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 - M.ZyzakThe STAR Collaboration
AU - Aboona, B. E.
AU - Adam, J.
AU - Agakishiev, G.
AU - Aggarwal, I.
AU - Aggarwal, M. M.
AU - Ahammed, Z.
AU - Aitbayev, A.
AU - Alekseev, I.
AU - Alpatov, E.
AU - Alshammri, A. K.
AU - Aparin, A.
AU - Aslam, S.
AU - Atchison, J.
AU - Averichev, G. S.
AU - Bairathi, V.
AU - Bao, X.
AU - Barik, P.
AU - Barish, K.
AU - Behera, S.
AU - Bhagat, P.
AU - Bhasin, A.
AU - Bhatta, S.
AU - Bordyuzhin, I. G.
AU - Brandenburg, J. D.
AU - Brandin, A. V.
AU - Broodo, C.
AU - Cai, X. Z.
AU - Caines, H.
AU - Sánchez, M. Calderón De La Barca
AU - Cebra, D.
AU - Ceska, J.
AU - Chakaberia, I.
AU - Chang, Y. S.
AU - Chang, Z.
AU - Chatterjee, A.
AU - Chen, D.
AU - Chen, J. H.
AU - Chen, L.
AU - Chen, Q.
AU - Chen, W.
AU - Chen, Z.
AU - Cheng, J.
AU - Cheng, Y.
AU - Christie, W.
AU - Chu, X.
AU - Corey, S.
AU - Crawford, H. J.
AU - Deshpande, A.
AU - Jia, J.
AU - Lacey, R.
N1 - Publisher Copyright:
© 2026 The Authors.
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 -