Year: 2009
Type: article
Abstract: We consider the bremsstrahlung energy loss of high-energy partons moving in the quark-gluon plasma, at weak coupling. We show that the rates for these processes receive large $O(g)$ corrections from classical (non-Abelian) plasma physics effects, which are calculated. In the high-energy (deep Landau-Pomeranchuk-Migdal) regime these corrections can be absorbed in a change of the transverse momentum broadening coefficient $\stackrel{^}{q}$, which we give to the next-to-leading order. The correction is large even at relatively weak couplings ${\ensuremath{\alpha}}_{s}\ensuremath{\sim}0.1$, as is typically found for such effects, signaling difficulties with the perturbative expansion. Our approach is based on an effective Euclideanization property of classical physics near the light cone, which allows an effective theory approach in Euclidean space and suggests new possibilities for the nonperturbative lattice study of these effects.
Author: Simon Caron-Huot
Institution: McGill University
Language: Latvian
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2169460360