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

Abstract

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 35.9 fb${}^{-1}$. The measurement is performed for the $\ell \nu$jj final state (with $\ell \nu$ indicating a lepton-neutrino pair, and j representing the quarks produced in the hard interaction) in a kinematic region defined by invariant mass $m_{\mathrm{jj}}$ $>$ 120 GeV and transverse momenta $p_{\mathrm{Tj}}$ $>$ 25 GeV. The cross section of the process is measured in the electron and muon channels yielding ${\sigma }_{\mathrm{EW}}$(Wjj) = 6.23 $\pm$ 0.12 (stat) $\pm$ 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 $<$ $c_{\mathrm{WWW}}/{\Lambda }^2$ $<$ 2.5 TeV${}^{-2}$, $-$8.8 $<$ $c_{\mathrm{W}}/{\Lambda }^2$ $<$ 16 TeV${}^{-2}$, and $-$45 $<$ $c_{\mathrm{B}}/{\Lambda }^2$ $<$ 46 TeV${}^{-2}$. These results are combined with the CMS EW Zjj analysis, yielding the constraint on the $c_{\mathrm{WWW}}$ coupling: $-$1.8 $<$ $c_{\mathrm{WWW}}/{\Lambda }^2$ $<$ 2.0 TeV${}^{-2}$.

Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/SMP-17-011 (CMS Public Pages)