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

The LHCb collaboration
J.Phys. G40 (2013) 045001, 2013.

Abstract (data abstract)
CERN-LHC. 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 \begin{equation*} \sigma_{pp\rightarrow J/\psi (\rightarrow \mu^{+} \mu^{-})} (2.0 <\eta_{\mu^{\pm}}< 4.5) = 307 \pm 21 \pm 36~\text{pb}, \end{equation*} \begin{equation*} \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}, \end{equation*} 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 This analysis uses 36pb-1 data taken in 2010. An update to this measurement using 930pb-1 data taken in 2011 is given in the record http://hepdata.cedar.ac.uk/view/ins1277076 (arXiv:1401.3288).

  • Table 1

    Data from T 3


    Cross section times branching ratio to two muons with pseudorapidities between 2.0 and 4.5.

  • Table 2

    Data from T 4


    Cross-section measurements (nb) as a function of $J/\psi$ rapidity.

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