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Beam-energy dependence of the directed flow of deuterons in Au+Au collisions

  • Author(s): Adam, J;
  • Adamczyk, L;
  • Adams, JR;
  • Adkins, JK;
  • Agakishiev, G;
  • Aggarwal, MM;
  • Ahammed, Z;
  • Alekseev, I;
  • Anderson, DM;
  • Aparin, A;
  • Aschenauer, EC;
  • Ashraf, MU;
  • Atetalla, FG;
  • Attri, A;
  • Averichev, GS;
  • Bairathi, V;
  • Barish, K;
  • Behera, A;
  • Bellwied, R;
  • Bhasin, A;
  • Bielcik, J;
  • Bielcikova, J;
  • Bland, LC;
  • Bordyuzhin, IG;
  • Brandenburg, JD;
  • Brandin, AV;
  • Butterworth, J;
  • Caines, H;
  • De La Barca Sánchez, M;
  • Cebra, D;
  • Chakaberia, I;
  • Chaloupka, P;
  • Chan, BK;
  • Chang, FH;
  • Chang, Z;
  • Chankova-Bunzarova, N;
  • Chatterjee, A;
  • Chen, D;
  • Chen, JH;
  • Chen, X;
  • Chen, Z;
  • Cheng, J;
  • Cherney, M;
  • Chevalier, M;
  • Choudhury, S;
  • Christie, W;
  • Chu, X;
  • Crawford, HJ;
  • Csanád, M;
  • Daugherity, M;
  • Dedovich, TG;
  • Deppner, IM;
  • Derevschikov, AA;
  • Didenko, L;
  • Dong, X;
  • Drachenberg, JL;
  • Dunlop, JC;
  • Edmonds, T;
  • Elsey, N;
  • Engelage, J;
  • Eppley, G;
  • Esumi, S;
  • Evdokimov, O;
  • Ewigleben, A;
  • Eyser, O;
  • Fatemi, R;
  • Fazio, S;
  • Federic, P;
  • Fedorisin, J;
  • Feng, CJ;
  • Feng, Y;
  • Filip, P;
  • Finch, E;
  • Fisyak, Y;
  • Francisco, A;
  • Fulek, L;
  • Gagliardi, CA;
  • Galatyuk, T;
  • Geurts, F;
  • Gibson, A;
  • Gopal, K;
  • Grosnick, D;
  • Guryn, W;
  • Hamad, AI;
  • Hamed, A;
  • Harabasz, S;
  • Harris, JW;
  • He, S;
  • He, W;
  • He, XH;
  • Heppelmann, S;
  • Heppelmann, S;
  • Herrmann, N;
  • Hoffman, E;
  • Holub, L;
  • Hong, Y;
  • Horvat, S;
  • Hu, Y;
  • Huang, HZ;
  • Huang, SL
  • et al.
Abstract

We present a measurement of the first-order azimuthal anisotropy v1 of deuterons from Au+Au collisions at sNN=7.7, 11.5, 14.5, 19.6, 27, and 39 GeV recorded with the STAR experiment at the Relativistic Heavy Ion Collider (RHIC). The energy dependence of the v1(y) slope, dv1/dy|y=0, for deuterons, where y is the rapidity, is extracted for semicentral collisions (10%-40% centrality) and compared with that of protons. While the v1(y) slopes of protons are generally negative for sNN>10GeV, those for deuterons are consistent with zero, a strong enhancement of the v1(y) slope of deuterons is seen at the lowest collision energy (the largest baryon density) at sNN=7.7GeV. In addition, we report the transverse momentum dependence of v1 for protons and deuterons. The experimental results are compared with transport and coalescence models.

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