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(2 S) 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=68.5GeV . The data sample corresponds to an integrated luminosity of 21.7 ± 1.4 nb - 1 . The J/ψ and ψ(2 S) 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±46nb/nucleon . The ratio of J/ψ and D cross-sections is evaluated to (1.06 ± 0.02 ± 0.09) % . The ψ(2 S) 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

Calabrese R.;Capriotti L.;Cavallini V.;Couturier B.;Fiorini M.;Franzoso E.;Guarise M.;Kotriakhova S.;Luppi E.;Okamura S.;Pappalardo L. L.;Passalacqua B.;Tomassetti L.;
2023

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(2 S) 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=68.5GeV . The data sample corresponds to an integrated luminosity of 21.7 ± 1.4 nb - 1 . The J/ψ and ψ(2 S) 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±46nb/nucleon . The ratio of J/ψ and D cross-sections is evaluated to (1.06 ± 0.02 ± 0.09) % . The ψ(2 S) 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.
2023
Aaij, R.; Abdelmotteleb, A. S. W.; Beteta, C. A.; Abudinen, F.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Afsharnia, H.; Agapopoulou, C.; Aidala, C. A.;...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2534551
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