Measurement of electroweak production of a W boson in association with two jets in proton–proton collisions at $\sqrt{s}$=13 TeV

A measurement is presented of electroweak (EW) production of a W boson in association with two jets in proton–proton collisions at $\sqrt{s}$=13 TeV. The data sample was recorded by the CMS Collaboration at the LHC and corresponds to an integrated luminosity of 35.9fb${}^{-1}$. The measurement is performed for the ℓνjj final state (with ℓν indicating a lepton–neutrino pair, and j representing the quarks produced in the hard interaction) in a kinematic region defined by invariant mass m${}_{jj}$>120 GeV and transverse momenta p${}_{Tj}$>25 GeV. The cross section of the process is measured in the electron and muon channels yielding σ${}_{EW}$ (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 -2.3WWW/Λ${}^2$<2.5 TeV${}^{-2}$, -8.8W/Λ${}^2$<16 TeV${}^{-2}$, and -45B/Λ${}^2$<46 TeV${}^{-2}$. These results are combined with the CMS EW Zjj analysis, yielding the constraint on the c${}_{WWW}$ coupling: -1.8WWW/Λ${}^2$<2.0 TeV${}^{-2}$.