Longitudinal De-correlation of Anisotropic Flow in Au+Au Collisions at $\sqrt{s_{NN}}$ = 27 and 54.4 GeV from STAR

5 Nov 2019, 09:00
20m
Ball Room 1 (Wanda Reign Wuhan Hotel)

Ball Room 1

Wanda Reign Wuhan Hotel

Oral Presentation Collective dynamics and final state interaction Parallel Session - Collective dynamics I

Speaker

Maowu Nie for the STAR Collaboration (Shandong University (SDU) & Stony Brook University)

Description

Studies of longitudinal de-correlation of anisotropic flow provide unique constraints on the initial conditions and dynamical evolution of the quark-gluon-plasma in heavy-ion collisions. With data collected by the STAR experiment at RHIC, the factorization ratio for flow harmonics, $r_n(\eta^a, \eta^b) (n = 2, 3)$, are obtained over a wide $\eta$ range for 27 and 54.4 GeV Au+Au collisions as a function of centrality and transverse momentum. Comparing to results from LHC and 200 GeV Au+Au collisions, we observe a clear collision-energy dependence indicating a stronger longitudinal de-correlation at lower collision energies. The results provide new insights into the three-dimensional modeling of the evolution of relativistic heavy-ion collisions and the shear viscosity of the QGP, especially their collision energy dependence. Comparison with the hydrodynamic model calculations will be included.

Primary author

Maowu Nie for the STAR Collaboration (Shandong University (SDU) & Stony Brook University)

Presentation Materials