Charmonium production in pNe collisions at \sqrts NN =68.5 GeVстатья
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Дата последнего поиска статьи во внешних источниках: 17 апреля 2024 г.
Аннотация: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-of-mass rapidity range y∗∈[−2.29,0] is found to be 506±8±25 nb/nucleon. 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.