Investigating the collision energy dependence of η/s in the beam energy scan at the BNL Relativistic Heavy Ion Collider using Bayesian statistics

Jussi Auvinen (Department of Physics, Duke University, Durham, North Carolina 27708, USA) ; Jonah E. Bernhard (Department of Physics, Duke University, Durham, North Carolina 27708, USA) ; Steffen A. Bass (Department of Physics, Duke University, Durham, North Carolina 27708, USA) ; Iurii Karpenko (INFN - Sezione di Firenze, I-50019 Sesto Fiorentino, Firenze, Italy)

We determine the probability distributions of the shear viscosity over the entropy density ratio η/s in the quark-gluon plasma formed in Au + Au collisions at sNN=19.6,39, and 62.4GeV, using Bayesian inference and Gaussian process emulators for a model-to-data statistical analysis that probes the full input parameter space of a transport + viscous hydrodynamics hybrid model. We find the most likely value of η/s to be larger at smaller sNN, although the uncertainties still allow for a constant value between 0.10 and 0.15 for the investigated collision energy range.

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      "source": "APS", 
      "title": "Investigating the collision energy dependence of <math><mrow><mi>\u03b7</mi><mo>/</mo><mi>s</mi></mrow></math> in the beam energy scan at the BNL Relativistic Heavy Ion Collider using Bayesian statistics"
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      "value": "We determine the probability distributions of the shear viscosity over the entropy density ratio <math><mrow><mi>\u03b7</mi><mo>/</mo><mi>s</mi></mrow></math> in the quark-gluon plasma formed in Au + Au collisions at <math><mrow><msqrt><msub><mi>s</mi><mrow><mi>N</mi><mi>N</mi></mrow></msub></msqrt><mo>=</mo><mn>19.6</mn><mo>,</mo><mspace width=\"0.16em\"></mspace><mn>39</mn></mrow></math>, and <math><mrow><mn>62.4</mn><mspace width=\"0.16em\"></mspace><mi>GeV</mi></mrow></math>, using Bayesian inference and Gaussian process emulators for a model-to-data statistical analysis that probes the full input parameter space of a transport + viscous hydrodynamics hybrid model. We find the most likely value of <math><mrow><mi>\u03b7</mi><mo>/</mo><mi>s</mi></mrow></math> to be larger at smaller <math><msqrt><msub><mi>s</mi><mrow><mi>N</mi><mi>N</mi></mrow></msub></msqrt></math>, although the uncertainties still allow for a constant value between 0.10 and 0.15 for the investigated collision energy range."
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Published on:
13 April 2018
Publisher:
APS
Published in:
Physical Review C , Volume 97 (2018)
Issue 4
DOI:
https://doi.org/10.1103/PhysRevC.97.044905
arXiv:
1706.03666
Copyrights:
Published by the American Physical Society
Licence:
CC-BY-4.0

Fulltext files: