Study of exclusive photoproduction of charmonium in ultra-peripheral lead-lead collisions
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13130_2023_Article_21142.pdf
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Author(s)
Aaij, R.
Abdelmotteleb, A. S. W.
Abellan Beteta, C.
Abudinén, F.
Ackernley, T.
Adeva, B.
Adinolfi, M.
Afsharnia, H.
Agapopoulou, C.
Aidala, C. A.
Date Issued
June 23, 2023
Publisher
Springer Berlin Heidelberg
Citation
Journal of High Energy Physics. 2023 Jun 23;2023(6):146
Version
Final published version
Abstract
Abstract
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
J
/
ψ
coh
$$ {\sigma}_{J/\psi}^{\textrm{coh}} $$
= 5.965 ± 0.059 ± 0.232 ± 0.262 mb and
σ
ψ
2
S
coh
$$ {\sigma}_{\psi (2S)}^{\textrm{coh}} $$
= 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
ψ
2
S
coh
/
σ
J
/
ψ
coh
$$ {\sigma}_{\psi (2S)}^{\textrm{coh}}/{\sigma}_{J/\psi}^{\textrm{coh}} $$
= 0.155 ± 0.014 ± 0.003, where the first uncertainty is statistical and the second is systematic. These results are compatible with theoretical predictions.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1007/JHEP06(2023)146
