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

2015/11/01 by Podist Kurashvili, Kurashvili, Podist
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #Nuclear Experiment (nucl-ex) #hep-ex #nucl-ex

paper · pdf · doi:10.48550/arxiv.1511.00306

Talk presented at LISHEP 2015, 14 pages, 15 figures

arxiv created 2015/11/01 · arxiv updated 2015/11/16

Abstract

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

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