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

Evolution of the differential transverse momentum correlation function with centrality in Au + Au collisions at s N N = 200   GeV,10.1016/j.physletb.2

Evolution of the differential transverse momentum correlation function with centrality in Au + Au collisions at s N N = 200   GeV  
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G. Agakishiev, M. M. Aggarwal, Z. Ahammed, A. V. Alakhverdyants, I. Alekseev, J. Alford, B. D. Anderson, C. D. Anson, D. Arkhipkin, G. S. Averichev, J. Balewski, D. R. Beavishttp://academic.research.microsoft.com/io.ashx?type=5&id=49359463&selfId1=0&selfId2=0&maxNumber=12&query=
We present first measurements of the evolution of the differential transverse momentum correlation function, C, with collision centrality in Au+Au interactions at sNN=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.
Journal: Physics Letters B - PHYS LETT B , vol. 704, no. 5, pp. 467-473, 2011
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