Direct photon elliptic flow in Pb–Pb collisions at √sNN=2.76 TeV

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Abstract

The elliptic flow of inclusive and direct photons was measured at mid-rapidity in two centrality classes 0–20% and 20–40% in Pb–Pb collisions at √sNN=2.76TeV by ALICE. Photons were detected with the highly segmented electromagnetic calorimeter PHOS and via conversions in the detector material with the e+e−pairs reconstructed in the central tracking system. The results of the two methods were combined and the direct-photon elliptic flow was extracted in the transverse momentum range 0.9 <pT<6.2GeV/c. A comparison to RHIC data shows a similar magnitude of the measured direct-photon elliptic flow. Hydrodynamic and transport model calculations are systematically lower than the data, but are found to be compatible.

Journal

  • Physics letters. B

    Physics letters. B (789), 308-322, 2019-02

    Elsevier

Keywords

Codes

  • NII Article ID (NAID)
    120006714122
  • NII NACSIS-CAT ID (NCID)
    AA00774026
  • Text Lang
    ENG
  • Article Type
    journal article
  • ISSN
    0370-2693
  • Data Source
    IR 
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