Heavy-quark production and elliptic flow in Au + Au collisions at √sNN = 62.4 GeV

Adare, A. and Makek, Mihael and Zelenski, A. (PHENIX Collaboration) (2015) Heavy-quark production and elliptic flow in Au + Au collisions at √sNN = 62.4 GeV. Physical Review C, 91 (4). pp. 44907-19. ISSN 0556-2813

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We present measurements of electrons and positrons from the semileptonic decays of heavy-flavor hadrons at midrapidity (|y| < 0.35) in Au + Au collisions at √sNN = 62.4 GeV. The data were collected in 2010 by the PHENIX experiment that included the new hadron-blind detector. The invariant yield of electrons from heavy-flavor decays is measured as a function of transverse momentum in the range 1 < p^e_T < 5 GeV/c. The invariant yield per binary collision is slightly enhanced above the p + p reference in Au + Au 0%–20%, 20%–40%, and 40%–60% centralities at a comparable level. At this low beam energy this may be a result of the interplay between initial-state Cronin effects, final-state flow, and energy loss in medium. The v2 of electrons from heavy-flavor decays is nonzero when averaged between 1.3 < pe^_T < 2.5 GeV/c for 0%–40% centrality collisions at √sNN = 62.4 GeV. For 20%–40% centrality collisions, the v2 at √sNN = 62.4 GeV is smaller than that for heavy-flavor decays at √sNN = 200 GeV. The v2 of the electrons from heavy-flavor decay at the lower beam energy is also smaller than v2 for pions. Both results indicate that the heavy quarks interact with the medium formed in these collisions, but they may not be at the same level of thermalization with the medium as observed at √sNN = 200 GeV.

Item Type: Article
Date: 28 April 2015
Subjects: NATURAL SCIENCES > Physics > Nuclear Physics
Additional Information: Copyright (2015) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 11 Jun 2015 09:56
Last Modified: 11 Jun 2015 09:56
URI: http://digre.pmf.unizg.hr/id/eprint/4037

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