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Advances in High Energy Physics
Volume 2014, Article ID 569079, 9 pages
Research Article

Pseudorapidity Distribution of Charged Particles and Square Speed of Sound Parameter in or Collisions over an Energy Range from 0.053 to 7 TeV

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

Received 20 February 2014; Accepted 28 March 2014; Published 22 April 2014

Academic Editor: George Siopsis

Copyright © 2014 Ya-Qin 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. The publication of this article was funded by SCOAP3.


Pseudorapidity distributions of charged particles produced in proton-proton ( ) or proton-antiproton ( ) collisions over an energy range from 0.053 to 7 TeV are studied by using the four-component Landau hydrodynamic model. The results calculated by the model are in agreement with the experimental data of the UA5, PHOBOS, UA1, P238, CDF, ALICE, and CMS Collaborations which present orderly from low to high energies. According to the distribution widths of different components, the values and some features of square speed of sound parameter for “participant” and “spectator” quark components are obtained. It is shown that the speed of sound for “participant” quark components agrees approximately with that for “spectator” quark components in the error ranges. The present work is useful for studying nucleus-nucleus collisions in the related energy range.