Prompt and non-prompt J/ψ J/ψ and ψ(2S) ψ(2S) suppression at high transverse momentum in 5.02 TeV 5.02 TeV Pb+Pb collisions with the ATLAS experiment

Abraham, N L, Allbrooke, B M M, Asquith, L, Cerri, A, Jones, S D, De Santo, A, Salvatore, F, Shaw, K, Stevenson, T J, Suruliz, K, Sutton, M R, Tresoldi, F, Trovato, F, Vivarelli, I, Winkels, E, The ATLAS Collaboration, and others, (2018) Prompt and non-prompt J/ψ J/ψ and ψ(2S) ψ(2S) suppression at high transverse momentum in 5.02 TeV 5.02 TeV Pb+Pb collisions with the ATLAS experiment. European Physical Journal C - Particles and Fields, 78 (762). pp. 1-28. ISSN 1434-6044

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Abstract

A measurement of J/ψ J/ψ and ψ(2S) ψ(2S) production is presented. It is based on a data sample from Pb+Pb collisions at √sNN =5.02 TeV sNN=5.02 TeV and pp collisions at √s =5.02 TeV s=5.02 TeV recorded by the ATLAS detector at the LHC in 2015, corresponding to an integrated luminosity of 0.42 nb −1 0.42 nb−1 and 25 pb −1 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 μμ T <40 9<pTμμ<40 GeV in dimuon transverse momentum, and −2<y μμ <2 −2<yμμ<2 in rapidity. Strong suppression is found in Pb+Pb collisions for both prompt and non-prompt J/ψ J/ψ, increasing with event centrality. The suppression of prompt ψ(2S) ψ(2S) is observed to be stronger than that of J/ψ J/ψ, while the suppression of non-prompt ψ(2S) ψ(2S) is equal to that of the non-prompt J/ψ 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 J/ψ arising from different mechanisms, the dependence of their nuclear modification factors on centrality is found to be quite similar.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QC Physics
Depositing User: Amelia Redman
Date Deposited: 20 Sep 2019 13:15
Last Modified: 20 Sep 2019 13:30
URI: http://sro.sussex.ac.uk/id/eprint/85916

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