Beam-energy dependence of correlations between mean transverse momentum and anisotropic flow of charged particles in Au+Au collisions at RHIC

STAR Collaboration

doi:10.1016/j.physletb.2026.140378

Beam-energy dependence of correlations between mean transverse momentum and anisotropic flow of charged particles in Au+Au collisions at RHIC

STAR Collaboration

Institute of Higher Research

Texas A&M University
Czech Technical University in Prague
Joint Institute for Nuclear Research
Panjab University
Variable Energy Cyclotron Centre
Russian Research Centre Kurchatov Institute
Moscow Engineering Physics Institute
Kent State University
Fudan University
Abilene Christian University
Universidad de Tarapacá
Shandong University
Indian Institute of Science Education and Research, Berhampur
University of California at Riverside
Indian Institute of Science Education and Research, Tirupati
University of Jammu
Stony Brook University
Ohio State University
University of Houston
Chinese Academy of Sciences
Yale University
University of California at Davis
Lawrence Berkeley National Laboratory
Purdue University
Indiana University Bloomington
National Institute of Technology, Durgapur
Central China Normal University
Guangxi Normal University
Tsinghua University
University of California at Los Angeles
Brookhaven National Laboratory
University of California at Berkeley
Heidelberg University
Institute for High Energy Physics
American University in Cairo
Rice University
University of Tsukuba
University of Illinois at Chicago
University of Kentucky
University of Calabria
Southern Connecticut State University
CAS - Institute of Modern Physics
Valparaiso University
Huzhou University
University of Chinese Academy of Sciences
Academia Sinica Taiwan HQ
National Cheng Kung University
Eötvös Loránd University
University of Science and Technology of China
Sejong University
Wayne State University
Temple University
Lehigh University
Wuhan University of Science and Technology
South China Normal University
Texas Southern University
National Institute of Science Education and Research
Lovely Professional University
Warsaw University of Technology
Rutgers - The State University of New Jersey, New Brunswick
University of Texas at Austin
Max Planck Institute for Physics (Werner Heisenberg Institute)
Creighton University
Indian Institute of Technology Patna
Ball State University
Michigan State University
Argonne National Laboratory
Chongqing University
Lanzhou University
Goethe University Frankfurt

Research output: Contribution to journal › Article › peer-review

Abstract

The correlation between the mean transverse momentum, [p _T], and the squared anisotropic flow, v_n², on an event-by-event basis has been suggested to be influenced by the initial conditions in heavy-ion collisions. We present measurements of the variances and covariance of [p _T] and v_n², along with their dimensionless ratio, for Au+Au collisions at various beam energies: s_NN = 14.6, 19.6, 27, 54.4, and 200 GeV. Our measurements reveal a distinct energy-dependent behavior in the variances and covariances. In addition, the dimensionless ratio displays a similar behavior across different beam energies. We compare our measurements with hydrodynamic models and similar measurements from Pb+Pb collisions at the Large Hadron Collider (LHC). These findings provide valuable insights into the beam energy dependence of the specific shear viscosity (η / s) and initial-state effects, allowing for differentiating between different initial-state models.

Original language	English
Article number	140378
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	876
DOIs	https://doi.org/10.1016/j.physletb.2026.140378
State	Published - May 2026

Keywords

Collectivity
Correlation
Shear viscosity
Transverse momentum correlations

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10.1016/j.physletb.2026.140378

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@article{afbd6af1a0d642bbbeff895fc3331a72,

title = "Beam-energy dependence of correlations between mean transverse momentum and anisotropic flow of charged particles in Au+Au collisions at RHIC",

abstract = "The correlation between the mean transverse momentum, [p T], and the squared anisotropic flow, vn2, on an event-by-event basis has been suggested to be influenced by the initial conditions in heavy-ion collisions. We present measurements of the variances and covariance of [p T] and vn2, along with their dimensionless ratio, for Au+Au collisions at various beam energies: sNN = 14.6, 19.6, 27, 54.4, and 200 GeV. Our measurements reveal a distinct energy-dependent behavior in the variances and covariances. In addition, the dimensionless ratio displays a similar behavior across different beam energies. We compare our measurements with hydrodynamic models and similar measurements from Pb+Pb collisions at the Large Hadron Collider (LHC). These findings provide valuable insights into the beam energy dependence of the specific shear viscosity (η / s) and initial-state effects, allowing for differentiating between different initial-state models.",

keywords = "Collectivity, Correlation, Shear viscosity, Transverse momentum correlations",

author = "Aboona, \{B. E.\} and J. Adam and G. Agakishiev and I. Aggarwal and S. Kabana and \{STAR Collaboration\}",

note = "Publisher Copyright: {\textcopyright} 2026 The Authors.",

year = "2026",

month = may,

doi = "10.1016/j.physletb.2026.140378",

language = "English",

volume = "876",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

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TY - JOUR

T1 - Beam-energy dependence of correlations between mean transverse momentum and anisotropic flow of charged particles in Au+Au collisions at RHIC

AU - Aboona, B. E.

AU - Adam, J.

AU - Agakishiev, G.

AU - Aggarwal, I.

AU - Kabana, S.

AU - STAR Collaboration

PY - 2026/5

Y1 - 2026/5

N2 - The correlation between the mean transverse momentum, [p T], and the squared anisotropic flow, vn2, on an event-by-event basis has been suggested to be influenced by the initial conditions in heavy-ion collisions. We present measurements of the variances and covariance of [p T] and vn2, along with their dimensionless ratio, for Au+Au collisions at various beam energies: sNN = 14.6, 19.6, 27, 54.4, and 200 GeV. Our measurements reveal a distinct energy-dependent behavior in the variances and covariances. In addition, the dimensionless ratio displays a similar behavior across different beam energies. We compare our measurements with hydrodynamic models and similar measurements from Pb+Pb collisions at the Large Hadron Collider (LHC). These findings provide valuable insights into the beam energy dependence of the specific shear viscosity (η / s) and initial-state effects, allowing for differentiating between different initial-state models.

AB - The correlation between the mean transverse momentum, [p T], and the squared anisotropic flow, vn2, on an event-by-event basis has been suggested to be influenced by the initial conditions in heavy-ion collisions. We present measurements of the variances and covariance of [p T] and vn2, along with their dimensionless ratio, for Au+Au collisions at various beam energies: sNN = 14.6, 19.6, 27, 54.4, and 200 GeV. Our measurements reveal a distinct energy-dependent behavior in the variances and covariances. In addition, the dimensionless ratio displays a similar behavior across different beam energies. We compare our measurements with hydrodynamic models and similar measurements from Pb+Pb collisions at the Large Hadron Collider (LHC). These findings provide valuable insights into the beam energy dependence of the specific shear viscosity (η / s) and initial-state effects, allowing for differentiating between different initial-state models.

KW - Collectivity

KW - Correlation

KW - Shear viscosity

KW - Transverse momentum correlations

UR - https://www.scopus.com/pages/publications/105036724783

U2 - 10.1016/j.physletb.2026.140378

DO - 10.1016/j.physletb.2026.140378

M3 - Article

AN - SCOPUS:105036724783

SN - 0370-2693

VL - 876

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

M1 - 140378

ER -

Beam-energy dependence of correlations between mean transverse momentum and anisotropic flow of charged particles in Au+Au collisions at RHIC

Abstract

Keywords

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