2026-04-17T03:11:53Zhttps://recercat.cat/oai/requestoai:recercat.cat:2445/2218472025-12-05T16:56:45Zcom_2072_1057col_2072_478823col_2072_478917
RECERCAT
author
Comerma Montells, Albert
author
Garcia Moreno, Paula
author
Garrido Beltrán, Lluís
author
Gioventù, Alessandra
author
Gironella Gironell, Pere
author
Gomez Fernandez, Sergio
author
Graugés Pous, Eugeni
author
Lobo Salvia, Aniol
author
López Huertas, Albert
author
Manera Escalero, Rafel
author
Marin Benito, Carla
author
Mauricio Ferre, Joan
author
Alfonso Albero, Alejandro
author
Vazquez Gomez, Ricardo
author
LHCb Collaboration
2025-06-27T13:39:40Z2025-06-27T13:39:40Z20242025-06-27T13:39:40Z
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.
cc-by (c) Aaij, R. et al., 2024 http://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess
Col·lisions d'ions pesats
Hadrons
Física de partícules
Heavy ion collision
Hadrons
Particle physics
Multiplicity dependence of σψ(2S)/σJ/ψ in pp collisions at √s = 13 TeV
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion