Extraction of the specific shear viscosity of quark-gluon plasma from two-particle transverse momentum correlations

Abstract

The specific shear viscosity, $\eta /s$, of the quark-gluon plasma formed in ultrarelativistic heavy-ion collisions at RHIC and LHC is estimated based on the progressive longitudinal broadening of transverse momentum two-particle correlators, $G_2$, reported as a function of collision centrality by the STAR and ALICE experiments. Estimates are computed as a function of collision centrality using the Gavin ansatz which relates the $G_2$ longitudinal broadening to the specific shear viscosity. Freeze out times required for the use of the ansatz are computed using a linear fit of freeze out times reported as a function of the cubic root of the charged particle pseudorapidity density $(\mathrm{d}{N}_{\mathrm{ch}}/\mathrm{d}\eta {)}^{1/3}$. Estimates of $\eta /s$ based on ALICE data exhibit little to no dependence on collision centrality at LHC energy, while estimates obtained from STAR data hint that $\eta /s$ might be a function of collision centrality at top RHIC energy.

4 figures, 7 pages

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Cited by in corpus (7)

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• Shear viscosity of nucleonic matter
• A model investigation of the longitudinal broadening of the transverse momentum two-particle correlator
• Two-particle transverse momentum correlations in pp and p-Pb collisions at energies available at the CERN Large Hadron Collider
• Azimuthal dependence of two-particle transverse momentum current correlations
• Measurements of differential two-particle number and transverse momentum correlation functions in pp collisions at $\sqrt{\text{s}}$ = 13 TeV
• Event-shape dependence of symmetry plane correlations using the Gaussian estimator in Pb-Pb collisions at the LHC using a multiphase transport model