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Description
Current status of experiment and theory
Introduction by Misha Stephanov:
Event-by-event fluctuations: what can we learn about QCD ?
The event-by-event fluctuations in heavy-ion collisions will be discussed from theoretical and (partly) experimental perspective with the emphasis on what we can learn about QCD in extreme conditions.
1) Misha Stephanov (UI Chicago/RBRC)
QCD critical point and event-by-event fluctuations
I shall discuss the physics of the critical end-point of the first order (chiral) phase transition in QCD as well as the experimental signatures which can be used to discover such a point.
2) Thomas Trainor (Univ. of Washington)
Event-by-Event Theory and Experiment at RHIC and SPS
I review the system of fluctuation/correlation analysis methods presently under development for event-by-event analysis, which range from direct analysis of the correlation structure of two-particle momentum space to variance comparisons based on the central limit theorem. I then consider recent applications to STAR data at RHIC and contrast these results with measurements by NA49 at the SPS, focussing on the distinction between charge independent and charge dependent correlation structures. I conclude with a possible source of charge-dependent correlations.
3) Edward Shuryak (Stony Brook)
Comments on observed Event-by-Event fluctuations at RHIC
First we discuss the possible origin of rather large event-by-event pt-fluctuations measured in STAR. Two suggestions are discussed:
i) initial state fluctuations due to non-perturbative clusters
ii) final state interactions due to light sigma (tricritical point).
Another subject to be discussed is how the magnitude of charge fluctuations depends on the detector acceptance.
4) Ulrich Heinz (Ohio State University)
Fluctuations of net electric and baryon charge as deconfinement signatures
I shortly review our work done a year ago with Asakawa and Mueller on net charge fluctuations as a possible signature for quark deconfinement. I will also discuss some issues that came up in reaction to our paper, in particular initial state fluctuations and final-state wash-out.
5) Stanislaw Mrowczynski (Soltan Institute, Warsaw)
Event-by-event pt-fluctuations
pt-fluctuations studied by means of the so-called Phi-measure are discussed. We consider various sources of dynamical fluctuations and analyze in detail the effects of quantum statistics and temperature fluctuations.
6) Waldek Retyk for NA49 collaboration, (Warsaw University)
Event-by-event pt fluctuations in nuclear collisions at 158 A GeV
7) Jacek Zaranek for NA49 collaboration, (Frankfurt University)
Charge fluctuations in central Pb+Pb collisions at 40, 80 and 158 A GeV
8) Hiroyuki Sako for NA45 collaboration, (GSI)
Event-by-event mean pT fluctuations in Pb+Au collisions at 40, 80 and 158 A GeV
9) Bedanga Mohanty for WA98 collaboration, (Inst. of Physics, Bhubaneswar)
Localized Charge-Neutral fluctuations in 158A GeV Pb+Pb collisions
Results on localized fluctuations in the multiplicity of charged particles and photons produced in central 158A GeV/c Pb+Pb collisions
will be presented. The charged versus neutral correlations in common eta-phi phase space regions of varying azimuthal size are analyzed by two different methods. The analysis provides a model-independent demonstration of nonstatistical fluctuations in both charged particle and photon multiplicities in limited azimuthal regions. The possibility of formation of disoriented chiral condensates (DCC) at SPS energies will be discussed.
10) Jeff Reid for STAR collaboration (University of Washington)
Event-by-event fluctuations and correlations in pt andmultiplicity at RHIC
I review the first experimental results from the STAR detector on <pt> and multiplicity fluctuations and pt correlations. Significant non-statistical effects are observed in variance and two-particle correlation measures.
11) Gunter Roland for PHOBOS collaboration, (MIT)
Event-by-event fluctuation analysis in PHOBOS at RHIC
Organiser(s): Yiota Foka, Guy Paic and Urs Wiedemann
Organiser(s): Yiota Foka, Guy Paic and Urs Wiedemann