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

LHCb collaboration, R. Aaij, C. Abellan Beteta +620

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 p…