The ratio of production cross-sections of Psi(2S) over J/Psi 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 Psi(2S) and J/Psi mesons. When there is an overlap between the rapidity ranges over which multiplicity and charmonia production are measured, a multiplicity-dependent modification of the ratio is observed for prompt mesons. No significant multiplicity dependence is found when the ranges do not overlap. For non-prompt production, the Psi(2S)-to-J/Psi 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 Psi(2S) over J/Psi mesons are cross-checked with other measurements in di-lepton channels and found to be compatible.
Multiplicity dependence of sigma_Psi(2S)/sigma_J/Psi in pp collisions at sqrt{s} = 13 TeV
Bassi G.Membro del Collaboration Group
;Kleijne N.Membro del Collaboration Group
;Morello M. J.Membro del Collaboration Group
;Pica L.Membro del Collaboration Group
;Ribatti R.Membro del Collaboration Group
;
2024
Abstract
The ratio of production cross-sections of Psi(2S) over J/Psi 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 Psi(2S) and J/Psi mesons. When there is an overlap between the rapidity ranges over which multiplicity and charmonia production are measured, a multiplicity-dependent modification of the ratio is observed for prompt mesons. No significant multiplicity dependence is found when the ranges do not overlap. For non-prompt production, the Psi(2S)-to-J/Psi 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 Psi(2S) over J/Psi mesons are cross-checked with other measurements in di-lepton channels and found to be compatible.| File | Dimensione | Formato | |
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JHEP05(2024)243.pdf
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