Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-07-25
Eur.Phys.J.C49:9-12,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
contribution to "Hot Quarks 2006", Villasimius, Italy, 15-20 May 2006
Scientific paper
10.1140/epjc/s10052-006-0063-z
It is shown that to leading order the collisional energy loss of an energetic parton in the hot quark gluon plasma reads $dE/dx \sim \alpha(m_D^2)T^2$, where the scale of the coupling is determined by the (parametrically soft) Debye screening mass. Compared to previous expressions derived by Bjorken and other authors, $dE^B/dx \sim \alpha^2 T^2 \ln(ET/m_D^2)$, the rectified result takes into account the running of the coupling, as dictated by quantum corrections beyond tree level. As one significant consequence, due to asymptotic freedom, the QCD collisional energy loss becomes independent of the jet energy in the limit $E \gg T$. It is advocated that this resummation improved perturbative result might be useful to (re-)estimate the collisional energy loss for temperatures relevant in heavy ion phenomenology.
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