Central exclusive J/{ \psi} and { \chi}c meson production has been measured in decays to dimuons with the LHCb detector, in data corresponding to 36 /pb of integrated luminosity from \sqrt{ s} = 7 TeV proton-proton collisions. Cross-section measurements for J/{ \psi}, { \psi}(2S) and { \chi}c0,c1,c2 production are presented, and the J/{ \psi} photoproduction cross-section is measured as a function of the photon-proton centre-of-mass energy and compared to measurements made at HERA.
Categories: hep-ex