202 articles – 1867 Notices  [english version]
 HAL : in2p3-00697047, version 1
 arXiv : 1106.4334
 Physics Letters B 704 (2011) 467-473
 Evolution of the differential transverse momentum correlation function with centrality in Au+Au collisions at $\sqrt{s_{NN}} = 200$ GeV
 STAR Collaboration(s)
 (2011)
 We present first measurements of the evolution of the differential transverse momentum correlation function, {\it C}, with collision centrality in Au+Au interactions at $\sqrt{s_{NN}} = 200$ GeV. {\it C} exhibits a strong dependence on collision centrality that is qualitatively similar to that of number correlations previously reported. We use the observed longitudinal broadening of the near-side peak of {\it C} with increasing centrality to estimate the ratio of the shear viscosity to entropy density, $\eta/s$, of the matter formed in central Au+Au interactions. We obtain an upper limit estimate of $\eta/s$ that suggests that the produced medium has a small viscosity per unit entropy.
 Thème(s) : Physique/Physique Nucléaire Expérimentale
 Lien vers le texte intégral : http://fr.arXiv.org/abs/1106.4334
 in2p3-00697047, version 1 http://hal.in2p3.fr/in2p3-00697047 oai:hal.in2p3.fr:in2p3-00697047 Contributeur : Dominique Girod <> Soumis le : Lundi 14 Mai 2012, 14:20:44 Dernière modification le : Lundi 14 Mai 2012, 15:08:47