Abstract
Direct photon measurements provide a tool for testing QCD predictions in pp collisions and valuable information about properties of the quarkgluon matter created in nucleus-nucleus collisions. Comparing direct photon production in pp, p-Pb and Pb-Pb collisions, one can check the scaling with the number of binary collisions expected at high transverse momentum and get insight into the hot and cold hadronic matter properties with soft photons. The elliptic flow of direct photons is another unique possibility to trace the collective flow formation and space-time evolution of the fireball. We present the latest measurements of direct photon production in pp, p-Pb and Pb-Pb collisions and of the elliptic flow in Pb-Pb collisions at the LHC energies. Comparison to recent theory predictions will be also discussed.
Highlights
By measuring different properties of particles created in the ultra-relativistic nucleus-nucleus collisions, one can study hot quark-gluon matter commonly referred to as quark-gluon plasma (QGP) [1]
Different methods are used in ALICE to reconstruct direct photons: those based on the calorimeters (EMCAL and PHOS) and Photons Conversion method (PCM) using ALICE tracking system
We presented overview ALICE results on direct and isolated photon production in pp, p-Pb a√nd Pb-Pb collisions at Large Hadron Collider (LHC) energies, and direct photon elliptic flow at Pb-Pb collisions at sNN = 2.76 TeV
Summary
By measuring different properties of particles created in the ultra-relativistic nucleus-nucleus collisions, one can study hot quark-gluon matter commonly referred to as quark-gluon plasma (QGP) [1]. Direct photons are those not originating from hadronic decays, but produced in electromagnetic interactions in the course of the collision. Different methods are used in ALICE to reconstruct direct photons: those based on the calorimeters (EMCAL and PHOS) and Photons Conversion method (PCM) using ALICE tracking system. These methods have their advantages at different pT ranges. We present results of direct photon measurements with ALICE detector using data from LHC Run 1
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