In this study, 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 < peT < 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 < peT < 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.
Adare, A.. "Heavy-quark production and elliptic flow in Au+Au collisions at √s<sub>NN</sub>=62.4 GeV." Physical Review. C. Nuclear Physics, vol. 91, no. 4, Apr. 2015. https://doi.org/10.1103/PhysRevC.91.044907
Adare, A. (2015). Heavy-quark production and elliptic flow in Au+Au collisions at √s<sub>NN</sub>=62.4 GeV. Physical Review. C. Nuclear Physics, 91(4). https://doi.org/10.1103/PhysRevC.91.044907
Adare, A., "Heavy-quark production and elliptic flow in Au+Au collisions at √s<sub>NN</sub>=62.4 GeV," Physical Review. C. Nuclear Physics 91, no. 4 (2015), https://doi.org/10.1103/PhysRevC.91.044907
@article{osti_1213358,
author = {Adare, A.},
title = {Heavy-quark production and elliptic flow in Au+Au collisions at √s<sub>NN</sub>=62.4 GeV},
annote = {In this study, we present measurements of electrons and positrons from the semileptonic decays of heavy-flavor hadrons at midrapidity (|y|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 eT eT NN = 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.},
doi = {10.1103/PhysRevC.91.044907},
url = {https://www.osti.gov/biblio/1213358},
journal = {Physical Review. C. Nuclear Physics},
issn = {ISSN PRVCAN},
number = {4},
volume = {91},
place = {United States},
publisher = {American Physical Society (APS)},
year = {2015},
month = {04}}
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