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 2.5TeV protons colliding on gaseous neon targets at rest, corresponding to a nucleon-nucleon centre-of-mass energy sNN−−−√=68.5GeV . 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-of-mass 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

Audurier, B.;Belin, S.;Brundu, D.;Bursche, A.;Cardini, A.;Chen, S.;Dettori, F.;Dordei, F.;Litvinov, R.;Manca, G.;Muzzetto, P.;Oldeman, R.;Saitta, B.;Sun, J.;
2023-01-01

Abstract

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 2.5TeV protons colliding on gaseous neon targets at rest, corresponding to a nucleon-nucleon centre-of-mass energy sNN−−−√=68.5GeV . 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-of-mass 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.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11584/370323
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