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Advances in High Energy Physics
Volume 2013 (2013), Article ID 515420, 6 pages
Research Article

Charged-Hadron Pseudorapidity Distributions in p-p and Pb-Pb Collisions at LHC Energies

Department of Physics, Shanxi University, Taiyuan, Shanxi 030006, China

Received 26 June 2013; Revised 22 July 2013; Accepted 23 July 2013

Academic Editor: Fu-Hu Liu

Copyright © 2013 Bao-Chun Li and Ya-Zhou Wang. 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.


Pseudorapidity distributions of charged hadrons produced in p-p and Pb-Pb collisions at LHC energies were measured by the CMS and ALICE Collaborations, respectively. An improved Tsallis distribution in the two-cylinder model is used to describe the pseudorapidity spectra. We consider the rapidity shift at the longitudinal direction in the geometrical picture of the collisions. The calculated results are in agreement with the experimental data. The gap between the projectile cylinder and the target cylinder increases with the centralities. The rapidity shifts in the cylinders also increase with the centralities.