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Advances in High Energy Physics
Volume 2013 (2013), Article ID 836071, 10 pages
Research Article

Entropy Analysis in Relativistic Heavy-Ion Collisions

1Department of Physics, Aligarh Muslim University, Aligarh 202002, India
2Department of Applied Physics, Aligarh Muslim University, Aligarh 202002, India

Received 2 June 2013; Revised 16 August 2013; Accepted 18 August 2013

Academic Editor: Fu-Hu Liu

Copyright © 2013 Shakeel Ahmad 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.


Entropy creation in multiparticle system is investigated by analysing the experimental data on ion-ion collisions at AGS and SPS energies and the results thus obtained are compared with those predicted by multiphase transport and correlation-free Monte Carlo models. Entropies produced in limited- and full-phase space are observed to increase with increasing beam energy. The entropy values, normalized to the maximum rapidity and plotted against pseudorapidity (bin width also normalized to the maximum rapidity), are found to be energy independent, exhibiting a kind of entropy scaling. Such scaling is observed in the full phase space as well as in the regions confined to the forward or backward hemispheres. The findings also reveal that there exist strong correlations amongst the particles produced in the forward and backward hemispheres around the midrapidity. These correlations are found to be of short range in nature, and the contributions from the long-range correlations seem to be absent. PACS numbers: 25.75-q, 25.75.Gz.