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

Gonzalez, Victor ; Basu, Sumit LU orcid ; Marin, Ana ; Pan, Jinjin ; Ladron de Guevara, Pedro and Pruneau, Claude A. (2021) In European Physical Journal C 81(5).
Abstract

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 (d Nch/dη) 1 / 3.... (More)

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 (d Nch/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.

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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
European Physical Journal C
volume
81
issue
5
article number
465
publisher
Springer
external identifiers
  • scopus:85106977960
ISSN
1434-6044
DOI
10.1140/epjc/s10052-021-09260-z
language
English
LU publication?
yes
id
64d03f7a-cfcb-45eb-a4a3-9d360aef245a
date added to LUP
2022-05-12 08:50:16
date last changed
2023-04-11 02:29:07
@article{64d03f7a-cfcb-45eb-a4a3-9d360aef245a,
  abstract     = {{<p>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, G<sub>2</sub>, 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<sub>2</sub> 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 N<sub>ch</sub>/dη) <sup>1 / 3</sup>. 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.</p>}},
  author       = {{Gonzalez, Victor and Basu, Sumit and Marin, Ana and Pan, Jinjin and Ladron de Guevara, Pedro and Pruneau, Claude A.}},
  issn         = {{1434-6044}},
  language     = {{eng}},
  number       = {{5}},
  publisher    = {{Springer}},
  series       = {{European Physical Journal C}},
  title        = {{Extraction of the specific shear viscosity of quark-gluon plasma from two-particle transverse momentum correlations}},
  url          = {{http://dx.doi.org/10.1140/epjc/s10052-021-09260-z}},
  doi          = {{10.1140/epjc/s10052-021-09260-z}},
  volume       = {{81}},
  year         = {{2021}},
}