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Mixed higher-order anisotropic flow and nonlinear response coefficients of charged particles in PbPb collisions at \sqrt{S_{NN}} = 2.76 and 5.02 TeV

Sirunyan, AM; Tumasyan, A; Adam, W; Ambrogi, F; Bergauer, T; Brandstetter, J; Dragicevic, M; ... CMS Collaboration, .; + view all (2020) Mixed higher-order anisotropic flow and nonlinear response coefficients of charged particles in PbPb collisions at \sqrt{S_{NN}} = 2.76 and 5.02 TeV. The European Physical Journal C , 80 (6) , Article 534. 10.1140/epjc/s10052-020-7834-9. Green open access

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Abstract

Anisotropies in the initial energy density distribution of the quark-gluon plasma created in high energy heavy ion collisions lead to anisotropies in the azimuthal distributions of the final-state particles known as collective anisotropic flow. Fourier harmonic decomposition is used to quantify these anisotropies. The higher-order harmonics can be induced by the same order anisotropies (linear response) or by the combined influence of several lower order anisotropies (nonlinear response) in the initial state. The mixed higher-order anisotropic flow and nonlinear response coefficients of charged particles are measured as functions of transverse momentum and centrality in PbPb collisions at nucleon-nucleon center-of-mass energies \sqrt{S_{NN}} = 2.76 and 5.02 TeV with the CMS detector. The results are compared with viscous hydrodynamic calculations using several different initial conditions, as well as microscopic transport model calculations. None of the models provides a simultaneous description of the mixed higher-order flow harmonics and nonlinear response coefficients.

Type: Article
Title: Mixed higher-order anisotropic flow and nonlinear response coefficients of charged particles in PbPb collisions at \sqrt{S_{NN}} = 2.76 and 5.02 TeV
Location: France
Open access status: An open access version is available from UCL Discovery
DOI: 10.1140/epjc/s10052-020-7834-9
Publisher version: https://doi.org/10.1140/epjc/s10052-020-7834-9
Language: English
Additional information: © 2020 Springer Nature Switzerland AG. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/).
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
URI: https://discovery-pp.ucl.ac.uk/id/eprint/10105455
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