Two-loop Compton and annihilation processes in thermal QCD
高能物理 - 唯象学
2009-10-31 v1
摘要
We calculate the Compton and annihilation production of a soft static lepton pair in a quark-gluon plasma in the two-loop approximation. We work in the context of the effective perturbative expansion based on the resummation of hard thermal loops. Double counting is avoided by subtracting appropriate counterterms. It is found that the two-loop diagrams give contributions of the same order as the one-loop diagram. Furthermore, these contributions are necessary to obtain agreement with the naive perturbative expansion in the limit of vanishing thermal masses.
引用
@article{arxiv.hep-ph/9903307,
title = {Two-loop Compton and annihilation processes in thermal QCD},
author = {Patrick Aurenche and Francois Gelis and Randy Kobes and Haitham Zaraket},
journal= {arXiv preprint arXiv:hep-ph/9903307},
year = {2009}
}
备注
Latex, 24 pages, postscript figures included with the package graphics