Jan 10 – 15, 2021
Weizmann Institute of Science
Asia/Jerusalem timezone
See you at IS2023 in Copenhagen in June 2023

Measurements of longitudinal decorrelation of anisotropic flow in 27, 54.4 and 200 GeV Au+Au collisions from STAR

Jan 11, 2021, 7:40 PM
1h 30m
Patio (vDLCC)



bullet talk (poster) Collective dynamics from small to large systems Poster


Maowu Nie (Shandong University (SDU))


Studies of longitudinal decorrelation 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, rn(η, ηref )(n = 2,3), are obtained over a wide η range for 27, 54.4 and 200 GeV Au+Au collisions as a function of centrality. We observe a clear collision energy dependence indicating a stronger longitudinal decorrelation at lower collision energies. The 4-particle correlator (Rn(η, ηref )(n = 2, 3)) used to separate the event-plane twist from vn magnitude fluctuations, will also be presented. The results provide new insights into the three-dimensional modeling of the initial stage and the evolution of relativistic heavy-ion collisions, especially their collision energy dependence.

Primary author

Maowu Nie (Shandong University (SDU))

Presentation materials