Measurement of exclusive $J/\psi$ and $\psi(2S)$ production at $\sqrt{s}=13$ TeV


Collaboration, LHCb, Aaij, Roel ORCID: 0000-0003-0533-1952, Abdelmotteleb, Ahmed Sameh Wagih ORCID: 0000-0001-7905-0542, Abellan Beteta, Carlos, Abudinèn, Fernando Jesus ORCID: 0000-0002-6737-3528, Ackernley, Thomas ORCID: 0000-0002-5951-3498, Adefisoye, Ayomide Matthew ORCID: 0000-0003-2448-1550, Adeva, Bernardo ORCID: 0000-0001-9756-3712, Adinolfi, Marco ORCID: 0000-0002-1326-1264, Adlarson, Patrik Harri ORCID: 0000-0001-6280-3851 et al (show 1087 more authors) (2025) Measurement of exclusive $J/\psi$ and $\psi(2S)$ production at $\sqrt{s}=13$ TeV SciPost Physics, 18 (2). 071-. ISSN 2542-4653, 2542-4653

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Abstract

Measurements are presented of the cross-section for the central exclusive production of J/\psi\to\mu^+\mu^- J / ψ → μ + μ − and \psi(2S)\to\mu^+\mu^- ψ ( 2 S ) → μ + μ − processes in proton-proton collisions at \sqrt{s} = 13 \ \mathrm{TeV} s = 13 T e V with 2016–2018 data. They are performed by requiring both muons to be in the LHCb acceptance (with pseudorapidity 2<\eta_{\mu^±} < 4.5 2 < η μ ± < 4.5 ) and mesons in the rapidity range 2.0 < y < 4.5 2.0 < y < 4.5 . The integrated cross-section results are \sigma_{J/\psi\to\mu^+\mu^-}(2.0<y_{J/\psi}<4.5,2.0<\eta_{\mu^{±}} < 4.5) = 400 ± 2 ± 5 ± 12 \mathrm{pb}, \ \sigma_{\psi(2S)\to\mu^+\mu^-}(2.0<y_{\psi(2S)}<4.5,2.0<\eta_{\mu^{±}} < 4.5) = 9.40 ± 0.15 ± 0.13 ± 0.27 \mathrm{pb}, σ J / ψ → μ + μ − ( 2.0 < y J / ψ < 4.5 , 2.0 < η μ ± < 4.5 ) = 400 ± 2 ± 5 ± 12 p b , σ ψ ( 2 S ) → μ + μ − ( 2.0 < y ψ ( 2 S ) < 4.5 , 2.0 < η μ ± < 4.5 ) = 9.40 ± 0.15 ± 0.13 ± 0.27 p b , where the uncertainties are statistical, systematic and due to the luminosity determination. In addition, a measurement of the ratio of \psi(2S) ψ ( 2 S ) and J/\psi J / ψ cross-sections, at an average photon-proton centre-of-mass energy of 1\ \mathrm{TeV} 1 T e V , is performed, giving$ = 0.1763 ± 0.0029 ± 0.0008 ± 0.0039,$ where the first uncertainty is statistical, the second systematic and the third due to the knowledge of the involved branching fractions. For the first time, the dependence of the J/\psi J / ψ and \psi(2S) ψ ( 2 S ) cross-sections on the total transverse momentum transfer is determined in pp p p collisions and is found consistent with the behaviour observed in electron-proton collisions.

Item Type: Article
Uncontrolled Keywords: 4902 Mathematical Physics, 49 Mathematical Sciences, 51 Physical Sciences
Divisions: Faculty of Humanities & Social Sciences
Faculty of Science & Engineering
Faculty of Science & Engineering > School of Engineering
Faculty of Science & Engineering > School of Physical Sciences
Faculty of Humanities & Social Sciences > School of the Arts
Depositing User: Symplectic Admin
Date Deposited: 25 Mar 2025 10:33
Last Modified: 24 Nov 2025 08:43
DOI: 10.21468/scipostphys.18.2.071
Open Access URL: https://scipost.org/10.21468/SciPostPhys.18.2.071
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3190978
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