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Evolution of the differential transverse momentum correlation function with centrality in Au + Au collisions at √sNN = 200 GeV

By G. Agakishiev, Mirko Planinić, Nikola Poljak and Y. Zoulkarneeva


We present first measurements of the evolution of the differential transverse momentum correlation function, C, with collision centrality in Au + Au interactions at √sN N = 200 GeV. This observable 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 C with increasing centrality to estimate the ratio of the shear viscosity to entropy density, η/s, of the matter formed in central Au + Au interactions. We obtain an upper limit estimate of η/s that suggests that the produced medium has a small viscosity per unit entropy

Topics: azimuthal correlations, QGP, heavy ion collisions, PRIRODNE ZNANOSTI. Fizika., NATURAL SCIENCES. Physics.
Publisher: 'Elsevier BV'
Year: 2011
DOI identifier: 10.1016/j.physletb.2011.09.075
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