Prompt and non-prompt $$J/\psi $$ and $$\psi (2\mathrm {S})$$ suppression at high transverse momentum in $$5.02~\mathrm {TeV}$$ Pb+Pb collisions with the ATLAS experiment
CERN for the benefit of the ATLAS collaboration. A measurement of $$J/\psi $$ and $$\psi (2\mathrm {S})$$ production is presented. It is based on a data sample from Pb+Pb collisions at =5.02 TeV and pp collisions at $$ \sqrt{s}$$=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 < p$$\mathbb μμ\atop{T}$$ < 40 GeV in dimuon transverse momentum, and -2 < yμμ < 2 in rapidity. Strong suppression is found in Pb+Pb collisions for both prompt and non-prompt $$J/\psi $$, increasing with event centrality. The suppression of prompt $$\psi (2\mathrm {S})$$ is observed to be stronger than that of $$J/\psi $$, while the suppression of non-prompt $$\psi (2\mathrm {S})$$ is equal to that of the non-prompt $$J/\psi $$ within uncertainties, consistent with the expectation that both arise from b-quarks propagating through the medium. Despite prompt and non-prompt $$J/\psi $$ arising from different mechanisms, the dependence of their nuclear modification factors on centrality is found to be quite similar.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- Contributing Organization:
- ATLAS Collaboration
- Grant/Contract Number:
- AC02-05CH11231
- OSTI ID:
- 1506356
- Alternate ID(s):
- OSTI ID: 1735580; OSTI ID: 22747204; OSTI ID: 1499480
- Journal Information:
- European Physical Journal. C, Particles and Fields, Journal Name: European Physical Journal. C, Particles and Fields Journal Issue: 9 Vol. 78; ISSN 1434-6044
- Publisher:
- SpringerCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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