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

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.

7 pages, 4 figures, STAR paper published in Phys. Lett. B

References in corpus (13)

• Viscosity in Strongly Interacting Quantum Field Theories from Black Hole Physics
• Systematic Measurements of Identified Particle Spectra in pp, d+Au and Au+Au Collisions from STAR
• Scaling properties of azimuthal anisotropy in Au+Au and Cu+Cu collisions at sqrt(s_NN) = 200 GeV
• Has the QCD Critical Point been Signaled by Observations at RHIC ?
• Measuring Shear Viscosity Using Transverse Momentum Correlations in Relativistic Nuclear Collisions
• On the Origin of the "Ridge" phenomenon induced by Jets in Heavy Ion Collisions
• Indications of Conical Emission of Charged Hadrons at the BNL Relativistic Heavy Ion Collider
• Growth of Long Range Forward-Backward Multiplicity Correlations with Centrality in Au+Au Collisions at $\sqrt{s_{NN}}$ = 200 GeV
• Longitudinal Broadening of Quenched Jets in Turbulent Color Fields
• Beam-Energy and System-Size Dependence of Dynamical Net Charge Fluctuations
• Methods for the Study of Transverse Momentum Differential Correlations
• Dependence of Ridge Formation on Trigger Azimuth: Correlated Emission Model
• Studies of di-jet survival and surface emission bias in Au+Au collisions via angular correlations with respect to back-to-back leading hadrons

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