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SUMMARY:Direct photon and neutral pion production in pp\, p-Pb and Pb-Pb c
 ollisions measured with the ALICE experiment at LHC
DTSTART;VALUE=DATE-TIME:20161013T134500Z
DTEND;VALUE=DATE-TIME:20161013T140500Z
DTSTAMP;VALUE=DATE-TIME:20260714T032423Z
UID:indico-contribution-713@cern.ch
DESCRIPTION:Speakers: Dmitri Peresunko (Kurchatov Institute)\nMeasurements
  of direct photon and neutral pion production in heavy-ion collisions prov
 ide a comprehensive set of observables characterizing properties of the ho
 t QCD medium. Unlike hadrons\, direct photons are produced in all stages o
 f a nucleus-nucleus collision and therefore probe the initial state of the
  collision as well as the space-time evolution of the produced medium. Pro
 mpt direct photons provide means to control the initial stage of the colli
 sion and ensure that the yield suppression of hard hadrons and in particul
 ar neutral pions in Pb-Pb collision is a final-state effect and should be 
 attributed to the parton energy loss in the hot medium. The thermal direct
  photon spectrum and flow carry information about temperature and space-ti
 me evolution of the emitting medium. Measurements of neutral meson spectra
  in pp collisions at energies $\\sqrt{s}$=0.9\, 2.76\, 7 TeV serve a refer
 ence for heavy-ion collisions\, and also provide valuable data for pQCD ca
 lculations and for studying scaling properties of hadron\nproduction at th
 e LHC energies. \n\nThe ALICE experiment at LHC reconstructs photons via c
 omplementary methods\, using the ALICE electromagnetic calorimeters and th
 e central tracking system identifying photons converted to $e^+e^-$ pairs 
 in the material of the inner barrel detectors. Neutral pions are reconstru
 cted using their two-photon decays. Since calorimetric and tracking approa
 ches have practically independent systematic uncertainties\, their compari
 son provides a strong cross-check. In this talk\, we review recent ALICE r
 esults on neutral pion and direct photon production in pp\, p-Pb and Pb-Pb
  collisions.\n\nhttps://indico.particle.mephi.ru/event/4/contributions/713
 /
LOCATION:Milan Hotel Vivaldi-Boccerini
URL:https://indico.particle.mephi.ru/event/4/contributions/713/
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