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Title: Elliptic flow analysis in Au+Au collisions at {radical}(s{sub NN})=200 GeV: Fluctuations vs non-flow effects

Abstract

The cumulant method is applied to study elliptic flow (v{sub 2}) in Au+Au collisions at {radical}(s)=200A GeV, with the UrQMD model. In this approach, the true event plane is known and both the nonflow effects and event-by-event spatial ({epsilon}) and v{sub 2} fluctuations exist. Qualitatively, the hierarchy of v{sub 2}s from two-, four-, and six-particle cumulants is consistent with the STAR data; however, the magnitude of v{sub 2} in the UrQMD model is only 60% of the data. We find that the four- and six-particle cumulants are good measures of the real elliptic flow over a wide range of centralities except for the most central and very peripheral events. There the cumulant method is affected by the v{sub 2} fluctuations. In midcentral collisions, the four- and six-particle cumulants are shown to give a good estimation of the true differential v{sub 2}, especially at large transverse momentum, where the two-particle cumulant method is heavily affected by the nonflow effects.

Authors:
 [1];  [2];  [3];  [4];  [1];  [2]
  1. Frankfurt Institute for Advanced Studies (FIAS), Max-von-Laue-Strasse 1, D-60438 Frankfurt (Germany)
  2. (Germany)
  3. (China)
  4. Institut fuer Theoretische Physik, Johann Wolfgang Goethe-Universitaet, Max-von-Laue-Strasse 1, D-60438 Frankfurt (Germany)
Publication Date:
OSTI Identifier:
20771140
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 72; Journal Issue: 6; Other Information: DOI: 10.1103/PhysRevC.72.064911; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; FLUCTUATIONS; GEV RANGE; GOLD 197 REACTIONS; GOLD 197 TARGET; HYDRODYNAMIC MODEL; MULTIPARTICLE SPECTROMETERS; PARTICLE IDENTIFICATION; TRANSVERSE MOMENTUM

Citation Formats

Zhu Xianglei, Institut fuer Theoretische Physik, Johann Wolfgang Goethe-Universitaet, Max-von-Laue-Strasse 1, D-60438 Frankfurt, Physics Department, Tsinghua University, Beijing 100084, Bleicher, Marcus, Stoecker, Horst, and Institut fuer Theoretische Physik, Johann Wolfgang Goethe-Universitaet, Max-von-Laue-Strasse 1, D-60438 Frankfurt. Elliptic flow analysis in Au+Au collisions at {radical}(s{sub NN})=200 GeV: Fluctuations vs non-flow effects. United States: N. p., 2005. Web. doi:10.1103/PhysRevC.72.064911.
Zhu Xianglei, Institut fuer Theoretische Physik, Johann Wolfgang Goethe-Universitaet, Max-von-Laue-Strasse 1, D-60438 Frankfurt, Physics Department, Tsinghua University, Beijing 100084, Bleicher, Marcus, Stoecker, Horst, & Institut fuer Theoretische Physik, Johann Wolfgang Goethe-Universitaet, Max-von-Laue-Strasse 1, D-60438 Frankfurt. Elliptic flow analysis in Au+Au collisions at {radical}(s{sub NN})=200 GeV: Fluctuations vs non-flow effects. United States. doi:10.1103/PhysRevC.72.064911.
Zhu Xianglei, Institut fuer Theoretische Physik, Johann Wolfgang Goethe-Universitaet, Max-von-Laue-Strasse 1, D-60438 Frankfurt, Physics Department, Tsinghua University, Beijing 100084, Bleicher, Marcus, Stoecker, Horst, and Institut fuer Theoretische Physik, Johann Wolfgang Goethe-Universitaet, Max-von-Laue-Strasse 1, D-60438 Frankfurt. Thu . "Elliptic flow analysis in Au+Au collisions at {radical}(s{sub NN})=200 GeV: Fluctuations vs non-flow effects". United States. doi:10.1103/PhysRevC.72.064911.
@article{osti_20771140,
title = {Elliptic flow analysis in Au+Au collisions at {radical}(s{sub NN})=200 GeV: Fluctuations vs non-flow effects},
author = {Zhu Xianglei and Institut fuer Theoretische Physik, Johann Wolfgang Goethe-Universitaet, Max-von-Laue-Strasse 1, D-60438 Frankfurt and Physics Department, Tsinghua University, Beijing 100084 and Bleicher, Marcus and Stoecker, Horst and Institut fuer Theoretische Physik, Johann Wolfgang Goethe-Universitaet, Max-von-Laue-Strasse 1, D-60438 Frankfurt},
abstractNote = {The cumulant method is applied to study elliptic flow (v{sub 2}) in Au+Au collisions at {radical}(s)=200A GeV, with the UrQMD model. In this approach, the true event plane is known and both the nonflow effects and event-by-event spatial ({epsilon}) and v{sub 2} fluctuations exist. Qualitatively, the hierarchy of v{sub 2}s from two-, four-, and six-particle cumulants is consistent with the STAR data; however, the magnitude of v{sub 2} in the UrQMD model is only 60% of the data. We find that the four- and six-particle cumulants are good measures of the real elliptic flow over a wide range of centralities except for the most central and very peripheral events. There the cumulant method is affected by the v{sub 2} fluctuations. In midcentral collisions, the four- and six-particle cumulants are shown to give a good estimation of the true differential v{sub 2}, especially at large transverse momentum, where the two-particle cumulant method is heavily affected by the nonflow effects.},
doi = {10.1103/PhysRevC.72.064911},
journal = {Physical Review. C, Nuclear Physics},
number = 6,
volume = 72,
place = {United States},
year = {Thu Dec 15 00:00:00 EST 2005},
month = {Thu Dec 15 00:00:00 EST 2005}
}