KLN theorem, magnetic mass, and thermal photon production
Abstract
We study the infrared singularities associated to ultra-soft transverse gluons in the calculation of photon production by a quark-gluon plasma. Despite the fact that the KLN theorem works in this context and provides cancellations of infrared singularities, it does not prevent the production rate of soft photons to be sensitive to the magnetic mass of gluons and therefore the rate to be non perturbative. However the rate of production of very hard photons is insensitive to the magnetic scale.Keywords
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