# Exclusive J/ψ and ψ(2S) production in pp collisions at s√=7 TeV

LHCb Collaboration; et al; Bernet, R; Müller, K; Steinkamp, O; Straumann, U; Vollhardt, A (2013). Exclusive J/ψ and ψ(2S) production in pp collisions at s√=7 TeV. Journal of Physics G: Nuclear and Particle Physics, 40(4):045001.

## Abstract

Exclusive J/ψ and ψ(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{eqnarray*} \sigma _{pp\rightarrow {J /\psi } (\rightarrow \mu ^{+} \mu ^{-})} (2.0 <\eta _{\mu ^{\pm }}< 4.5) = 307 \pm 21 \pm 36\ {\rm pb},\\ \sigma _{pp\rightarrow \psi {(2S)} (\rightarrow \mu ^{+} \mu ^{-})} (2.0 <\eta _{\mu ^{\pm }}< 4.5) = 7.8 \pm 1.3 \pm 1.0\ {\rm pb}, \end{eqnarray*} 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/ψ 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.

## Abstract

Exclusive J/ψ and ψ(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{eqnarray*} \sigma _{pp\rightarrow {J /\psi } (\rightarrow \mu ^{+} \mu ^{-})} (2.0 <\eta _{\mu ^{\pm }}< 4.5) = 307 \pm 21 \pm 36\ {\rm pb},\\ \sigma _{pp\rightarrow \psi {(2S)} (\rightarrow \mu ^{+} \mu ^{-})} (2.0 <\eta _{\mu ^{\pm }}< 4.5) = 7.8 \pm 1.3 \pm 1.0\ {\rm pb}, \end{eqnarray*} 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/ψ 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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