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.
Categories: hep-ex