Direct photon spectra and azimuthal anisotropy

descriptionPublicationkeyboard_double_arrow_right Article 01 Jul 2016 English Publisher:Elsevier BVJournal:Nuclear and Particle Physics Proceedings, volume 276-278, pages 341-344 (issn: 2405-6014,

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Authors: Stefan Bathe;

doi: 10.1016/j.nuclphysbps.2016.05.079

Direct photon spectra and azimuthal anisotropy

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Abstract

The transverse momentum distribution and azimuthal anisotropy of direct photon production in Au+Au collisions at sNN=200 GeV were measured in the PHENIX experiment at RHIC. Through the external conversion method, earlier yield and v2 measurements were extended down to pT = 0.4 GeV/c. For the first time the third order Fourier coefficient, v3 was measured. The yield shows a large, exponential excess above prompt photon production. v2 is consistent with that of hadrons at low pT. v3 is about 50% the size of v2. Current models cannot describe simultaneously the large observed yield and azimuthal anisotropy.

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