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

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

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 co...

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Bibliographic Details
Main Authors: Betancourt, Michael Joseph, Balewski, Jan T., Corliss, Ross Cameron, Hays-Wehle, James Prewitt, Leight, William Axel, Milner, Richard G, Redwine, Robert P, Seele, Joseph Patrick, Steadman, Stephen G, Surrow, Bernd, van Nieuwenhuizen, Gerrit J, Walker, Matthew H
Other Authors: Massachusetts Institute of Technology. Department of Physics
Format: Article
Published: Elsevier BV 2018
Online Access:http://hdl.handle.net/1721.1/117003
https://orcid.org/0000-0002-5515-4563
https://orcid.org/0000-0002-0031-1963
https://orcid.org/0000-0002-9107-6312
https://orcid.org/0000-0001-5839-707X
Description
Summary: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. Keywords: Azimuthal correlations, QGP, Heavy ion collisions

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