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Compact Muon Solenoid
LHC, CERN

CMS-PAS-FSQ-12-010
Search for exclusive two-photon production of $W^{+}W^{-}$ pairs in $pp$ collisions at 7~TeV
Abstract: A search for exclusive or quasi-exclusive $W^{+}W^{-}$ production by two-photon exchange, $pp \rightarrow p^{(*)}W^{+}W^{-}p^{(*)}$,at $\sqrt{s}$~=~7~TeV is reported using data collected by the CMS detector corresponding to an integrated luminosity of 5.05~fb$^{-1}$. Events are selected by requiring a $\mu^{\pm}e^{\mp}$ vertex with no associated charged tracks, and dilepton transverse momentum $\pt(\mu^{\pm}e^{\mp})>$~30~GeV. Two events passing all selection requirements are observed in the data, compared to a Standard Model expectation of .2 \pm 0.5$ signal events with .84 \pm 0.13$ background. The tail of the dilepton transverse momentum distribution, with $\pt(\mu^{\pm}e^{\mp})>$~100~GeV, is studied for deviations from the Standard Model. No events are observed in this region, and the resulting upper limits are compared to predictions involving anomalous quartic gauge couplings.
Compact Muon Solenoid
LHC, CERN