CMS-PAS-FSQ-12-010

CMS-PAS-FSQ-12-010
Search for exclusive two-photon production of $W^{+}W^{-}$ pairs in $pp$ collisions at 7~TeV
CMS Collaboration
2013

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.
Links: CDS record (PDF) ; inSPIRE record ; Public twiki page ; CADI line (restricted) ; These preliminary results are superseded in this paper, JHEP 07 (2013) 116. The superseded preliminary plots can be found here.

CMS Publications