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SUMMARY:Exploring hot QCD matter via direct photons at ALICE
DTSTART;VALUE=DATE-TIME:20181026T073500Z
DTEND;VALUE=DATE-TIME:20181026T075500Z
DTSTAMP;VALUE=DATE-TIME:20260305T195701Z
UID:indico-contribution-1321@cern.ch
DESCRIPTION:Speakers: Dmitri Peresunko (Kurchatov Institute)\nMeasurements
  of direct photon production in heavy-ion collisions provide a unique tool
  to test proton structure and properties of the hot QCD medium. Unlike had
 rons\, direct photons are produced in all stages of a nucleus-nucleus coll
 ision and escape freely from the hot zone. Prompt direct photons can be em
 itted in pp\, p-Pb and Pb-Pb collisions and provide means to test the init
 ial stage of AA collision. The  spectrum and collective flow of thermal di
 rect photons carry information about the temperature and space-time evolut
 ion of the emitting medium.\n\nThe ALICE experiment at LHC reconstructs ph
 otons via complementary methods\, using the ALICE electromagnetic calorime
 ters and the central tracking system identifying photons converted to e+e-
  pairs in the material of the inner barrel detectors. Applying different t
 echniques\, 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 reliab
 le cross-check. In this talk we review recent ALICE results on direct phot
 on production in pp\, pA and AA collisions and compare to available data a
 t SPS and RHIC energies.\n\nhttps://indico.particle.mephi.ru/event/22/cont
 ributions/1321/
LOCATION:Hotel Intourist Kolomenskoye 4* Moskvorechye 1 hall
URL:https://indico.particle.mephi.ru/event/22/contributions/1321/
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