Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1993-05-07
Phys.Lett. B313 (1993) 149-154; Erratum-ibid. B316 (1993) 633
Physics
High Energy Physics
High Energy Physics - Phenomenology
7 pages, 5 figures (available upon request), CERN preprint CERN-TH-6882/93
Scientific paper
10.1016/0370-2693(93)91204-Z
We calculate production rates for massless $(u,d)$ and massive $(s,c,b)$ quarks in pure glue and quark gluon plasmas to leading order in the strong coupling constant $g$. The leading contribution comes from gluon decay into $q\bar q$ pairs, using a thermal gluon propagator with finite thermal mass and damping rate. The rate behaves as $\alpha_S^2(\ln 1/\alpha_S)^2 T^4$ when $m, \alpha_S \rightarrow 0$ and depends linearly on the transverse gluon damping rate for all values of the quark mass $m$. The light quark ($u$, $d$, $s$) chemical equilibration time is approximately 10-100 $T^{-1}$ for $g=$2-3, so that quarks are likely to remain far from chemical equilibrium in ultrarelativistic nuclear collisions.
Altherr Tanguy
Seibert David
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