Production of $WZ$ Events in $p\overline{p}$ Collisions at $\sqrt{s}=1.96\mathrm{TeV}$ and Limits on Anomalous $WWZ$ Couplings

We present results from a search for $WZ$ production with subsequent decay to $\ell \nu {\ell }^{\prime }{\overline{\ell }}^{\prime }$ ($\ell$ and ${\ell }^{\prime }=e$ or $\mu$) using $0.30{\mathrm{fb}}^{-1}$ of data collected by the D0 experiment between 2002 and 2004 at the Fermilab Tevatron. Three events with $WZ$ decay characteristics are observed. With an estimated background of $0.71\pm 0.08$ events, we measure the $WZ$ production cross section to be ${4.5}_{-2.6}^{+3.8}\mathrm{pb}$, with a 95% C.L. upper limit of 13.3 pb. The 95% C.L. limits for anomalous $WWZ$ couplings are found to be $-2.0<\Delta {\kappa }_Z<2.4$ for form factor scale $\Lambda =1\mathrm{TeV}$, and $-0.48<{\lambda }_Z<0.48$ and $-0.49<\Delta g_1^Z<0.66$ for $\Lambda =1.5\mathrm{TeV}$.