Central exclusive production of J/ψ and ψ(2S) mesons in pp collisions at √s = 13 TeV
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Author(s)
Aaij, R.
Adeva, B.
Adinolfi, M.
Aidala, C. A
Ajaltouni, Z.
Akar, S.
Albicocco, P.
Albrecht, J.
Alessio, F.
Alexander, M.
Date Issued
October 2018
Journal
Journal of High Energy Physics
Publisher
Springer Berlin Heidelberg
Citation
The LHCb collaboration, et al. “Central Exclusive Production of J/ψ and ψ(2S) Mesons in Pp Collisions at √S=13 TeV.” Journal of High Energy Physics, vol. 2018, no. 10, Oct. 2018. © 2018 The Authors
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Final published version
Abstract
Measurements are reported of the central exclusive production of J/ψ and ψ(2S) mesons in pp collisions at a centre-of-mass energy of 13 TeV. Backgrounds are significantly reduced compared to previous measurements made at lower energies through the use of new forward shower counters. The products of the cross-sections and the branching fractions for the decays to dimuons, where both muons are within the pseudorapidity range 2.0 < η < 4.5, are measured to be σ[subscript J/ψ → μ[superscript +]μ[superscript −] = 435 ± 18 ± 11 ± 17 pb
σ[subscript ψ(2S) → μ[superscript +]μ[superscript −] = 11.1 ± 1.1 ± 0.3 ± 0.4 pb.
The first uncertainties are statistical, the second are systematic, and the third are due to the luminosity determination. The cross-sections are also measured differentially for meson rapidities between 2.0 and 4.5. Good agreement is observed with theoretical predictions. Photoproduction cross-sections are derived and compared to previous experiments, and a deviation from a pure power-law extrapolation of lower energy data is observed.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1007/JHEP10(2018)167
