Evolution of the differential transverse momentum correlation function with centrality in Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV

Abstract

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.

7 pages, 4 figures, STAR paper published in Phys. Lett. B

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