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Thermal photon production in high-energy nuclear collisions

John J. Neumann, David Seibert, George Fai

nucl-tharXiv:nucl-th/9409008

Abstract

We use a boost-invariant one-dimensional (cylindrically symmetric) fluid dynamics code to calculate thermal photon production in the central rapidity region of S+Au and Pb+Pb collisions at SPS energy (s=20 GeV/nucleon). We assume that the hot matter is in thermal equilibrium throughout the expansion, but consider deviations from chemical equilibrium in the high temperature (deconfined) phase. We use equations of state with a first-order phase transition between a massless pion gas and quark gluon plasma, with transition temperatures in the range 150 ≤ Tc ≤ 200 MeV.

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