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      Longitudinal flow decorrelations in Xe+Xe collisions at \(\sqrt{s_{\mathrm{NN}}}=5.44\) TeV with the ATLAS detector

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          Abstract

          The first measurement of longitudinal decorrelations of harmonic flow amplitudes \(v_n\) for \(n=2\), 3 and 4 in Xe+Xe collisions at \(\sqrt{s_{\mathrm{NN}}}=5.44\) TeV is obtained using 3~\({\mu}\textrm{b}^{-1}\) of data with the ATLAS detector at the LHC. The decorrelation signal for \(v_3\) and \(v_4\) is found to be nearly independent of collision centrality and transverse momentum (\(p_{\mathrm{T}}\)) requirements on final-state particles, but for \(v_2\) a strong centrality and \(p_{\mathrm{T}}\) dependence is seen. When compared with the results from Pb+Pb collisions at \(\sqrt{s_{\mathrm{NN}}}=5.02\) TeV, the longitudinal decorrelation signal in mid-central Xe+Xe collisions is found to be larger for \(v_2\), but smaller for \(v_3\). Current hydrodynamic models reproduce the ratios of the \(v_n\) 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. These results provide new insights into the longitudinal structure of the initial-state geometry in heavy-ion collisions.

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          Author and article information

          Journal
          13 January 2020
          Article
          2001.04201
          ae18e04e-65fd-4e95-b8e1-de6ce14953fb

          http://creativecommons.org/licenses/by/4.0/

          History
          Custom metadata
          CERN-EP-2019-275
          29 pages in total, author list starting page 13, 4 figures, submitted to Phys. Rev. Lett. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2019-06/
          nucl-ex hep-ex

          High energy & Particle physics,Nuclear physics
          High energy & Particle physics, Nuclear physics

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