学術雑誌論文 Elliptic flow of electrons from heavy-flavor hadron decays in Au + Au collisions at √ sNN = 200, 62.4, and 39 GeV

STAR Collaboration  ,  Esumi, S.

95 ( 3 )  , p.34907 , 2017-03 , American Physical Society
ISSN:2469-9985
NII書誌ID(NCID):AA00773613
内容記述
We present measurements of elliptic flow (v2) of electrons from the decays of heavy-flavor hadrons (eHF) by the STAR experiment. For Au+Au collisions at √sNN=200 GeV we report v2, for transverse momentum (pT) between 0.2 and 7 GeV/c, using three methods: the event plane method (v2{EP}), two-particle correlations (v2{2}), and four-particle correlations (v2{4}). For Au+Au collisions at √sNN=62.4 and 39 GeV we report v2{2} for pT<2GeV/c. v2{2} and v2{4} are nonzero at low and intermediate pT at 200 GeV, and v2{2} is consistent with zero at low pT at other energies. The v2{2} at the two lower beam energies is systematically lower than at √sNN=200 GeV for pT<1GeV/c. This difference may suggest that charm quarks interact less strongly with the surrounding nuclear matter at those two lower energies compared to √sNN=200 GeV.
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