Retardation Effect for Collisional Energy Loss of Hard Partons Produced in a QGP

Details Retardation Effect for Collisional Energy Loss of Hard Partons Produced in a QGP Retardation Effect for Collisional Energy Loss of Hard Partons Produced in a QGP

2005-09-19

arxiv.org/abs/hep-ph/0509185v2

JHEP0604:011,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

19 pages, 4 figures. Substantial changes have been made in version 2, especially in section 3. In particular, in section 3.2 t

Scientific paper

10.1088/1126-6708/2006/04/011

We study the collisional energy loss suffered by an energetic parton travelling the distance L in a high temperature quark-gluon plasma and initially produced in the medium. We find that the medium-induced collisional loss -Delta E(L) is strongly suppressed compared to previous estimates which assumed the collisional energy loss rate -dE/dx to be constant. The large L linear asymptotic behaviour of -Delta E(L) sets in only after a quite large retardation time. The suppression of -Delta E(L) is partly due to the fact that gluon bremsstrahlung arising from the initial acceleration of the energetic parton is reduced in the medium compared to vacuum. The latter radiation spectrum is sensitive to the plasmon modes of the quark-gluon plasma and has a rich angular structure.

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