Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-10-07
Physics
High Energy Physics
High Energy Physics - Phenomenology
five pages, 6 figures and going to sumit in Journal of physics G
Scientific paper
The direct photon radiation from a hot and slightly strong interacting fireball system of a rich baryon quark-gluon plasma, using the Boltzmann distribution function for the incoming particles and Bose-Einstein distribution for gluon and Fermi-Dirac distribution for quark,antiquark and Boltzmann distribution for gluon are discussed subsequently. The first two distribution functions are chosen for the photon production of the first case and the last two functions are considered for the second case of my photon production. The thermal photon emission rate is found that it is infra-red divergent for the massless quarks and this divergence in the quark mass is regulated using different cut-off in the quark mass. However, I remove this divergence using the technique of Braaten and Pisarski in the thermal mass of the system in my model of calculation with a coupling parameter of QGP fireball. Thus, the production rate of the thermal photon is found to be smoothly worked by this cut-off technique of this model and the result is found to be increasing function with the increase of the variation in the value of the chemical potential $\mu $
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