Compact Muon Solenoid
LHC, CERN
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| CMS-PAS-FSQ-13-008 | ||
| Evidence for exclusive gamma-gamma to $\mathrm{W^+ W^-}$ production and constraints on Anomalous Quartic Gauge Couplings at $ \sqrt{s} =$ 8 TeV | ||
| CMS Collaboration | ||
| June 2015 | ||
| Abstract: A search for exclusive or quasi-exclusive $\gamma\gamma \rightarrow \mathrm{ W^{+}W^{-} }$ production, $ \mathrm{pp \rightarrow p^{(*)} W^{+}W^{-} p^{(*)} \to p^{(*)} \mu^{\pm} e^{\mp} p^{(*)} } $, at $\sqrt{s} =$ 8 TeV is reported using data corresponding to an integrated luminosity of 19.7 fb$^{-1}$. Events are selected by requiring the presence of an electron-muon pair with large transverse momentum $p_{\mathrm{T}}(\mu^{\pm} \mathrm{e}^{\mp})> $ 30 GeV and no associated charged particles detected from the same vertex. In the signal region 13 events are observed over an expected background of 3.5 $\pm$ 0.5 events, corresponding to an excess of 3.6$\sigma$ over the background-only hypothesis. The observed yields and kinematic distributions are compatible with the Standard Model prediction for exclusive and quasi-exclusive $\gamma\gamma \rightarrow \mathrm{ W^{+}W^{-} } $ production. The dilepton transverse momentum spectrum is studied for deviations from the Standard Model, and the resulting upper limits are compared to predictions assuming anomalous quartic gauge couplings. | ||
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Links:
CDS record (PDF) ;
inSPIRE record ;
Public twiki page ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, JHEP 08 (2016) 119. The superseded preliminary plots can be found here. |
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Compact Muon Solenoid LHC, CERN |
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