Measurement of longitudinal flow decorrelations in Pb plus Pb collisions at √<i>s</i><sub>NN</sub>=2.76 and 5.02 TeV with the ATLAS detector

Aaboud, M, Aad, G, Abbott, B, Abdinov, O, Abeloos, B, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H, Abreu, H
et al (show 2892 more authors) (2018) Measurement of longitudinal flow decorrelations in Pb plus Pb collisions at √<i>s</i><sub>NN</sub>=2.76 and 5.02 TeV with the ATLAS detector. EUROPEAN PHYSICAL JOURNAL C, 78 (2). pp. 908-911.

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Measurements of longitudinal flow correlations are presented for charged particles in the pseudorapidity range | η | < 2.4 using 7 and 470 μ b - 1 of Pb+Pb collisions at s NN = 2.76 and 5.02 TeV, respectively, recorded by the ATLAS detector at the LHC. It is found that the correlation between the harmonic flow coefficients v n measured in two separated η intervals does not factorise into the product of single-particle coefficients, and this breaking of factorisation, or flow decorrelation, increases linearly with the η separation between the intervals. The flow decorrelation is stronger at 2.76 TeV than at 5.02 TeV. Higher-order moments of the correlations are also measured, and the corresponding linear coefficients for the k th -moment of the v n are found to be proportional to <i>k</i> for v 3 , but not for v 2 . The decorrelation effect is separated into contributions from the magnitude of v n and the event-plane orientation, each as a function of η . These two contributions are found to be comparable. The longitudinal flow correlations are also measured between v n of different order in <i>n</i>. The decorrelations of v 2 and v 3 are found to be independent of each other, while the decorrelations of v 4 and v 5 are found to be driven by the nonlinear contribution from v 2 2 and v 2 v 3 , respectively.

Item Type: Article
Additional Information: 27 pages plus author list + cover pages (44 pages total), 22 figures, 5 tables, submitted to Eur. Phys. J. C., All figures including auxiliary figures can be found at
Uncontrolled Keywords: ATLAS, flow decorrelation, longitudinal dynamics
Depositing User: Symplectic Admin
Date Deposited: 10 Apr 2018 07:53
Last Modified: 25 Jan 2024 09:06
DOI: 10.1140/epjc/s10052-018-5605-7
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