Abstract
The number of high transverse momentum photons emitted by a free-streaming quark-gluon plasma created in a collision between heavy nuclei at energies reached at the CERN SPS, BNL RHIC, or CERN LHC is computed assuming a production-time momentum distribution that is exponential. Comparison to a hydrodynamically expanding plasma with the same initial conditions indicates that the photon yield is relatively insensitive to parton rescattering. The expected background coming from the decay of neutral pions is also computed and compared to the direct yield. Direct photons generally dominate decay photons for transverse momenta greater than 5 GeV.
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