Centrality dependence of charged hadron and strange hadron elliptic flow from sqrt(s_NN) = 200 GeV Au+Au collisions

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dc.creatorSTAR Collaboration
dc.creatorAbelev, B. I.
dc.date2008-01-22
dc.date2008-04-18
dc.date.accessioned2026-07-07T11:39:58Z
dc.date.available2026-07-07T11:39:58Z
dc.descriptionWe present STAR results on the elliptic flow v_2 of charged hadrons, strange and multi-strange particles from sqrt(s_NN) = 200 GeV Au+Au collisions at RHIC. The detailed study of the centrality dependence of v_2 over a broad transverse momentum range is presented. Comparison of different analysis methods are made in order to estimate systematic uncertainties. In order to discuss the non-flow effect, we have performed the first analysis of v_2 with the Lee-Yang Zero method for K_s^0 and Lambda. In the relatively low p_T region, p_T <= 2 GeV/c, a scaling with m_T - m is observed for identified hadrons in each centrality bin studied. However, we do not observe v_2(p_T) scaled by the participant eccentricity to be independent of centrality. At higher p_T, 2 GeV/c <= p_T <= 6 GeV/c, v_2 scales with quark number for all hadrons studied. For the multi-strange hadron Omega, which does not suffer appreciable hadronic interactions, the values of v_2 are consistent with both m_T -m scaling at low p_T and number-of-quark scaling at intermediate p_T. As a function of collision centrality, an increase of p_T-integrated v_2 scaled by the participant eccentricity has been observed, indicating a stronger collective flow in more central Au+Au collisions.
dc.description25 pages, as accepted for Phys. Rev. C. The data tables are at http://drupal.star.bnl.gov/STAR/files/starpublications/108/data.html
dc.identifierhttps://arxiv.org/abs/0801.3466
dc.identifierhttp://arxiv.org/abs/0801.3466
dc.identifierPhys.Rev.C77:054901,2008
dc.identifierdoi:10.1103/PhysRevC.77.054901
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/200115
dc.subjectNuclear Experiment
dc.titleCentrality dependence of charged hadron and strange hadron elliptic flow from sqrt(s_NN) = 200 GeV Au+Au collisions
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