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.
2024
Settore FIS/01 - Fisica Sperimentale
Settore PHYS-01/A - Fisica sperimentale delle interazioni fondamentali e applicazioni
Hadron-Hadron Scattering; Particle and Resonance Production; Quarkonium; Relativistic Heavy Ion Physics
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11384/154103
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