Evolution of the differential transverse momentum correlation function with centrality in Au+Au collisions at $\sqrt{s_{NN}} = 200$ GeV - Archive ouverte HAL Access content directly
Journal Articles Physics Letters B Year : 2011

## Evolution of the differential transverse momentum correlation function with centrality in Au+Au collisions at $\sqrt{s_{NN}} = 200$ GeV

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H. Agakishiev
• Function : Author
W. Borowski
• Function : Author
Magali Estienne
S. Kabana
• Function : Author

#### 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.

#### Domains

Physics [physics] Nuclear Experiment [nucl-ex]

### Dates and versions

in2p3-00697047 , version 1 (14-05-2012)

### Identifiers

• HAL Id : in2p3-00697047 , version 1
• ARXIV :
• DOI :

### Cite

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, 2011, 704, pp.467-473. ⟨10.1016/j.physletb.2011.09.075⟩. ⟨in2p3-00697047⟩

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