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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/221847
Multiplicity dependence of σψ(2S)/σJ/ψ in pp collisions at √s = 13 TeV
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The ratio of production cross-sections of ψ(2S) over J/ψ mesons as a function of charged-particle multiplicity in proton-proton collisions at a centre-of-mass energy √ s = 13 TeV is measured with a data sample collected by the LHCb detector, corresponding to an integrated luminosity of 658 pb−1 . The ratio is measured for both prompt and non-prompt ψ(2S) and J/ψ mesons. When there is an overlap between the rapidity ranges over which multiplicity and charmonia production are measured, a multiplicity-dependent modifcation of the ratio is observed for prompt mesons. No signifcant multiplicity dependence is found when the ranges do not overlap. For non-prompt production, the ψ(2S)-to-J/ψ production ratio is roughly independent of multiplicity, irrespective of the rapidity range over which the multiplicity is measured. The results are compared to predictions of the co-mover model and agree well except in the low multiplicity region. The ratio of production cross-sections of ψ(2S) over J/ψ mesons are cross-checked with other measurements in di-lepton channels and found to be compatible.
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COMERMA MONTELLS, Albert, et al. Multiplicity dependence of σψ(2S)/σJ/ψ in pp collisions at √s = 13 TeV . Journal of High Energy Physics. 2024. Vol. 2024, num. 243. ISSN 1126-6708. [consulted: 13 of August of 2026]. Available at: https://hdl.handle.net/2445/221847