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Advances in High Energy Physics
Volume 2014, Article ID 479401, 13 pages
Research Article

Particle Yields in Heavy Ion Collisions and the Influence of Strong Magnetic Fields

Departamento de Física, CFM, Universidade Federal de Santa Catarina, 88.040-900 Florianópolis, SC, Brazil

Received 11 June 2013; Revised 20 December 2013; Accepted 22 December 2013; Published 20 January 2014

Academic Editor: Alexey Petrov

Copyright © 2014 M. G. de Paoli and D. P. Menezes. 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.


It is expected that the magnetic fields in heavy ion collisions are very high. In this work, we investigate the effects of a strong magnetic field on particle ratios within a thermal model of particle production. We model matter as a free gas of baryons and mesons under the influence of an external magnetic field varying from zero to through an   fitting to some data sets of the STAR experiment. For this purpose, we use the Dirac, Rarita-Schwinger, Klein-Gordon, and Proca equations subject to magnetic fields in order to obtain the energy expressions and the degeneracy for spin 1/2, spin 3/2, spin 0, and spin 1 particles, respectively. Our results show that, if the magnetic field can be considered as slowly varying and leaves its signature on the particle yields, a field of the order of produces an improved fitting to the experimental data as compared to the calculations without magnetic field.