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Two-loop Compton and annihilation processes in thermal QCD
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Two-loop Compton and annihilation processes in thermal QCD
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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.
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Cited by 1 Pith paper
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Beyond leading-logarithm photon production from two-loop diagrams in a hot QCD medium
Two-loop imaginary-time QCD self-energies yield the same hard-photon LL and BLL rates as kinetic theory for Compton and qq̄ annihilation, with topology II vanishing on-shell but restoring the Ward identity.
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