HAL : in2p3-00697047, version 1

arXiv : 1106.4334

DOI : 10.1016/j.physletb.2011.09.075

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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

H. Agakishiev, W. Borowski1, M. Estienne1, S. Kabana1

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.

1 :	SUBATECH - Laboratoire SUBATECH Nantes

Thème(s)

:

Physique/Physique Nucléaire Expérimentale

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Contributeur : Dominique Girod <>

Soumis le : Lundi 14 Mai 2012, 14:20:44

Dernière modification le : Lundi 14 Mai 2012, 15:08:47