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# Exclusive $J/\psi$ and $\psi(2S)$ production in $pp$ collisions at $\sqrt{s}=7$ TeV

Abstract : Exclusive $J/\psi$ and $\psi(2S)$ vector meson production has been observed in the dimuon channel using the LHCb detector. The cross-section times branching fractions to two muons with pseudorapidities between 2.0 and 4.5 are measured to be $\sigma_{pp\rightarrow J/\psi (\rightarrow \mu^{+} \mu^{-})} (2.0 <\eta_{\mu^{\pm}}< 4.5) = 307 \pm 21 \pm 36~\text{pb}, \sigma_{pp\rightarrow \psi(2S) (\rightarrow \mu^{+} \mu^{-})} (2.0 <\eta_{\mu^{\pm}}< 4.5) = 7.8 \pm 1.3 \pm 1.0~\text{pb},$ where the first uncertainties are statistical and the second are systematic. The measurements are found to be in good agreement with results from previous experiments and theoretical predictions. The $J/\psi$ photoproduction cross-section has been measured as a function of the photon-proton centre-of-mass energy. The results are consistent with measurements obtained at HERA and confirm a similar power law behaviour for the photoproduction cross-section.
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Journal articles
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http://hal.in2p3.fr/in2p3-00783343
Contributor : Danielle Cristofol <>
Submitted on : Friday, February 1, 2013 - 8:25:39 AM
Last modification on : Thursday, February 25, 2021 - 10:58:32 AM

### Citation

R. Aaij, C. Abellan Beteta, A. Adametz, B. Adeva, M. Adinolfi, et al.. Exclusive $J/\psi$ and $\psi(2S)$ production in $pp$ collisions at $\sqrt{s}=7$ TeV. Journal of Physics G: Nuclear and Particle Physics, IOP Publishing, 2013, 40, pp.045001. ⟨10.1088/0954-3899/40/4/045001⟩. ⟨in2p3-00783343⟩

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