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Advances in High Energy Physics
Volume 2013, Article ID 450247, 8 pages
Research Article

Speed of Sound Parameter from RHIC and LHC Heavy-Ion Data

Institute of Theoretical Physics, Shanxi University, Taiyuan, Shanxi 030006, China

Received 28 June 2013; Revised 25 August 2013; Accepted 27 August 2013

Academic Editor: George Siopsis

Copyright © 2013 Li-Na Gao et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


In framework of combing the participant-spectator model and the Landau hydrodynamic model, the pseudorapidity distributions of charged particles produced in heavy-ion (or nucleus-nucleus) collisions at RHIC and LHC energies are described by a modified Landau hydrodynamic model, where the Landau hydrodynamic model is applied to the target/projectile spectators and the target/projectile participants, respectively. The modeling results are in agreement with the PHOBOS and ALICE experimental data. Then, the values of square speed of sound () for the participants and spectators can be obtained from the widths of charged particle pseudorapidity distributions. Some features of for different centralities and center-of-mass energies are obtained too.