Gluon Bremsstrahlung in Weakly-Coupled Plasmas

Details Gluon Bremsstrahlung in Weakly-Coupled Plasmas Gluon Bremsstrahlung in Weakly-Coupled Plasmas

2009-07-06

arxiv.org/abs/0907.1029v3

Nucl.Phys.A830:211c-214c,2009

Physics

Nuclear Physics

Nuclear Theory

4 pages, 2 figures - To appear in the conference proceedings for Quark Matter 2009, March 30 - April 4, Knoxville, Tennessee [

Scientific paper

10.1016/j.nuclphysa.2009.09.022

I report on some theoretical progress concerning the calculation of gluon bremsstrahlung for very high energy particles crossing a weakly-coupled quark-gluon plasma. (i) I advertise that two of the several formalisms used to study this problem, the BDMPS-Zakharov formalism and the AMY formalism (the latter used only for infinite, uniform media), can be made equivalent when appropriately formulated. (ii) A standard technique to simplify calculations is to expand in inverse powers of logarithms $\ln(E/T)$. I give an example where such expansions are found to work well for $\omega/T \gtrsim 10$ where $\omega$ is the bremsstrahlung gluon energy. (iii) Finally, I report on perturbative calculations of $\hat q$.

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