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Title: Decreasing elliptic flow at the CERN Large Hadron Collider: Calculations in a parton recombination approach

Abstract

We apply the parton recombination approach to study the energy dependence of the elliptic flow, v{sub 2}, in heavy ion collisions from BNL Alternating Gradient Synchrotron (AGS) to CERN Large Hadron Collider (LHC) energies. The relevant input quantities (T,{mu}{sub B},{eta}{sub T}) at the various center of mass energies are obtained from fits to the available data. The model yields a good description of the integrated v{sub 2} data for charged particles at midrapidity from AGS to BNL Relativistic Heavy Ion Collider (RHIC) energies. In stark contrast to the current expectations, we observe a decrease of the integrated v{sub 2} values above the highest RHIC energy. Thus, we predict a decrease of v{sub 2} at LHC energies compared to the RHIC results. This drop is attributed to negative v{sub 2} values for the underlying parton distributions at low to moderate transverse momenta that develop if the transverse flow velocity is high enough. At energies above the LHC regime, the present approach predicts even negative values for the integrated v{sub 2}.

Authors:
;  [1]
  1. Institut fuer Theoretische Physik, Johann Wolfgang Goethe-Universitaet, Max-von-Laue-Str. 1, D-60438 Frankfurt am Main (Germany)
Publication Date:
OSTI Identifier:
21199385
Resource Type:
Journal Article
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 78; Journal Issue: 5; Other Information: DOI: 10.1103/PhysRevC.78.054903; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2813
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; BNL; BROOKHAVEN RHIC; CENTER-OF-MASS SYSTEM; CERN LHC; CHARGED PARTICLES; CURRENTS; DISTRIBUTION; ENERGY DEPENDENCE; HADRONS; HEAVY ION REACTIONS; QUARK MODEL; RECOMBINATION; SIMULATION; TRANSVERSE MOMENTUM; VELOCITY

Citation Formats

Krieg, Daniel, and Bleicher, Marcus. Decreasing elliptic flow at the CERN Large Hadron Collider: Calculations in a parton recombination approach. United States: N. p., 2008. Web. doi:10.1103/PHYSREVC.78.054903.
Krieg, Daniel, & Bleicher, Marcus. Decreasing elliptic flow at the CERN Large Hadron Collider: Calculations in a parton recombination approach. United States. doi:10.1103/PHYSREVC.78.054903.
Krieg, Daniel, and Bleicher, Marcus. Sat . "Decreasing elliptic flow at the CERN Large Hadron Collider: Calculations in a parton recombination approach". United States. doi:10.1103/PHYSREVC.78.054903.
@article{osti_21199385,
title = {Decreasing elliptic flow at the CERN Large Hadron Collider: Calculations in a parton recombination approach},
author = {Krieg, Daniel and Bleicher, Marcus},
abstractNote = {We apply the parton recombination approach to study the energy dependence of the elliptic flow, v{sub 2}, in heavy ion collisions from BNL Alternating Gradient Synchrotron (AGS) to CERN Large Hadron Collider (LHC) energies. The relevant input quantities (T,{mu}{sub B},{eta}{sub T}) at the various center of mass energies are obtained from fits to the available data. The model yields a good description of the integrated v{sub 2} data for charged particles at midrapidity from AGS to BNL Relativistic Heavy Ion Collider (RHIC) energies. In stark contrast to the current expectations, we observe a decrease of the integrated v{sub 2} values above the highest RHIC energy. Thus, we predict a decrease of v{sub 2} at LHC energies compared to the RHIC results. This drop is attributed to negative v{sub 2} values for the underlying parton distributions at low to moderate transverse momenta that develop if the transverse flow velocity is high enough. At energies above the LHC regime, the present approach predicts even negative values for the integrated v{sub 2}.},
doi = {10.1103/PHYSREVC.78.054903},
journal = {Physical Review. C, Nuclear Physics},
issn = {0556-2813},
number = 5,
volume = 78,
place = {United States},
year = {2008},
month = {11}
}