Aaboud, M.Aad, G.Abbott, B.Abdallah, J.Abdinov, O.Abeloos, B.Abidi, S. H.Izen, Joseph M.Meirose, BernhardReeves, KendallATLAS Colaboration2018-11-052018-11-052018-02-282018-11-051434-6044http://hdl.handle.net/10735.1/6262The modification of the production of J/ψ, ψ(2S), and Υ(nS) (n = 1, 2, 3) in p+Pb collisions with respect to their production in pp collisions has been studied. The p+Pb and pp datasets used in this paper correspond to integrated luminosities of 28 nb⁻¹ and 25 pb⁻¹ respectively, collected in 2013 and 2015 by the ATLAS detector at the LHC, both at a centre-of-mass energy per nucleon pair of 5.02 TeV. The quarkonium states are reconstructed in the dimuon decay channel. The yields of J/ψ and ψ(2S) are separated into prompt and non- prompt sources. The measured quarkonium differential cross sections are presented as a function of rapidity and transverse momentum, as is the nuclear modification factor, R_{pPb} for J/ψ and Υ(nS). No significant modification of the J/ψ production is observed while Υ(nS) production is found to be suppressed at low transverse momentum in p+Pb collisions relative to pp collisions. The production of excited charmonium and bottomonium states is found to be suppressed relative to that of the ground states in central p+Pb collisions.enCC BY 4.0 (Attribution)©2017 CERN, for the ATLAS Collaborationhttp://creativecommons.org/licenses/by/4.0/J/ψ (J/psi) mesonCharmoniumAbsorptionLarge Hadron Collider (France and Switzerland)Proton-lead interactionsProton-proton interactionsQuarkoniumsTransverse momentumarticleAaboud, M., G. Aad, B. Abbott, J. Abdallah, et al. 2018. "Measurement of quarkonium production in proton-lead and proton- proton collisions at 5.02 TeV with the ATLAS detector." European Physical Journal C 78(3), doi:10.1140/epjc/s10052-018-5624-4783