Flow fluctuations in Pb plus Pb collisions at √sNN=5.02 TeV with the ATLAS detector



Zhou, Mingliang, Aaboud, M, Aad, G, Abbott, B, Abdinov, O, Abeloos, B, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL
et al (show 2909 more authors) (2019) Flow fluctuations in Pb plus Pb collisions at √sNN=5.02 TeV with the ATLAS detector NUCLEAR PHYSICS A, 982. pp. 323-326. ISSN 0375-9474, 1873-1554

Access the full-text of this item by clicking on the Open Access link.

Abstract

Measurements of four-particle cumulants c n { 4 } for n = 1 , 2 , 3 , 4 are presented using 470 μ b − 1 of Pb+Pb collisions at s NN = 5.02 TeV with the ATLAS detector at the LHC. These cumulants provide information on the event-by-event fluctuations of single harmonics p ( v n ) . For the first time, a negative c 1 { 4 } is observed. The c 4 { 4 } is found to be negative in central collisions but changes sign around 20–25% centrality. This behavior is consistent with a nonlinear contribution to v 4 that is proportional to v 2 2 . c 2 { 4 } and c 3 { 4 } are calculated using two reference event classes in order to investigate the influence of volume fluctuations. Over most of the centrality range, c 2 { 4 } and c 3 { 4 } are found to be negative, while in the ultra-central collisions, c 2 { 4 } changes sign and becomes positive, suggesting a deviation from Gaussian behavior in the event-by-event fluctuation of v 2 . The magnitudes of the sign change are also found to be dependent of the event class definition.

Item Type: Article
Uncontrolled Keywords: Multi-Particle Correlation, Cumulants, Heavy-ion, Flow Fluctuation
Depositing User: Symplectic Admin
Date Deposited: 07 May 2019 09:05
Last Modified: 16 Jun 2026 05:32
DOI: 10.1016/j.nuclphysa.2018.09.012
Open Access URL: https://doi.org/10.1016/j.nuclphysa.2018.09.012
Related Websites:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3040009
Disclaimer: The University of Liverpool is not responsible for content contained on other websites from links within repository metadata. Please contact us if you notice anything that appears incorrect or inappropriate.