Azimuthally anisotropic emission of low-momentum direct photons in Au + Au collisions at √sNN = 200 GeV

Adare, A. and Makek, Mihael and Zou, L. (PHENIX Collaboration) (2016) Azimuthally anisotropic emission of low-momentum direct photons in Au + Au collisions at √sNN = 200 GeV. Physical Review C, 94. pp. 64901-14. ISSN 2469-9985

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Abstract

The PHENIX experiment at the BNL Relativistic Heavy Ion Collider has measured second- and third-order Fourier coefficients of the azimuthal distributions of direct photons emitted at midrapidity in Au + Au collisions at √sNN = 200 GeV for various collision centralities. Combining two different analysis techniques, results were obtained in the transverse momentum range of 0.4 < pT < 4.0 GeV/c. At low pT the second-order coefficients, v2, are similar to the ones observed in hadrons. Third-order coefficients, v3, are nonzero and almost independent of centrality. These new results on v2 and v3, combined with previously published results on yields, are compared to model calculations that provide yields and asymmetries in the same framework. Those models are challenged to explain simultaneously the observed large yield and large azimuthal anisotropies.

Item Type: Article
Keywords: heavy-ion collision, direct photons, flow
Date: 2016
Subjects: NATURAL SCIENCES > Physics
Additional Information: © 2016 American Physical Society. Received 5 October 2015. Published 6 December 2016.
Divisions: Faculty of Science > Department of Physics
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 16 Sep 2017 12:57
Last Modified: 16 Sep 2017 12:57
URI: http://digre.pmf.unizg.hr/id/eprint/5558

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