Photon and dilepton production in the quark-gluon plasma: Perturbation theory vs lattice QCD

. Their calculations involve various resummations to account for well identified physical effects that are briefly described. Lattice calculations of the spectral functions give also access to the dilepton rates. Comparison with perturbative results points to inconsistencies in both approaches when the dilepton energy becomes small.

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12.38.Mh

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