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Prompt photons are a powerful tool to study heavy ion collisions. Theirproduction rates provide access to the initial state parton distributionfunctions and also provide a means to calibrate the expected energy of jetsthat are produced in the medium. The ATLAS detector measures photons with itshermetic, longitudinally segmented calorimeter, which gives excellent spatialand energy resolutions, and detailed information about the shower shape of eachmeasured photon. This provides significant rejection against the expectedbackground from the decays of neutral pions in jets. Rejection against jetfragmentation products is further enhanced by requiring candidate photons to beisolated. First results on the spectra of isolated prompt photons from adataset with an integrated luminosity of approximately 0.13 nb^-1 of lead-leadcollisions at sqrt(s_NN)=2.76 TeV are shown as a function of transversemomentum and centrality. The measured spectra are compared to expectations fromperturbative QCD calculations.

Measurement of high p_T isolated prompt photons in lead-lead collisions at sqrt(s_NN)=2.76 TeV with the ATLAS detector at the LHC