Mikko Laine (Bern):
How well do we know the thermal photon rate?
Abstract: The ALICE experiment at LHC has proposed to replace itself during Long Shutdown 4 through a new experiment, aimed e.g. at studying the production of very soft electromagnetic radiation (pT < 100 MeV). I review what 40 years of theoretical research have taught us about the production of photons from a thermal QCD plasma. In particular, the prospects for constraining the thermal photon rate through lattice QCD are discussed, pointing out that there may still be room for new theoretical ideas in this field.