A medium modified gluon propagator is used to evaluate the scattering cross section for the process gg-->gg in the QCD medium by performing an explicit sum over the polarizations of the gluons. We incorporate a magnetic sreening mass from a non-perturbative study. It is shown that the medium modified cross section is finite, divergence free, and is independent of any ad-hoc momentum transfer cut-off parameters. The medium modified finite cross sections are necessary for a realistic investigation of the production and equilibration of the minijet plasma expected at RHIC and LHC.
@article{arxiv.hep-ph/0109043,
title = {Partonic Scattering Cross Sections in the QCD Medium},
author = {Joerg Ruppert and Gouranga C. Nayak and Dennis D. Dietrich and Horst Stoecker and Walter Greiner},
journal= {arXiv preprint arXiv:hep-ph/0109043},
year = {2009}
}