Measurement of trilinear gauge boson couplings from WW + WZ to lnu jj events in pp-bar collisions at sqrt{s}=1.96 TeV

TL;DR

This paper reports a direct measurement of trilinear gauge boson couplings in WW and WZ events from proton-antiproton collisions at 1.96 TeV, using data from the D0 detector, providing constraints consistent with the Standard Model.

Contribution

First direct measurement of gammaWW and ZWW couplings in WW and WZ events at Tevatron energies with detailed coupling constraints.

Findings

Measured couplings consistent with Standard Model predictions.

Provided 68% confidence level limits on gammaWW and ZWW couplings.

Compared different coupling scenarios with consistent results.

Abstract

We present a direct measurement of trilinear gauge boson couplings at gammaWW and ZWW vertices in WW and WZ events produced in pp-bar collisions at sqrt{s}=1.96 TeV. We consider events with one electron or muon, missing transverse energy, and at least two jets. The data were collected using the D0 detector and correspond to 1.1/fb of integrated luminosity. Considering two different relations between the couplings at the gammaWW and ZWW vertices, we measure these couplings at 68% C.L. to be kappa_{gamma}=1.07^{+0.26}_{-0.29}, lambda =0.00^{+0.06}_{-0.06} and g_{1}^{Z}=1.04^{+0.09}_{-0.09} in a scenario respecting SU(2)_L x U(1)_Y gauge symmetry and kappa =1.04^{+0.11}_{-0.11} and lambda=0.00^{+0.06}_{-0.06} in an "equal couplings" scenario.