Alfonso Albero, AlejandroCalvo Gómez, MíriamCamboni, AlessandroCoquereau, SamuelGarrido Beltrán, LluísGascón Fora, DavidGraciani Díaz, RicardoGraugés Pous, EugeniVilasis-Cardona, XavierLHCb Collaboration2020-10-132020-10-132019-04-020031-9007https://hdl.handle.net/2445/171183The first measurement of heavy-flavor production by the LHCb experiment in its fixed-target mode is presented. The production of J / ψ and D 0 mesons is studied with beams of protons of different energies colliding with gaseous targets of helium and argon with nucleon-nucleon center-of-mass energies of √ s NN = 86.6 and 110.4 GeV, respectively. The J / ψ and D 0 production cross sections in p He collisions in the rapidity range [2, 4.6] are found to be σ J / ψ = 652 ± 33 ( stat ) ± 42 ( syst )       nb / nucleon and σ D 0 = 80.8 ± 2.4 ( stat ) ± 6.3 ( syst )     μ b / nucleon , where the first uncertainty is statistical and the second is systematic. No evidence for a substantial intrinsic charm content of the nucleon is observed in the large Bjorken- x region.12 p.application/pdfeng(c) American Physical Society, 2019Cromodinàmica quànticaQuarksCol·lisions d'ions pesatsQuantum chromodynamicsQuarksHeavy ion collisioninfo:eu-repo/semantics/article6945122020-10-13info:eu-repo/semantics/openAccess