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 ${\sigma }_{pp\to J/\psi (\to {\mu }^{+}{\mu }^{-})}(2.0<{\eta }_{{\mu }^{\pm }}<4.5)=307\pm 21\pm 36\text{pb},{\sigma }_{pp\to \psi (2S)(\to {\mu }^{+}{\mu }^{-})}(2.0<{\eta }_{{\mu }^{\pm }}<4.5)=7.8\pm 1.3\pm 1.0\text{pb},$ 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.

15 pages, 6 figures

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