Diboson production ($WW+WZ+ZZ$) has been observed at the Tevatron in hadronic decay modes dominated by the $WW$ process. This paper describes the measurement of the cross section of $WZ$ and $ZZ$ events in final states with large ${\mathrm{E̸}}_T$ and using $b$-jet identification as a tool to suppress $WW$ contributions. Because of the limited energy resolution, we cannot distinguish between partially hadronic decays of $WZ$ and $ZZ$, and we measure the sum of these processes. The number of signal events is extracted using a simultaneous fit to the invariant mass distribution of the two jets for events with two $b$-jet candidates and events with fewer than two $b$-jet candidates. We measure a cross section $\sigma (p\overline{p}\to WZ,ZZ)={5.8}_{-3.0}^{+3.6}\mathrm{pb}$, in agreement with the standard model.

• Received 11 August 2011

DOI:https://doi.org/10.1103/PhysRevD.85.012002