Exclusive Diplepton Production

We present a first study of exclusive production of dileptons in CMS, by selecting events with a single back-to-back $\mu^{+}\mu^{-}$ or $e^{+}e^{-}$ pair and no significant additional activity in the detector. These events result from two-photon exchange and photoproduction of $\Upsilon$ mesons. The two-photon events potentially provide a high-statistics calibration sample for luminosity normalization and alignment of forward proton detectors. The $\Upsilon$ sample will allow studies of heavy flavor photoproduction at higher energies than previous experiments.