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

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[1] Central exclusive production of j/ψ and ψ(2s) mesons in pp collisions at s√=13 tev / А. В. Бережной, И. В. Горелов, А. К. Лефлат et al. // Journal of High Energy Physics. — 2018. — Vol. 2018, no. 10. Measurements are reported of the central exclusive production of and 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−σψ(2S)→μ+μ−==435±18±17±16 pb,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. [ DOI ]

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