A1 Journal article (refereed)
Bayesian estimation of the specific shear and bulk viscosity of the quark-gluon plasma with additional flow harmonic observables (2021)

Parkkila, J. E., Önnerstad, A., & Kim, D. J. (2021). Bayesian estimation of the specific shear and bulk viscosity of the quark-gluon plasma with additional flow harmonic observables. Physical Review C, 104(5), Article 054904. https://doi.org/10.1103/PhysRevC.104.054904

JYU authors or editors

Publication details

All authors or editors: Parkkila, J. E.; Önnerstad, A.; Kim, D. J.

Journal or series: Physical Review C

ISSN: 2469-9985

eISSN: 2469-9993

Publication year: 2021

Volume: 104

Issue number: 5

Article number: 054904

Publisher: American Physical Society

Publication country: United States

Publication language: English

DOI: https://doi.org/10.1103/PhysRevC.104.054904

Publication open access: Openly available

Publication channel open access: Partially open access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/78832


The transport properties of the strongly coupled quark-gluon plasma created in ultrarelativistic heavy-ion
collisions are extracted by Bayesian parameter estimate methods with the latest collision beam energy data from
the CERN Large Hadron Collider. This Bayesian analysis includes sophisticated flow harmonic observables for
the first time. We found that the temperature dependence of specific shear viscosity appears weaker than in the
previous studies. The results prefer a lower value of specific bulk viscosity and a higher switching temperature
to reproduce additional observables. However, the improved statistical uncertainties both on the experimental
data and hydrodynamic calculations with additional observables do not help to reduce the final credibility ranges
much, indicating a need for improving the dynamical collision model before the hydrodynamic takes place. In
addition, the sensitivities of experimental observables to the parameters in hydrodynamic model calculations
are quantified. It is found that the analysis benefits most from the symmetric cumulants and nonlinear flow
modes, which mostly reflect nonlinear hydrodynamic responses, in constraining the temperature dependence of
the specific shear and bulk viscosities in addition to the previously used flow coefficients.

Keywords: particle physics; nuclear physics; quark-gluon plasma; Bayesian analysis

Contributing organizations

Ministry reporting: Yes

Reporting Year: 2021

JUFO rating: 2

Last updated on 2022-20-09 at 15:52