Study of exclusive photoproduction of charmonium in ultra-peripheral lead-lead collisions

Abstract

The cross-sections of exclusive (coherent) photoproduction $J/\psi$ and $\psi (2S)$ mesons in ultra-peripheral PbPb collisions at a nucleon-nucleon centre-of-mass energy of $5.02\mathrm{TeV}$ are measured using a data sample corresponding to an integrated luminosity of $228\pm 10{\mu \mathrm{b}}^{-1}$, 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 $J/\psi$ and $\psi (2S)$ mesons. The integrated cross-sections are measured to be \mbox{${\sigma }_{J/\psi }^{\mathrm{coh}}=5.965\pm 0.059\pm 0.232\pm 0.262\mathrm{mb}$} and \mbox{${\sigma }_{\psi (2S)}^{\mathrm{coh}}=0.923\pm 0.086\pm 0.028\pm 0.040\mathrm{mb}$}, 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 \mbox{${\sigma }_{\psi (2S)}^{\mathrm{coh}}/{\sigma }_{J/\psi }^{\mathrm{coh}}=0.155\pm 0.014\pm 0.003$}, where the first uncertainty is statistical and the second is systematic. These results are compatible with theoretical predictions.

arXiv commentAll figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2022-012.html (LHCb public pages)

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• Exploring Baryon Resonances with Transition Generalized Parton Distributions: Status and Perspectives
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