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We study WW and WZ production with $l\nu q{q}$ ($l=e,\mu$) final states usingdata collected by the D0 detector at the Fermilab Tevatron Collidercorresponding to 4.3 fb^-1 of integrated luminosity from p-pbar collisions atsqrt{s}=1.96 TeV. Assuming the ratio between the production cross sections$\sigma(WW)$ and $\sigma(WZ)$ as predicted by the standard model, we measurethe total WV (V=W,Z) cross section to be $\sigma(WV)= 19.6^{+3.2}_{-3.0}$ pb,and reject the background-only hypothesis at a level of 7.9 standarddeviations. We also use b-jet discrimination to separate the WZ component fromthe dominant WW component. Simultaneously fitting WW and WZ contributions, wemeasure $\sigma(WW) = 15.9^{+3.7}_{-3.2}$ pb and $\sigma(WZ) =3.3^{+4.1}_{-3.3}$ pb, which is consistent with the standard model predictions.

Measurements of WW and WZ production in W + jets final states in p-pbar collisions