Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-07-04
Physics
High Energy Physics
High Energy Physics - Phenomenology
ReVTex 4, 17 pages, 9 figures. The reason for the big gap between Xu-Greiner's \eta_{22+23}/s and that with exact matrix eleme
Scientific paper
We calculate the leading order bulk viscosity \zeta of a gluon plasma in perturbative QCD with the finite angle non-collinear inelastic scatterings neglected by the previous calculation of Arnold, Dogan and Moore (ADM) included. We agree with the ADM's leading order result within errors. In contrast, our previous result on shear viscosity \eta is smaller than that of Arnold, Moore and Yaffe (AMY) by 10-20% at intermediate couplings due to finite angle scatterings. Our result shows that the gluon plasma in the perturbative region is equally conformal (with almost the same \zeta) but more perfect (with smaller \eta) than previously obtained. We also generalize our result to a general SU(N_c) pure gauge theory and summarize the current status of the viscosity computations in QCD.
Chen Jiunn-Wei
Deng Jian
Dong Hui
Wang Qiangguo
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