203 articles – 1878 Notices  [english version]
 HAL : in2p3-00653198, version 1
 arXiv : 1112.3930
 Physical Review Letters 108 (2011) 202301
 Directed Flow of Identified Particles in Au + Au Collisions at $\sqrtsNN = 200$ GeV at RHIC
 STAR Collaboration(s)
 (2011)
 STAR's measurements of directed flow ($v_1$) around midrapidity for $\pi^{\pm}$, K$^{\pm}$, K$_S^0$, $p$ and $\bar{p}$ in Au + Au collisions at $\sqrtsNN = 200$ GeV are presented. A negative $v_1(y)$ slope is observed for most of produced particles ($\pi^{\pm}$, K$^{\pm}$, K$_{S}^{0}$ and $\bar{p}$). The proton $v_1(y)$ slope is found to be much closer to zero compared to antiprotons. A sizable difference is seen between $v_1$ of protons and antiprotons in 5-30% central collisions. The $v_1$ excitation function is presented. Comparisons to model calculations (RQMD, UrQMD, AMPT, QGSM with parton recombination, and a hydrodynamics model with a tilted source) are made. Anti-flow alone cannot explain the centrality dependence of the difference between the $v_1(y)$ slopes of protons and antiprotons.
 Thème(s) : Physique/Physique Nucléaire Expérimentale
 Lien vers le texte intégral : http://fr.arXiv.org/abs/1112.3930
 in2p3-00653198, version 1 http://hal.in2p3.fr/in2p3-00653198 oai:hal.in2p3.fr:in2p3-00653198 Contributeur : Sylvie Florès <> Soumis le : Lundi 19 Décembre 2011, 09:10:56 Dernière modification le : Mercredi 16 Mai 2012, 07:59:25