Conference paper

Publication year: 2007

Pages: 9-12

Journal: The European Physical Journal C

Volume number: 49

Issue number: 1

ISSN: 1434-6044

DOI Link: https://doi.org/10.1140/epjc/s10052-006-0063-z

Conference: Hot Quarts Workshop on Physics of Ultral-Relativistic Nucleus-Nucleus Collisions

Publisher: SpringerOpen

Abstract: 
It is shown that to leading order the collisional energy loss of an energetic parton in the hot quark gluon plasma reads dE/dx similar to 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 similar to 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 >> T. It is argued why this resummation-improved perturbative result is useful to (re-) estimate the collisional energy loss for temperatures relevant in heavy ion phenomenology.

Harvard Citation style: Peshier, A. (2007) Rethinking the QCD collisional energy loss, The European Physical Journal C, 49(1), pp. 9-12. https://doi.org/10.1140/epjc/s10052-006-0063-z

APA Citation style: Peshier, A. (2007). Rethinking the QCD collisional energy loss. The European Physical Journal C. 49(1), 9-12. https://doi.org/10.1140/epjc/s10052-006-0063-z