Charged and strange hadron elliptic flow in Cu+Cu collisions at sNN=62.4 and 200 GeV
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We present the results of an elliptic flow, v2, analysis of Cu+Cu collisions recorded with the solenoidal tracker detector (STAR) at the BNL Relativistic Heavy Ion Collider at √sNN=62.4 and 200 GeV. Elliptic flow as a function of transverse momentum, v2(pT), is reported for different collision centralities for charged hadrons h± and strangeness-ontaining hadrons KS0, Λ, Ξ, and Φ in the midrapidity region |η|<1.0. Significant reduction in systematic uncertainty of the measurement due to nonflow effects has been achieved by correlating particles at midrapidity, |η|<1.0, with those at forward rapidity, 2.5<|η|<4.0. We also present azimuthal correlations in p+p collisions at √s=200 GeV to help in estimating nonflow effects. To study the system-size dependence of elliptic flow, we present a detailed comparison with previously published results from Au+Au collisions at √sNN=200 GeV. We observe that v2(pT) of strange hadrons has similar scaling properties as were first observed in Au+Au collisions, that is, (i) at low transverse momenta, pT<2GeV/c, v2 scales with transverse kinetic energy, mT-m, and (ii) at intermediate pT, 2
author list (cited authors)
Abelev, B. I., Aggarwal, M. M., Ahammed, Z., Alakhverdyants, A. V., Alekseev, I., Anderson, B. D., ... Zoulkarneeva, Y.