Abstract
Abstract:
A measurement of J/ψ and ψ(2S) production is presented. It is based on a data sample from Pb+Pb
collisions at √sNN = 5.02 TeV and pp collisions at √s = 5.02 TeV recorded by the
ATLAS detector at the LHC in 2015, corresponding to an integrated luminosity of 0.42 nb−1 and 25
pb−1 in Pb+Pb and pp, respectively. The measurements of per-event yields, nuclear modification
factors, and non-prompt fractions are performed in the dimuon decay channel for 9 < pµµ < 40 GeV in
dimuon transverse momentum, and −2.0 < yµµ < 2.0 in rapidity. Strong suppression is found in Pb+Pb
collisions for both prompt and non-prompt J/ψ, as well as for prompt and non-prompt ψ(2S),
increasing with event centrality. The suppression of prompt ψ(2S) is observed to be stronger than
that of J/ψ, while the suppression of non- prompt ψ(2S) is equal to that of the non-prompt J/ψ
within uncertainties, consistent with the expectation that both arise from b-quarks propagating
through the medium. Despite prompt and non-prompt J/ψ arising from different mechanisms, the
dependence of their nuclear
modification factors on centrality is found to be quite similar.