TY  - JOUR
AU  - LHCb Collaboration (Aaij, R. et al
AU  - Jaimes Elles, S. J.
AU  - Jashal, B. K.
AU  - Martinez-Vidal, F.
AU  - Oyanguren, A.
AU  - Rebollo De Miguel, M.
AU  - Remon Alepuz, C.
AU  - Ruiz Vidal, J.
AU  - Sanderswood, I.
PY  - 2023
DA  - 2023//
TI  - Study of exclusive photoproduction of charmonium in ultra-peripheral lead-lead collisions
T2  - J. High Energy Phys.
JO  - Journal of High Energy Physics
SP  - 146
EP  - 25pp
VL  - 06
IS  - 6
PB  - Springer
KW  - Heavy Ion Experiments
KW  - Heavy-Ion Collision
KW  - Photon Production
KW  - Quarkonium
AB  - The cross-sections of exclusive (coherent) photoproduction J/psi and (2S) mesons in ultra-peripheral PbPb collisions at a nucleon-nucleon centre-of-mass energy of 5.02TeV 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/psi and psi(2S) mesons. The integrated cross-sections are measured to be sigma(coh)(J/psi) = 5.965 +/- 0.059 +/- 0.232 +/- 0.262mb and sigma(coh)(psi(2S)) = 0.923 +/- 0.086 +/- 0.028 +/- 0.040mb, 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 sigma(coh)(psi(2S)) /sigma(coh)(J/psi) = 0.155 +/- 0.014 +/- 0.003, where the first uncertainty is statistical and the second is systematic. These results are compatible with theoretical predictions.
SN  - 1029-8479
UR  - https://arxiv.org/abs/2206.08221
UR  - https://doi.org/10.1007/JHEP06(2023)146
DO  - 10.1007/JHEP06(2023)146
LA  - English
N1  - WOS:001035231500001
ID  - LHCbCollaborationAaij_etal2023
ER  -