# 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.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00697047
Contributor : Dominique Girod <>
Submitted on : Monday, May 14, 2012 - 2:20:44 PM
Last modification on : Wednesday, August 4, 2021 - 3:54:02 PM

### Citation

H. Agakishiev, W. Borowski, Magali Estienne, S. Kabana. Evolution of the differential transverse momentum correlation function with centrality in Au+Au collisions at $\sqrt{s_{NN}} = 200$ GeV. Physics Letters B, Elsevier, 2011, 704, pp.467-473. ⟨10.1016/j.physletb.2011.09.075⟩. ⟨in2p3-00697047⟩

Record views