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Title: Central exclusive production of J/ψ and ψ(2S) mesons in pp collisions at √ s =13 TeV
Authors: Aaij, Roel
Adeva, Bernardo
Adinolfi, Marco
Panshin, Gennady Leonidovich
Strokov, Sergey Aleksandrovich
Vagner, Aleksandr Rudolfovich
Keywords: физика; адронное взаимодействие; рассеяние
Issue Date: 2018
Publisher: Томский политехнический университет
Citation: Central exclusive production of J/ψ and ψ(2S) mesons in pp collisions at √ s =13 TeV / R. Aaij [et al.] // Journal of High Energy Physics. — 2018. — № 10. — [167, 26 p.].
Abstract: Measurements are reported of the central exclusive production of J/ψ and ψ(2S) mesons in ppcollisions 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 beσJ/ψ→μ+μ−=435±18±11±17 pbσψ(2S)→μ+μ−=11.1±1.1±0.3±0.4 pb.σJ/ψ→μ+μ−=435±18±11±17 pbσψ(2S)→μ+μ−=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.
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