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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/220635
Study of exclusive photoproduction of charmonium inultra-peripheral lead-lead collisions
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The cross-sections of exclusive (coherent) photoproduction J/ψ and ψ(2S) mesons in ultra-peripheral PbPb collisions at a nucleon-nucleon centre-of-mass energy of 5.02 TeV are measured using a data sample corresponding to an integrated luminosity of 228 ± 10 µb −1 , collected by the LHCb experiment in 2018. The differential cross-sections are measured separately as a function of transverse momentum and rapidity in the nucleus-nucleus centre-of-mass frame for J/ψ and ψ(2S) mesons. The integrated cross-sections are measured to be σ coh J/ψ = 5.965 ± 0.059 ± 0.232 ± 0.262 mb and σ coh ψ(2S) = 0.923 ± 0.086 ± 0.028 ± 0.040 mb, where the first listed uncertainty is statistical, the second systematic and the third due to the luminosity determination. The cross-section ratio is measured to be σ coh ψ(2S)/σcoh J/ψ = 0.155 ± 0.014 ± 0.003, where the first uncertainty is statistical and the second is systematic. These results are compatible with theoretical predictions.
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AAIJ, R., ALFONSO ALBERO, Alejandro, GARCIA MORENO, Paula, GARRIDO BELTRÁN, Lluís, GIRONELLA GIRONELL, Pere, GOMEZ FERNANDEZ, S., GRAUGÉS POUS, Eugeni, LOBO SALVIA, Aniol, MARIN BENITO, Carla, MAURICIO, J., VAZQUEZ GOMEZ, Ricardo, LHCb collaboration. Study of exclusive photoproduction of charmonium inultra-peripheral lead-lead collisions. _Journal of High Energy Physics_. 2023. Vol. 2023, núm. 146, pàgs. 1-25. [consulta: 26 de febrer de 2026]. ISSN: 1126-6708. [Disponible a: https://hdl.handle.net/2445/220635]