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684625.pdf (689.78 KB)

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2018

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cc-by (c) The LHCb collaboration (Alfonso Albero, A. et al., 2018
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/185381

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

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Recurs relacionat

https://doi.org/10.1007/JHEP10(2018)167

Resum

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 ± 17 pb σψ(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.

Matèries

Hadrons, Gran Col·lisionador d'Hadrons, Física de partícules, Experiments

Matèries (anglès)

Hadrons, Large Hadron Collider (France and Switzerland), Particle physics, Experiments

Citació

Col·leccions

Articles publicats en revistes (Física Quàntica i Astrofísica)

Citació

ALFONSO ALBERO, Alejandro, et al. Central exclusive production of J/ψ and ψ(2S) mesons in pp collisions at √s=13 TeV. Journal of High Energy Physics. 2018. Vol. 2021, num. 8, pags. 1-28. ISSN 1126-6708. [consulted: 17 of August of 2026]. Available at: https://hdl.handle.net/2445/185381

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