Exclusive Dimuon production at LHCb.

Dermot Moran
We report on preliminary results for the measurement of exclusive dimuon production at LHCb. Cross-section measurements for exclusive $J/\psi$, $\psi\prime$ and for non-resonant production $p+p\rightarrow p+ \mu^+ \mu^- +p$ are presented and comparisons made with theory. The additional requirement of a single photon allows the the cross-section for exclusive $\chi_c$ production to be measured and also the relative contribution of $\chi_c^0$,$\chi_c^1$,$\chi_c^2$ to be determined.