2026-04-14T03:50:27Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/2206292025-12-05T16:10:23Zcom_2072_1057col_2072_478823col_2072_478904col_2072_478917

Charmonium production in pNe collisions at √sNN = 68.5 GeV Alfonso Albero, Alejandro Garcia Moreno, Paula Garrido Beltrán, Lluís Gironella Gironell, Pere Gomez Fernandez, S. Graugés Pous, Eugeni Lobo Salvia, Aniol Marin Benito, Carla Mauricio, J. Vazquez Gomez, Ricardo LHCb collaboration The measurement of charmonium states produced in proton-neon (pNe) collisions by the LHCb experiment in its fixed-target configuration is presented. The production of J/ψ and ψ(2S) mesons is studied with a beam of 2.5 TeV protons colliding on gaseous neon targets at rest, corresponding to a nucleon-nucleon centre-of-mass energy √sNN = 68.5 GeV. The data sample corresponds to an integrated luminosity of 21.7 ± 1.4 nb−1. The J/ψ and ψ(2S) hadrons are reconstructed in μ+μ− final states. The J/ψ production cross-section per target nucleon in the centre-ofmass rapidity range y ∈ [−2.29, 0] is found to be 506 ± 8 ± 46 nb/nucleon. The ratio of J/ψ and D0 cross-sections is evaluated to (1.06 ± 0.02 ± 0.09)%. The ψ(2S) to J/ψ relative production rate is found to be (1.67±0.27±0.10)% in good agreement with other measurements involving beam and target nuclei of similar sizes 2025-04-25T13:49:23Z 2025-04-25T13:49:23Z 2023 2025-04-25T13:49:23Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Reproducció del document publicat a: https://doi.org/10.1140/epjc/s10052-023-11608-6 European Physical Journal C, 2023, vol. 83, num.625, p. 1-11 https://doi.org/10.1140/epjc/s10052-023-11608-6 cc-by (c) LHCb collaboration, 2023 http://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess Società Italiana di Fisica & Springer Verlag Articles publicats en revistes (Física Quàntica i Astrofísica)