photon-photon and photon-p measurements with forward proton taggers in CMS+TOTEM

The CMS+TOTEM Precision Proton Spectrometer operated for the first time in 2016, collecting data during pp collisions at $\sqrt{s}=13~\mathrm{TeV}$ at the CERN Large Hadron Collider. Procedures for the detector alignment, optics corrections, and background estimations were developed, and applied to an analysis of the process $pp \rightarrow p \mu^{+}\mu^{-}p^{(\ast)}$ with dimuon masses larger than $110~\mathrm{GeV}$. A total of 12 candidate events are observed, corresponding to an excess of $>4\sigma$ over the background prediction. This constitutes the first evidence for this process at such masses, and demonstrates the good performance of CT-PPS.