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

Summary, in English

The specific shear viscosity, η/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, G2, 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 G2 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
(dNch/dη)1/3. Estimates of η/s based on ALICE data
exhibit little to no dependence on collision centrality at LHC energy, while
estimates obtained from STAR data hint that η/s might be a function of
collision centrality at top RHIC energy.

• Author: Victor Gonzalez; Sumit Basu; Pedro Ladron de Guevara; Ana Marin; Jinjin Pan; Claude A. Pruneau
• Department/s: Particle and nuclear physics
• Publishing year: 2020-12-18
• Language: English
• Links: https://arxiv.org/pdf/2012.10542.pdf
• Document type: Preprint
• Publisher: arXiv.org
• Topic: Subatomic Physics
• Status: Published