Abstract
The production of {mu}{sup +}{mu}{sup {minus}} and {gamma}{gamma} pairs from expanding hot hadronic matter in ultrarelativistic heavy-ion collisions is computed in a model which exhibits a first-order phase transition between a hadron gas and a quark-gluon plasma. In this model the change of the equation of state with respect to the ideal-pion-gas approximation results in a steepening of the hadron-gas contribution to the invariant-mass distributions. In particular quark-gluon-plasma formation becomes more evident even in {gamma}{gamma} pair production.
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