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

, ; Acharya, S; Adolfsson, Jonatan LU ; Christiansen, Peter LU ; Ljunggren, Martin LU ; Nassirpour, Adrian LU ; Oskarsson, Anders LU ; Richert, Tuva LU ; Silvermyr, David LU and Stenlund, Evert LU , et al. (2019) In Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 789. p.308-322
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=2.76 TeV 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. © 2018 The Author
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Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
volume
789
pages
15 pages
publisher
Elsevier
external identifiers
  • scopus:85059189536
ISSN
0370-2693
DOI
10.1016/j.physletb.2018.11.039
language
English
LU publication?
yes
id
261006a3-834d-4523-a76d-9dab4aed3ff7
date added to LUP
2019-01-22 08:58:41
date last changed
2019-01-27 05:33:54
@article{261006a3-834d-4523-a76d-9dab4aed3ff7,
  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=2.76 TeV 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&lt;pT&lt;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. © 2018 The Author},
  author       = {,  and Acharya, S and Adolfsson, Jonatan and Christiansen, Peter and Ljunggren, Martin and Nassirpour, Adrian and Oskarsson, Anders and Richert, Tuva and Silvermyr, David and Stenlund, Evert and Vislavicius, Vytautas and Zou, S.},
  issn         = {0370-2693},
  language     = {eng},
  pages        = {308--322},
  publisher    = {Elsevier},
  series       = {Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics},
  title        = {Direct photon elliptic flow in Pb–Pb collisions at sNN=2.76 TeV},
  url          = {http://dx.doi.org/10.1016/j.physletb.2018.11.039},
  volume       = {789},
  year         = {2019},
}