Direct photon elliptic flow in Pb–Pb collisions at √sNN=2.76 TeV
Acharya, Shreyasi; Acosta, Fernando Torales; Adamová, Dagmar; Adolfsson, Jonatan; Aggarwal, Madan M.; Aglieri Rinella, Gianluca; Agnello, Michelangelo; Agrawal, Nikita; Ahammed, Zubayer; Ahn, Sang Un; Alme, Johan; Altenkaemper, Lucas; Djuvsland, Øystein; Ersdal, Magnus Rentsch; Fionda, Fiorella Maria Celeste; Nystrand, Joakim; Rehman, Attiq ur; Røhrich, Dieter; Tambave, Ganesh Jagannath; Ullaland, Kjetil; Wagner, Boris; Zhou, Zhuo; Arsene, Ionut Cristian; Bätzing, Paul Christoph; Dordic, Olja; Lardeux, Antoine Xavier; Lindal, Svein; Mahmood, Sohail Musa; Malik, Qasim Waheed; Richter, Matthias; Røed, Ketil; Skaali, Toralf Bernhard; Tveter, Trine Spedstad; Wikne, Jon Christopher; Zhao, Chengxin; Helstrup, Håvard; Hetland, Kristin Fanebust; Kileng, Bjarte; Nesbø, Simon Voigt; Storetvedt, Maksim Melnik; Langøy, Rune; Lien, Jørgen André; Aiola, Salvatore; Akindinov, Alexander; Al-Turany, Mohammed; Alam, Sk Noor; De Albuquerque, Danilo Silva; Aleksandrov, Dimitry; Alessandro, Bruno; Alfaro Molina, José Rubén; ALICE, Collaboration
Journal article, Peer reviewed
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Original versionAcharya, S., Acosta, F. T., Adamová, D., Adolfsson, J., Aggarwal, M. M., Aglieri Rinella, G., . . . Zou, S. (2019). Direct photon elliptic flow in Pb–Pb collisions at √sNN=2.76 TeV. Physics Letters B, 789, 308-322. 10.1016/j.physletb.2018.11.039
The elliptic flow of inclusive and direct photons was measured at mid-rapidity in two centrality classes0–20% and 20–40% in Pb–Pb collisions at √sNN = 2.76 TeV by ALICE. Photons were detected withthe highly segmented electromagnetic calorimeter PHOS and via conversions in the detector materialwith the e+e− pairs reconstructed in the central tracking system. The results of the two methodswere combined and the direct-photon elliptic flow was extracted in the transverse momentum range0.9 < pT < 6.2 GeV/c. A comparison to RHIC data shows a similar magnitude of the measured directphoton elliptic flow. Hydrodynamic and transport model calculations are systematically lower than thedata, but are found to be compatible.