Longitudinal flow decorrelations in Xe + Xe collisions at √sNN = 5.44 TeV with the ATLAS detector

ATLAS Collaboration

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29 Citations (Scopus)
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Abstract

The first measurement of longitudinal decorrelations of harmonic flow amplitudes vn for n = 2-4 in Xe+Xe collisions at √sNN = 5.44 TeV is obtained using 3 μb-1 of data with the ATLAS detector at the LHC. The decorrelation signal for v3 and v4 is found to be nearly independent of collision centrality and transverse momentum (pT) requirements on final-state particles, but for v2 a strong centrality and pT dependence is seen. When compared with the results from Pb + Pb collisions at √sNN = 5.02 TeV, the longitudinal decorrelation signal in midcentral Xe + Xe collisions is found to be larger for v2, but smaller for v3. Current hydrodynamic models reproduce the ratios of the vn measured in Xe + Xe collisions to those in Pb+Pb collisions but fail to describe the magnitudes and trends of the ratios of longitudinal flow decorrelations between Xe + Xe and Pb + Pb. The results on the system-size dependence provide new insights and an important lever arm to separate effects of the longitudinal structure of the initial state from other early and late time effects in heavy-ion collisions.

Original languageEnglish
Article number122301
Pages (from-to)122301-1-122301-20
Number of pages20
JournalPhysical Review Letters
Volume126
Issue number12
DOIs
Publication statusPublished - 26 Mar 2021
Externally publishedYes

Bibliographical note

Copyright the Author(s) 2021. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

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