Prompt and non-prompt J/ψJ/ψ elliptic flow in Pb+Pb collisions at sNN−−−√=5.02sNN=5.02 Tev with the ATLAS detector

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Authors

Colleges, School and Institutes

Abstract

The elliptic flow of prompt and non-prompt J/ψJ/ψ was measured in the dimuon decay channel in Pb+Pb collisions at sNN−−−√=5.02sNN=5.02 TeVTeV with an integrated luminosity of 0.42 nb−10.42 nb−1 with the ATLAS detector at the LHC. The prompt and non-prompt signals are separated using a two-dimensional simultaneous fit of the invariant mass and pseudo-proper decay time of the dimuon system from the J/ψJ/ψ decay. The measurement is performed in the kinematic range of dimuon transverse momentum and rapidity 9<pT<309<pT<30 GeVGeV, |y|<2|y|<2, and 0–60% collision centrality. The elliptic flow coefficient, v2v2, is evaluated relative to the event plane and the results are presented as a function of transverse momentum, rapidity and centrality. It is found that prompt and non-prompt J/ψJ/ψ mesons have non-zero elliptic flow. Prompt J/ψJ/ψ v2v2decreases as a function of pTpT, while for non-prompt J/ψJ/ψ it is, with limited statistical significance, consistent with a flat behaviour over the studied kinematic region. There is no observed dependence on rapidity or centrality.

Bibliographic note

34 pages in total, author list starting page 18, 7 figures, 2 tables, Eur. Phys. J. C 78 (2018) 784. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2017-05

Details

Original languageEnglish
Article number784
JournalEuropean Physical Journal C
Volume78
Publication statusPublished - 27 Sep 2018

Keywords

  • nucl-ex, hep-ex