2015年4月
Heavy-quark production and elliptic flow in Au plus Au collisions at root(NN)-N-S=62.4 GeV
PHYSICAL REVIEW C
- 巻
- 91
- 号
- 4
- 記述言語
- 英語
- 掲載種別
- 機関テクニカルレポート,技術報告書,プレプリント等
- DOI
- 10.1103/PhysRevC.91.044907
- 出版者・発行元
- AMER PHYSICAL SOC
We present measurements of electrons and positrons from the semileptonic decays of heavy-flavor hadrons at midrapidity (vertical bar gamma vertical bar < 0.35) in Au + Au collisions at root(NN)-N-S = 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(T)(e) < 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 v(2) of electrons from heavy-flavor decays is nonzero when averaged between 1.3 < p(T)(e) < 2.5 GeV/c for 0%-40% centrality collisions at root(NN)-N-S = 62.4 GeV. For 20%-40% centrality collisions, the v(2) at root(NN)-N-S = 62.4 GeV is smaller than that for heavy-flavor decays at root(NN)-N-S = 200 GeV. The v2 of the electrons from heavy-flavor decay at the lower beam energy is also smaller than v(2) 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 root(NN)-N-S = 200 GeV.
- リンク情報
-
- DOI
- https://doi.org/10.1103/PhysRevC.91.044907
- arXiv
- http://arxiv.org/abs/arXiv:1405.3301
- Web of Science
- https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000353545200001&DestApp=WOS_CPL
- URL
- http://arxiv.org/abs/1405.3301v3
- ID情報
-
- DOI : 10.1103/PhysRevC.91.044907
- ISSN : 2469-9985
- eISSN : 2469-9993
- arXiv ID : arXiv:1405.3301
- Web of Science ID : WOS:000353545200001