22-26 October 2018
Hotel Intourist Kolomenskoye 4*
Europe/Moscow timezone

Exploring hot QCD matter via direct photons at ALICE

26 Oct 2018, 10:35
Moskvorechye 1 hall (Hotel Intourist Kolomenskoye 4*)

Moskvorechye 1 hall

Hotel Intourist Kolomenskoye 4*

Kashyrskoye shosse, 39B, Moscow, Russia, 115409
Plenary/section talk Nuclear physics: heavy ion Heavy Ion Physics


Dr. Dmitri Peresunko (Kurchatov Institute)


Measurements of direct photon production in heavy-ion collisions provide a unique tool to test proton structure and properties of the hot QCD medium. Unlike hadrons, direct photons are produced in all stages of a nucleus-nucleus collision and escape freely from the hot zone. Prompt direct photons can be emitted in pp, p-Pb and Pb-Pb collisions and provide means to test the initial stage of AA collision. The spectrum and collective flow of thermal direct photons carry information about the temperature and space-time evolution of the emitting medium.

The ALICE experiment at LHC reconstructs photons via complementary methods, using the ALICE electromagnetic calorimeters and the central tracking system identifying photons converted to e+e- pairs in the material of the inner barrel detectors. Applying different techniques, one can measure photons in a wide range of transverse momenta. In addition, since calorimetric and tracking approaches have practically independent systematic uncertainties, their comparison provides a reliable cross-check. In this talk we review recent ALICE results on direct photon production in pp, pA and AA collisions and compare to available data at SPS and RHIC energies.

Primary authors

Presentation Materials

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