The European Physical Journal C > 2018 > 78 > 3 > 1-32
Measurement of quarkonium production in proton–lead and proton–proton collisions at $$5.02~\mathrm {TeV}$$ 5.02TeV with the ATLAS detector
Source
Abstract
The modification of the production of $$J/\psi $$ J/ψ , $$\psi (2\mathrm {S})$$ ψ(2S) , and $$\varUpsilon (n\mathrm {S})$$ Υ(nS) ($$n = 1, 2, 3$$ 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 $$28~\mathrm {nb}^{-1}$$ 28nb-1 and $$25~\mathrm {pb}^{-1}$$ 25pb-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 $$J/\psi $$ J/ψ and $$\psi (\mathrm {2S})$$ 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, $$R_{p\mathrm {Pb}}$$ RpPb for $$J/\psi $$ J/ψ and $$\varUpsilon (n\mathrm {S})$$ Υ(nS) . No significant modification of the $$J/\psi $$ J/ψ production is observed while $$\varUpsilon (n\mathrm {S})$$ 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.
Identifiers
journal ISSN : | 1434-6044 |
journal e-ISSN : | 1434-6052 |
DOI | 10.1140/epjc/s10052-018-5624-4 |