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Title: Directed and elliptic flow in heavy-ion collisions from E{sub beam}=90 MeV/nucleon to E{sub c.m.}=200 GeV/nucleon

Abstract

Recent data from the NA49 experiment on directed and elliptic flow for Pb+Pb reactions at CERN-SPS are compared to calculations with a hadron-string transport model, the ultrarelativistic quantum molecular dynamics (UrQMD) model. The rapidity and transverse momentum dependence of the directed and elliptic flow, i.e., v{sub 1} and v{sub 2}, are investigated. The flow results are compared to data at three different centrality bins. Generally, a reasonable agreement between the data and the calculations is found. Furthermore, the energy excitation functions of v{sub 1} and v{sub 2} from E{sub beam}=90A MeV to E{sub c.m.}=200A GeV are explored within the UrQMD framework and discussed in the context of the available data. It is found that, in the energy regime below E{sub beam}{<=}10A GeV, the inclusion of nuclear potentials is necessary to describe the data. Above 40A GeV beam energy, the UrQMD model starts to underestimate the elliptic flow. Around the same energy the slope of the rapidity spectra of the proton directed flow develops negative values. This effect is known as the third flow component (''antiflow'') and cannot be reproduced by the transport model. These differences can possibly be explained by assuming a phase transition from hadron gas to quark gluonmore » plasma at about 40A GeV.« less

Authors:
;  [1];  [2];  [1];  [3];  [4]
  1. Institut fuer Theoretische Physik, Johann Wolfgang Goethe-Universitaet, Max-von-Laue-Str. 1, D-60438 Frankfurt (Germany)
  2. Frankfurt Institute for Advanced Studies (FIAS), Max-von-Laue-Str. 1, D-60438 Frankfurt (Germany)
  3. (FIAS), Max-von-Laue-Str. 1, D-60438 Frankfurt (Germany)
  4. (China)
Publication Date:
OSTI Identifier:
20864230
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 74; Journal Issue: 6; Other Information: DOI: 10.1103/PhysRevC.74.064908; (c) 2006 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; CERN SPS SYNCHROTRON; EXCITATION FUNCTIONS; GEV RANGE; LEAD 208 REACTIONS; LEAD 208 TARGET; MEV RANGE; MOLECULAR DYNAMICS METHOD; NUCLEAR POTENTIAL; PARTICLE RAPIDITY; PHASE TRANSFORMATIONS; PROTONS; QUARK MATTER; RELATIVISTIC RANGE; TRANSPORT THEORY; TRANSVERSE MOMENTUM

Citation Formats

Petersen, Hannah, Bleicher, Marcus, Li Qingfeng, Zhu Xianglei, Frankfurt Institute for Advanced Studies, and Physics Department, Tsinghua University, Beijing 100084. Directed and elliptic flow in heavy-ion collisions from E{sub beam}=90 MeV/nucleon to E{sub c.m.}=200 GeV/nucleon. United States: N. p., 2006. Web. doi:10.1103/PHYSREVC.74.064908.
Petersen, Hannah, Bleicher, Marcus, Li Qingfeng, Zhu Xianglei, Frankfurt Institute for Advanced Studies, & Physics Department, Tsinghua University, Beijing 100084. Directed and elliptic flow in heavy-ion collisions from E{sub beam}=90 MeV/nucleon to E{sub c.m.}=200 GeV/nucleon. United States. doi:10.1103/PHYSREVC.74.064908.
Petersen, Hannah, Bleicher, Marcus, Li Qingfeng, Zhu Xianglei, Frankfurt Institute for Advanced Studies, and Physics Department, Tsinghua University, Beijing 100084. Fri . "Directed and elliptic flow in heavy-ion collisions from E{sub beam}=90 MeV/nucleon to E{sub c.m.}=200 GeV/nucleon". United States. doi:10.1103/PHYSREVC.74.064908.
@article{osti_20864230,
title = {Directed and elliptic flow in heavy-ion collisions from E{sub beam}=90 MeV/nucleon to E{sub c.m.}=200 GeV/nucleon},
author = {Petersen, Hannah and Bleicher, Marcus and Li Qingfeng and Zhu Xianglei and Frankfurt Institute for Advanced Studies and Physics Department, Tsinghua University, Beijing 100084},
abstractNote = {Recent data from the NA49 experiment on directed and elliptic flow for Pb+Pb reactions at CERN-SPS are compared to calculations with a hadron-string transport model, the ultrarelativistic quantum molecular dynamics (UrQMD) model. The rapidity and transverse momentum dependence of the directed and elliptic flow, i.e., v{sub 1} and v{sub 2}, are investigated. The flow results are compared to data at three different centrality bins. Generally, a reasonable agreement between the data and the calculations is found. Furthermore, the energy excitation functions of v{sub 1} and v{sub 2} from E{sub beam}=90A MeV to E{sub c.m.}=200A GeV are explored within the UrQMD framework and discussed in the context of the available data. It is found that, in the energy regime below E{sub beam}{<=}10A GeV, the inclusion of nuclear potentials is necessary to describe the data. Above 40A GeV beam energy, the UrQMD model starts to underestimate the elliptic flow. Around the same energy the slope of the rapidity spectra of the proton directed flow develops negative values. This effect is known as the third flow component (''antiflow'') and cannot be reproduced by the transport model. These differences can possibly be explained by assuming a phase transition from hadron gas to quark gluon plasma at about 40A GeV.},
doi = {10.1103/PHYSREVC.74.064908},
journal = {Physical Review. C, Nuclear Physics},
number = 6,
volume = 74,
place = {United States},
year = {Fri Dec 15 00:00:00 EST 2006},
month = {Fri Dec 15 00:00:00 EST 2006}
}