Central exclusive production of J/psi and (2S) mesons in pp collisions at p s=13 TeV

Aaij, R, Adeva, B, Adinolfi, M, Aidala, CA, Ajaltouni, Z, Akar, S, Albicocco, P, Albrecht, J, Alessio, F, Alexander, M
et al (show 802 more authors) (2018) Central exclusive production of J/psi and (2S) mesons in pp collisions at p s=13 TeV. JOURNAL OF HIGH ENERGY PHYSICS, 10 (10). 167-.

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Measurements are reported of the central exclusive production of \jpsi and \psitwos mesons in $pp$ collisions at a centre-of-mass energy of 13 TeV. Backgrounds are significantly reduced compared to previous measurements made at lower energies through the use of new forward shower counters. The products of the cross-sections and the branching fractions for the decays to dimuons, where both muons are within the pseudorapidity range $2.0<\eta<4.5$, are measured to be $$ \begin{array}{rcl} \sigma_{J/\psi\rightarrow\mu^+\mu^-}&=&435 \pm 18 \pm 17 \pm 16 {\rm \ pb},\\ \sigma_{\psi(2S)\rightarrow\mu^+\mu^-}&=&11.1 \pm 1.1 \pm 0.3 \pm 0.4 {\rm \ pb}.\\ \end{array} $$ The first uncertainties are statistical, the second are systematic, and the third are due to the luminosity determination. The cross-sections are also measured differentially for meson rapidities between 2.0 and 4.5. Good agreement is observed with theoretical predictions. Photoproduction cross-sections are derived and compared to previous experiments, and a deviation from a pure power-law extrapolation of lower energy data is observed.

Item Type: Article
Additional Information: All figures and tables, and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2018-011.html
Uncontrolled Keywords: Charm physics, Forward physics, Hadron-Hadron scattering (experiments), Particle and resonance production, Quarkonium
Depositing User: Symplectic Admin
Date Deposited: 03 Dec 2018 10:25
Last Modified: 19 Jan 2023 01:11
DOI: 10.1007/JHEP10(2018)167
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3029291