• Open Access

Longitudinal Flow Decorrelations in Xe+Xe Collisions at sNN=5.44TeV with the ATLAS Detector

G. Aad et al. (ATLAS Collaboration)
Phys. Rev. Lett. 126, 122301 – Published 24 March 2021

Abstract

The first measurement of longitudinal decorrelations of harmonic flow amplitudes vn for n=24 in Xe+Xe collisions at sNN=5.44TeV is obtained using 3μb1 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=5.02TeV, 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.

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  • Received 14 January 2020
  • Revised 16 June 2020
  • Accepted 12 February 2021

DOI:https://doi.org/10.1103/PhysRevLett.126.122301

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

© 2021 CERN, for the ATLAS Collaboration

Physics Subject Headings (PhySH)

Nuclear Physics

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Vol. 126, Iss. 12 — 26 March 2021

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