ALICE potential for direct photon measurements in p-p and Pb-Pb collisions

Details ALICE potential for direct photon measurements in p-p and Pb-Pb collisions ALICE potential for direct photon measurements in p-p and Pb-Pb collisions

2011-01-06

arxiv.org/abs/1101.1244v2

Nucl.Phys.A855:339-342,2011

Physics

High Energy Physics

High Energy Physics - Experiment

Scientific paper

10.1016/j.nuclphysa.2011.02.074

The production of direct photons, not coming from hadron decays, at large transverse momentum pT > 2 GeV/c in proton-proton collisions at the LHC, is an interesting process to test the predictions of perturbative Quantum Chromodynamics at the highest energies ever and to put constraints on the gluon density in the proton. Furthermore, they provide a baseline reference for quark-gluon-plasma studies in Pb-Pb collisions. We will present the experimental capabilities of the ALICE electromagnetic calorimeter EMCal to reconstruct the direct and isolated photon spectra in p-p and Pb-Pb collisions.

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