Measurement of electroweak production of a W boson in association with two jets in proton–proton collisions at √s=13\,TeV

A measurement is presented of electroweak (EW) production of a W W boson in association with two jets in proton–proton collisions at √s=13\,TeV s=13Te . The data sample was recorded by the CMS Collaboration at the LHC and corresponds to an integrated luminosity of 35.9 \,fb⁻¹ fb-1 . The measurement is performed for the ν ℓν jj final state (with ν ℓν indicating a lepton–neutrino pair, and j representing the quarks produced in the hard interaction) in a kinematic region defined by invariant mass mⱼj >120\,GeV mjj>120Ge and transverse momenta pT j > 25\,GeV pTj>25Ge . The cross section of the process is measured in the electron and muon channels yielding σ EW(W jj)= 6.23 ± 0.12 \,(stat) ± 0.61 \,(syst) \,pb σEW(Wjj)=6.23±0.12(stat)±0.61(syst)pb per channel, in agreement with leading-order standard model predictions. The additional hadronic activity of events in a signal-enriched region is studied, and the measurements are compared with predictions. The final state is also used to perform a search for anomalous trilinear gauge couplings. Limits on anomalous trilinear gauge couplings associated with dimension-six operators are given in the framework of an effective field theory. The corresponding 95% confidence level intervals are -2.3< c_W W W/ ² < 2.5\,TeV ⁻² -2.3<cWWW/Λ2<2.5Te-2 , -8.8< cW/ ² < 16\,TeV ⁻² -8.8<cW/Λ2<16Te-2 , and -45< cB/ ² < 46\,TeV ⁻² -45<cB/Λ2<46Te-2 . These results are combined with the CMS EW Zjj Zjj analysis, yielding the constraint on the c_W W W cWWW coupling: -1.8< c_W W W/ ² < 2.0\,TeV ⁻² -1.8<cWWW/Λ2<2.0Te-2 .