Central exclusive production of J/ψ and ψ(2S) mesons in pp collisions at √s=13 TeV

The LHCb Collaboration

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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 σJ/ψ→μ+μ−=435±18±11±17pbσψ(2S)→μ+μ−=11.1±1.1±0.3±0.4pb. 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.[Figure not available: see fulltext.]

Original languageEnglish
Article number167
JournalJournal of High Energy Physics
Volume2018
Issue number10
DOIs
Publication statusPublished - 1 Oct 2018

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Keywords

  • Charm physics
  • Forward physics
  • Hadron-Hadron scattering (experiments)
  • Particle and resonance production
  • Quarkonium

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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