Regular Article - Experimental Physics
Extraction of the specific shear viscosity of quark-gluon plasma from two-particle transverse momentum correlations
Department of Physics and Astronomy, Wayne State University, 48201, Detroit, MI, USA
2 Division of Particle Physics, Department of Physics, Lund University, Box 118, 221 00, Lund, Sweden
3 Research Division and ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany
4 Cyclotron Institute, Texas A&M University, 77843, College Station, TX, USA
5 Universidad Complutense de Madrid, Madrid, Spain
6 Instituto de Física, Universidad Nacional Autónoma de México, CP 04510, Mexico City, Mexico
Accepted: 18 May 2021
Published online: 27 May 2021
The specific shear viscosity, , 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, , 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 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 (/d. Estimates of based on ALICE data exhibit little to no dependence on collision centrality at LHC energy, while estimates obtained from STAR data hint that might be a function of collision centrality at top RHIC energy.
© The Author(s) 2021
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