# Nuclear Physics Seminar

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The thermal photon rate at NLO

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Jacopo Ghiglieri (McGill University)

#### Thursday, October 10th, 2013, 11:10 am

We present a calculation of the rate for photon production from a weakly-coupled quark-gluon
plasma at next-to-leading order. We first give an overview of the leading-order (*e*^{2}g^{2}) result and
show how it decomposes in a region dominated by 2↔2 processes (*gq*→γ*q* and *qq̅*→γ*g*)
and in one dominated by collinear radiation processes. At NLO (*e*^{2}g^{3}) both regions receive order-*g*
corrections from momenta of order *gT*. We show how Euclidean and sum rule techniques can be
introduced and how this technological advancement renders the calculation simpler than expected. The
resulting correction is O(15-20%) for α_{s}=0.3 and *k/T*<10. Finally, we show how similar
techniques can be applied to deal with highly energetic partons and jets.

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