Abstract
The measurement of charmonium states produced in proton-neon (ptext {Ne}) collisions by the LHCb experiment in its fixed-target configuration is presented. The production of {{J} hspace{-1.66656pt}/hspace{-1.111pt}psi } and psi {(2S)} mesons is studied with a beam of 2.5mathrm{,Tehspace{-1.00006pt}V} protons colliding on gaseous neon targets at rest, corresponding to a nucleon-nucleon centre-of-mass energy sqrt{s_{scriptscriptstyle text {NN}}} =68.5mathrm{,Gehspace{-1.00006pt}V} . The data sample corresponds to an integrated luminosity of 21.7pm 1.4 nb^{-1}. The {{J} hspace{-1.66656pt}/hspace{-1.111pt}psi } and psi {(2S)} hadrons are reconstructed in mu ^+mu ^- final states. The {{J} hspace{-1.66656pt}/hspace{-1.111pt}psi } production cross-section per target nucleon in the centre-of-mass rapidity range y^star in [-2.29, 0] is found to be 506 pm 8 pm 46 text { nb/nucleon}. The ratio of {{J} hspace{-1.66656pt}/hspace{-1.111pt}psi } and D^0 cross-sections is evaluated to (1.06 pm 0.02 pm 0.09)%. The psi {(2S)} to {{J} hspace{-1.66656pt}/hspace{-1.111pt}psi } relative production rate is found to be (1.67 pm 0.27pm 0.10)% in good agreement with other measurements involving beam and target nuclei of similar sizes.
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