Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-07-09
Nucl.Phys. A628 (1998) 161-169
Physics
High Energy Physics
High Energy Physics - Phenomenology
11 pages, 4 figures, Revtex, submitted to Phys. Rev. C
Scientific paper
10.1016/S0375-9474(97)00619-2
The definition of thermal relaxation time is extended to chemically non-equilibrated quark-gluon plasma and the chemical non-equilibrated thermal relaxation times for partons are calculated using the non-equilibrium Debye mass as the infrared regulator. The dependence of the thermal relaxation time on the fugacity is given and the influence of the chemical non-equilibration is discussed. We find that there are threshold fugacities $\lambda_g^*$ and $\lambda_q^*$ for gluons and quarks. For \lambda_g < \lambda_g^* (\lambda_q < \lambda_q^*), \tau_g^{NEQ}/\tau_g^{EQ} (\tau_q^{NEQ}/\tau_q^{EQ}) decreases strongly with increasing fugacity, while for $\lambda_g > \lambda_g^* (\lambda_q>\lambda_q^*$), the ratios are almost 1. It is shown that there is also the two-stage equilibration in a chemically non-equilibrated plasma. We also discussed the effect of using the non-equilibrium Deby mass as the infrared cutoff.
Chao Wei-Qin
Zhang Xiao-Fei
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