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

Research output: Contribution to journalArticlepeer-review

  • External authors:
  • Agni Bethani
  • Brian Cox
  • Cinzia Da Via
  • Nicholas Dann
  • Alessandra Forti
  • David Lack
  • Jiri Masik
  • Stephen Menary
  • Emily Orgill
  • Joleen Pater
  • Darren Price
  • Yang Qin
  • Jacob Rawling
  • Rhys Roberts
  • Savanna Shaw
  • Stephen Watts
  • Terence Wyatt
  • The ATLAS Collaboration


The elliptic flow of prompt and non-prompt J/ψ was measured in the dimuon decay channel in Pb+Pb collisions at sNN−−−√=5.02 TeV with an integrated luminosity of 0.42 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/ψ decay. The measurement is performed in the kinematic range of dimuon transverse momentum and rapidity 9<pT<30 GeV , |y|<2 , and 0–60% collision centrality. The elliptic flow coefficient, v2 , 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/ψ mesons have non-zero elliptic flow. Prompt J/ψ v2 decreases as a function of pT , while for non-prompt J/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.

Bibliographical metadata

Original languageEnglish
Article number081801
JournalEuropean Physical Journal C. Particles and Fields
Issue number784
Early online date27 Sep 2018
Publication statusPublished - Sep 2018