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

  • Author(s): Adamczyk, L;
  • Adkins, JK;
  • Agakishiev, G;
  • Aggarwal, MM;
  • Ahammed, Z;
  • Ajitanand, NN;
  • Alekseev, I;
  • Anderson, DM;
  • Aoyama, R;
  • Aparin, A;
  • Arkhipkin, D;
  • Aschenauer, EC;
  • Ashraf, MU;
  • Attri, A;
  • Averichev, GS;
  • Bai, X;
  • Bairathi, V;
  • Behera, A;
  • Bellwied, R;
  • Bhasin, A;
  • Bhati, AK;
  • Bhattarai, P;
  • Bielcik, J;
  • Bielcikova, J;
  • Bland, LC;
  • Bordyuzhin, IG;
  • Bouchet, J;
  • Brandenburg, JD;
  • Brandin, AV;
  • Brown, D;
  • Bunzarov, I;
  • Butterworth, J;
  • Caines, H;
  • Calderón De La Barca Sánchez, M;
  • Campbell, JM;
  • Cebra, D;
  • Chakaberia, I;
  • Chaloupka, P;
  • Chang, Z;
  • Chankova-Bunzarova, N;
  • Chatterjee, A;
  • Chattopadhyay, S;
  • Chen, X;
  • Chen, JH;
  • Chen, X;
  • Cheng, J;
  • Cherney, M;
  • Christie, W;
  • Contin, G;
  • Crawford, HJ;
  • Das, S;
  • De Silva, LC;
  • Debbe, RR;
  • Dedovich, TG;
  • Deng, J;
  • Derevschikov, AA;
  • Didenko, L;
  • Dilks, C;
  • Dong, X;
  • Drachenberg, JL;
  • Draper, JE;
  • Dunkelberger, LE;
  • Dunlop, JC;
  • Efimov, LG;
  • Elsey, N;
  • Engelage, J;
  • Eppley, G;
  • Esha, R;
  • Esumi, S;
  • Evdokimov, O;
  • Ewigleben, J;
  • Eyser, O;
  • Fatemi, R;
  • Fazio, S;
  • Federic, P;
  • Federicova, P;
  • Fedorisin, J;
  • Feng, Z;
  • Filip, P;
  • Finch, E;
  • Fisyak, Y;
  • Flores, CE;
  • Fulek, L;
  • Gagliardi, CA;
  • Garand, D;
  • Geurts, F;
  • Gibson, A;
  • Girard, M;
  • Grosnick, D;
  • Gunarathne, DS;
  • Guo, Y;
  • Gupta, S;
  • Gupta, A;
  • Guryn, W;
  • Hamad, AI;
  • Hamed, A;
  • Harlenderova, A;
  • Harris, JW;
  • He, L;
  • Heppelmann, S
  • et al.
Abstract

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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