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The effect of baryon density on parton production processes of$gg\rightleftharpoons ggg$ and $gg\rightleftharpoons q{\bar q}$ is studiedusing full phase space distribution function and also with inclusion of quantumstatistics i.e. Pauli blocking and Bose enhancement factors, in the case ofboth saturated and unsaturated quark gluon plasma. The rate for the process $gg\rightleftharpoons q{\bar q}$ is found to be much less as compared to the mostcommonly used factorized result obtained on the basis of classicalapproximation. This discrepancy, which is found both at zero as well as atfinite baryon densities, however, is not due to the lack of quantum statisticsin the classical approximation, rather due to the use of Fermi-Dirac andBose-Einstein distribution functions for partons instead of Boltzmanndistribution which is appropriate under such approximation. Interestingly, therates of parton production are found to be insensitive to the baryo-chemicalpotential particularly when the plasma is unsaturated although the process ofchemical equilibration strongly depends on it. The thermal photon yields, havebeen calculated specifically from unsaturated plasma at finite baryon density.The exact results obtained numerically are found to be in close agreement withthe analytic expression derived using factorized distribution functionsappropriate for unsaturated plasma. Further, it is shown that in the case ofunsaturated plasma, the thermal photon production is enhanced with increasingbaryon density both at fixed temperature and fixed energy density of the quarkgluon plasma.Comment: Latex, 24 pages, 6 postscript figures. Submitted to Phys. Rev.

Effect of baryon density on parton production, chemical equilibration, and thermal photon emission from the quark gluon plasma