Direct photon elliptic flow in Pb-Pb collisions at root s(NN)=2.76 TeV
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Zimmermann, M. B. and Zinovjev, G. and Zmeskal, J. and Zou, S. and ALICE
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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 root s(NN) = 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(broken vertical bar)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 transverrse momentum range 0.9 < p(T) < 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. (C) 2018 The Author. Published by Elsevier B.V.... Show more Show less