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The rates of thermal emission of photons and lepton pairs from quark matter formed in ultrarelativistic nuclear collisions are related to the conserved total entropy of the quark matter. The transient existence of quark matter can be diagnosed by measuring the entropy separately from particle multiplicities and comparing the predicted and observed rates. The thermal soft-multiple-scattering rates are compared with the direct hard-single-scattering rates. Transverse-momentum effects, the background due to DD decays, and fluctuations are discussed.
Hwa et al. (Sun,) studied this question.