On the collinear singularity problem of hot QCD Original Research Article

The collinear singularity problem of hot QCD is revisited within a perturbative resummation scheme (PR) of the leading thermal fluctuations. On the basis of actual calculations, new aspects are discovered concerning the origin of the singularity plaguing the soft real photon emission rate out of a quark–gluon plasma at thermal equilibrium, when the latter is calculated by means of the Resummation Program (RP).