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

## TL;DR

This paper reports a precise measurement of electroweak W boson production with two jets at 13 TeV, confirming Standard Model predictions and setting limits on anomalous gauge couplings using CMS data.

## Contribution

First measurement of electroweak Wjj production at 13 TeV with detailed analysis and constraints on anomalous gauge couplings within an effective field theory framework.

## Key findings

- Measured cross section: 6.23 ± 0.12 (stat) ± 0.61 (syst) pb.
- Set 95% CL limits on anomalous couplings: $c_{WWW}/\,\Lambda^2$ between -2.3 and 2.5 TeV$^{-2}$.
- Combined analysis with Zjj channel improves constraints on $c_{WWW}$.

## 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 $p_\mathrm{T j}$ $>$ 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$^{-2}$.