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

Author(s)
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; ... Show more Show less
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Abstract
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
Date issued
2011-10
URI
http://hdl.handle.net/1721.1/117003
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal
Physics Letters B
Publisher
Elsevier BV
Citation
Agakishiev, G., et al. “Evolution of the Differential Transverse Momentum Correlation Function with Centrality in Au+Au Collisions at √SNN=200 GeV.” Physics Letters B, vol. 704, no. 5, Oct. 2011, pp. 467–73. © 2011 Elsevier B.V.
Version: Final published version
ISSN
0370-2693

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