2026-04-17T12:03:13Zhttps://recercat.cat/oai/request

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

00925njm 22002777a 4500 dc Alfonso Albero, Alejandro author Garcia Moreno, Paula author Garrido Beltrán, Lluís author Gironella Gironell, Pere author Gomez Fernandez, S. author Graugés Pous, Eugeni author Lobo Salvia, Aniol author Marin Benito, Carla author Mauricio, J. author Vazquez Gomez, Ricardo author LHCb collaboration author 2025-04-25T13:49:23Z 2025-04-25T13:49:23Z 2023 2025-04-25T13:49:23Z 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 Charmonium production in pNe collisions at √sNN = 68.5 GeV