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We present the results for direct photon and neutral pion production obtainedfrom proton-proton and lead-lead collisions in the ALICE experiment.Measurement of neutral pions in pp collisions allows to test the validity ofQCD-inspired models. The study of neutral pion yields in Pb-Pb collisionspermits to study the medium-induced suppression relative to the pp case. Theyield of direct photons is compared to perturbative QCD calculations. In thecase of central Pb-Pb collisions the observed excess of photons below 4 GeV/cis used to find the effective temperature of the matter.

Photon and neutral pion production in pp and Pb-Pb collisions at LHC energies in the ALICE experiment