Search for $ZZ$ and $ZW$ production in $p\overline{p}$ collisions at $\sqrt{s}=1.96\mathrm{TeV}$

We present a search for $ZZ$ and $ZW$ vector boson pair production in $p\overline{p}$ collisions at $\sqrt{s}=1.96\mathrm{TeV}$ using the leptonic decay channels $ZZ\to ll\nu \nu$, $ZZ\to ll{l}^{\prime }{l}^{\prime }$, and $ZW\to ll{l}^{\prime }\nu$. In a data sample corresponding to an integrated luminosity of $194{\mathrm{pb}}^{-1}$ collected with the Collider Detector at Fermilab, 3 candidate events are found with an expected background of $1.0\pm 0.2$ events. We set a 95% confidence level upper limit of 15.2 pb on the cross section for $ZZ$ plus $ZW$ production, compared to the standard model prediction of $5.0\pm 0.4\mathrm{pb}$.

Figure 1

Distributions of (a) lepton $p_T$ and (b) lepton $\eta$ of the candidate data events, and the expected SM contributions in the two-lepton plus ${\mathrm{E̸}}_T$ category.