Evolution of the differential transverse momentum correlation function with centrality in Au + Au collisions at
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- 作者：STAR Collaboration ; G. Agakishiev
- 关键词：Azimuthal correlations ; QGP ; Heavy ion collisions
- 刊名：Physics Letters B
- 出版年：2011
- 出版时间：25 October 2011
- 年：2011
- 卷：704
- 期：5
- 页码：467-473
- 全文大小：604 K
文摘
We present first measurements of the evolution of the differential transverse momentum correlation function, C, with collision centrality in Au + Au interactions at . 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, , of the matter formed in central Au + Au interactions. We obtain an upper limit estimate of that suggests that the produced medium has a small viscosity per unit entropy.