A method for studying the rapidity fluctuation and decorrelation of harmonic flow in heavy-ion collisions
Abstract
An "event-shape twist" technique is proposed to study the longitudinal dynamics of harmonic flow, in particular the effects of rapidity fluctuation and event-plane decorrelation. This technique can distinguish between two types of rapidity decorrelation effects: a systematic rotation versus a random fluctuation of flow angles along the rapidity direction. The technique is demonstrated and the magnitude of the two decorrelation effects is predicted using the AMPT model via a single particle analysis and two-particle correlation analysis. An observed decorrelation can be attributed to a systematic rotation of event-plane angle along the pseudorapidity, consistent with a collective response to an initial state twist of the fireball proposed by Bozek {\it et.al.}. This rotation is also observed for several higher-order harmonics with the same sign and similar magnitudes.
Keywords
Cite
@article{arxiv.1402.6680,
title = {A method for studying the rapidity fluctuation and decorrelation of harmonic flow in heavy-ion collisions},
author = {Jiangyong Jia and Peng Huo},
journal= {arXiv preprint arXiv:1402.6680},
year = {2014}
}
Comments
7 pages, 9 figures