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Observation of electroweak production of same-sign W boson pairs in the two jet and two same-sign lepton final state in proton-proton collisions at $\sqrt{s} =$ 13 TeV

The collaboration
Phys.Rev.Lett. 120 (2018) 081801, 2018.

Abstract (data abstract)
The first observation of electroweak production of same-sign W boson pairs in proton-proton collisions is reported. The data sample corresponds to an integrated luminosity of 35.9fb-1 collected at a center-of-mass energy of 13TeV with the CMS detector at the LHC. Events are selected by requiring exactly two leptons (electrons or muons) of the same charge, moderate missing transverse momentum, and two jets with a large rapidity separation and a large dijet mass. The observed significance of the signal is 5.5 standard deviations, where a significance of 5.7 standard deviations is expected based on the standard model. The ratio of measured event yields to that expected from the standard model at leading-order is 0.90 +/- 0.22. A cross section measurement in a fiducial region is reported. Bounds are given on the structure of quartic vector boson interactions in the framework of dimension-eight effective field theory operators and on the production of doubly charged Higgs bosons.

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Data from P 4

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The measured W+W+ EWK fiducual cross section.

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Data from Figure 2

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Data and estimated signal and background yields after the selection in the two dimensional dijet-dilepton mass distributions. This is used...

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Data from Figure 2

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Data and estimated signal and background yields after the selection in the one dimensional dilepton mass distribution. This is used...

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Data from Figure 3 left

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Expected and observed 95% CL upper limits on the cross section times branching fraction, $\sigma_{\mathrm{VBF}}(H^{\pm\pm}) \times \mathrm{{\it B}}(H^{\pm\pm} \to W^{\pm}W^{\pm})$,...

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Data from Figure 3 right

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Expected and observed 95% CL upper limits on $s_H$ in the Georgi--Machacek model as a function of doubly charged Higgs...

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Data from Table 2

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Observed and expected 95% CL limits on the coefficients for higher-order (dimension-eight) operators in the effective field theory Lagrangian.

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Main systematic uncertainties in the analysis.

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Signal efficiency from the generator level fiducial definition to the reconstruction level selection for the dilepton mass variable.