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

Adare, A.

doi:10.1103/PhysRevC.91.044907

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

Journal Article · Tue Apr 28 00:00:00 EDT 2015 · Physical Review. C. Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.91.044907· OSTI ID:1213358

Adare, A. ^[1]

Univ. of Colorado, Boulder, CO (United States). et al.

Here, 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 √s_NN = 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 < p^e_T < 2.5 GeV/c for 0%–40% centrality collisions at √s_NN = 62.4 GeV. For 20%–40% centrality collisions, the v₂ at √s_NN = 62.4 GeV is smaller than that for heavy-flavor decays at √s_NN = 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 √s_NN = 200 GeV.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: SC00112704; AC05-00OR22725

OSTI ID:: 1213358

Alternate ID(s):: OSTI ID: 1180932; OSTI ID: 1338502

Report Number(s):: BNL-108103-2015-JA; PRVCAN; KB0201021

Journal Information:: Physical Review. C. Nuclear Physics, Vol. 91, Issue 4; ISSN 0556-2813

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 18 works

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