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Title: Moving Forward to Constrain the Shear Viscosity of QCD Matter

In this work, we demonstrate that measurements of rapidity differential anisotropic flow in heavy-ion collisions can constrain the temperature dependence of the shear viscosity to entropy density ratio η/s of QCD matter. Comparing results from hydrodynamic calculations with experimental data from the RHIC, we find evidence for a small η/s ≈ 0.04 in the QCD crossover region and a strong temperature dependence in the hadronic phase. A temperature independent η/s is disfavored by the data. We further show that measurements of the event-by-event flow as a function of rapidity can be used to independently constrain the initial state fluctuations in three dimensions and the temperature dependent transport properties of QCD matter.
Authors:
 [1] ;  [2] ;  [1]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States). Physics Department
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). RIKEN BNL Research Center
Publication Date:
Report Number(s):
BNL-112315-2016-JA
Journal ID: ISSN 0031-9007; R&D Project: PO-3
Grant/Contract Number:
SC0012704; AC02-05CH11231
Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 116; Journal Issue: 21; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Research Org:
Brookhaven National Lab. (BNL), Upton, NY (United States). RIKEN Research Center
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Riken BNL Research Center
OSTI Identifier:
1336048
Alternate Identifier(s):
OSTI ID: 1254538

Denicol, Gabriel, Monnai, Akihiko, and Schenke, Björn. Moving Forward to Constrain the Shear Viscosity of QCD Matter. United States: N. p., Web. doi:10.1103/PhysRevLett.116.212301.
Denicol, Gabriel, Monnai, Akihiko, & Schenke, Björn. Moving Forward to Constrain the Shear Viscosity of QCD Matter. United States. doi:10.1103/PhysRevLett.116.212301.
Denicol, Gabriel, Monnai, Akihiko, and Schenke, Björn. 2016. "Moving Forward to Constrain the Shear Viscosity of QCD Matter". United States. doi:10.1103/PhysRevLett.116.212301. https://www.osti.gov/servlets/purl/1336048.
@article{osti_1336048,
title = {Moving Forward to Constrain the Shear Viscosity of QCD Matter},
author = {Denicol, Gabriel and Monnai, Akihiko and Schenke, Björn},
abstractNote = {In this work, we demonstrate that measurements of rapidity differential anisotropic flow in heavy-ion collisions can constrain the temperature dependence of the shear viscosity to entropy density ratio η/s of QCD matter. Comparing results from hydrodynamic calculations with experimental data from the RHIC, we find evidence for a small η/s ≈ 0.04 in the QCD crossover region and a strong temperature dependence in the hadronic phase. A temperature independent η/s is disfavored by the data. We further show that measurements of the event-by-event flow as a function of rapidity can be used to independently constrain the initial state fluctuations in three dimensions and the temperature dependent transport properties of QCD matter.},
doi = {10.1103/PhysRevLett.116.212301},
journal = {Physical Review Letters},
number = 21,
volume = 116,
place = {United States},
year = {2016},
month = {5}
}