomalous J/psi suppression in Pb-Pb collisions

I will present the latest NA50 results on charmonia suppression

Authors:NA50 collaboration
Proposed speaker: Michel Gonin
Contact person:Michel D Gonin (ECOLE POLYTECHNIQUE), michel.gonin@in2p3.fr

Sessions: PA-04 High Energy Heavy Ion Collisions /

Supporting papers:

Notes:


1032. Delta++ production in 158AGeV 208Pb + 208Pb collisions.

The delta++ resonance production in central 158 A GeV 208Pb + 208Pb collisions at CERN-SPS has been studied. The delta++ production was estimated from the invariant mass spectra of proton and pi+ pairs by subtracting a mixed event background. The measured delta++ abundance is compared with the results from other experiments at lower energies, and with a model calculation assuming thermal and chemical equilibrium. The effect of delta resonance to the low-mt enhancement of pion inclusive spectrum is also discussed.

Authors:Susumu SATO for CERN-SPS-WA98
Proposed speaker: Susumu SATO
Contact person:Susumu SATO (Univ. of Tsukuba), ssato@tac.tsukuba.ac.jp

Sessions: PA-04 High Energy Heavy Ion Collisions / PL-15 High Energy Heavy Ion Collisions

Supporting papers: Phys. Lett. B477(2000)37-44.

Notes:


1084. Hadronization of gluon jets and quark gluon plasma into gluonic mesons

Thermodynamic aspects of comoving equilibrium frames in high energy-energy density hadron and nuclear collisions are discussed through the quark gluon plasma phase with respect to ensuing hadronisation into gluonic mesons. A comparison with the hadronisation of gluon jets into the same final states is proposed.

Authors:S. Kabana, P. Minkowski and W. Ochs
Proposed speaker: P. Minkowski
Contact person:Peter Minkowski (Universitaet Bern), mink@itp.unibe.ch

Sessions: PA-04 High Energy Heavy Ion Collisions / PL-15 High Energy Heavy Ion Collisions

Supporting papers: P. Minkowski and W. Ochs, Gluon Fragmentation into Glueballs and Hybrid Mesons, hep-ph/0003125 and S. Kabana and P. Minkowski, Glueball production in hadron and nucleus collisions hep-ph/9907570 Journal-ref: Phys.Lett. B472 (2000) 155-160

Notes:This is a 'late' paper and I hope it can still be considered The session proposed below is one possibility, others are PA-03 (eventually PA-01) .


1087. The STAR Experiment at RHIC

The Solenoidal Tracker At RHIC (STAR) is a large acceptance detector capable of tracking charged particles and measuring their momenta in the expected high multiplicity environment at RHIC. It is designed for the search for QGP formation and to investigate the behaviour of strongly interacting matter at high densities in central relativistic collisions. The detector will simultaneously measure many experimental observables to study signatures of the predicted phase transition as well as the space-time evolution of the collision process over a variety of colliding systems. In addition, STAR will investigate very peripheral collisions of relativistic nuclei to study photon and pomeron interactions resulting from the intense electromagnetic fields of the colliding ions. In light of the start of operations at the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory this talk will discuss the status of the STAR experiment and its scientific program. Depending on the status of the collider and the progress in understanding the first data taken, first preliminary results may be presented.

Authors:STAR Collaboration
Proposed speaker: Thomas S. Ullrich
Contact person:Thomas S. Ullrich (Yale Univ.), ullrich@star.physics.yale.edu

Sessions: PA-04 High Energy Heavy Ion Collisions / PL-15 High Energy Heavy Ion Collisions

Supporting papers:

Notes:6/7/00 TY-Entered by hand, sent from a convener.


1088. The PHENIX Experiment at RHIC

PHENIX is a large multi-purpose detector at BNL's Relativistic Heavy Ion Collider. PHENIX focuses on lepton and photon probes in A+A collisions up to sqrt(s) = 200GeV/A and in p+p collisions (unpolarized and polarized) up to sqrt(s) = 500GeV. Hadronic signatures are also studied. RHIC operation with colliding gold beams at energies up to 70 GeV/A is now being commissioned. Initial operations and the physics goals of the present run and the next run will be presented.

Authors:PHENIX Collaboration
Proposed speaker: S.H.Aronson
Contact person:S. H. Aronson (BNL), aronsons@bnl.gov

Sessions: PA-04 High Energy Heavy Ion Collisions / PL-15 High Energy Heavy Ion Collisions

Supporting papers:

Notes:


End of abstracts for PA-04 High Energy Heavy Ion Collisions

[ICHEP Home]