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

ALICE Collaboration; S. Acharya; H.A. Andrews; D. Evans; K.L. Graham; O. Jevons; P.G. Jones; A. Jusko; M. Krivda; J. Kvapil; R. Lietava; O. Villalobos Baillie; E. Willsher; N. Zardoshti

doi:10.1016/j.physletb.2018.11.039

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

ALICE Collaboration, S. Acharya, H.A. Andrews, D. Evans, K.L. Graham, O. Jevons, P.G. Jones, A. Jusko, M. Krivda, J. Kvapil, R. Lietava, O. Villalobos Baillie, E. Willsher, N. Zardoshti

Physics and Astronomy

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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=2.76 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 < 6.2 GeV/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.

Original language	English
Pages (from-to)	308-322
Number of pages	15
Journal	Physics Letters B
Volume	789
Early online date	23 Nov 2018
DOIs	https://doi.org/10.1016/j.physletb.2018.11.039
Publication status	Published - 10 Feb 2019

ASJC Scopus subject areas

Nuclear and High Energy Physics

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ALICE_collaboration_Direct_photon_elliptic_flow_in_PbPb_collisions_at_√sNN_=_2.76_TeVPhysics_Letters_B_2018
ALICE collaboration (2018) Direct photon elliptic flow in Pb–Pb collisions at √sNN = 2.76 TeV, Physics Letters B, volume 789, pages 308-322, https://doi.org/10.1016/j.physletb.2018.11.039
Final published version, 985 KBLicence: Creative Commons: Attribution (CC BY)

http://www.sciencedirect.com/science/article/pii/S0370269318308815Licence: Creative Commons: Attribution (CC BY)

Cite this

ALICE Collaboration, Acharya, S., Andrews, H. A., Evans, D., Graham, K. L., Jevons, O., Jones, P. G., Jusko, A., Krivda, M., Kvapil, J., Lietava, R., Villalobos Baillie, O., Willsher, E., & Zardoshti, N. (2019). Direct photon elliptic flow in Pb–Pb collisions at √s_NN = 2.76 TeV. Physics Letters B, 789, 308-322. Advance online publication. https://doi.org/10.1016/j.physletb.2018.11.039

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

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 < 6.2 GeV/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. ",

author = "{ALICE Collaboration} and S. Acharya and H.A. Andrews and D. Evans and K.L. Graham and O. Jevons and P.G. Jones and A. Jusko and M. Krivda and J. Kvapil and R. Lietava and {Villalobos Baillie}, O. and E. Willsher and N. Zardoshti",

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T1 - Direct photon elliptic flow in Pb–Pb collisions at √sNN = 2.76 TeV

AU - ALICE Collaboration

AU - Acharya, S.

AU - Andrews, H.A.

AU - Evans, D.

AU - Graham, K.L.

AU - Jevons, O.

AU - Jones, P.G.

AU - Jusko, A.

AU - Krivda, M.

AU - Kvapil, J.

AU - Lietava, R.

AU - Villalobos Baillie, O.

AU - Willsher, E.

AU - Zardoshti, N.

PY - 2019/2/10

Y1 - 2019/2/10

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AB - 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 < 6.2 GeV/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.

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