Search at D\O\ for Inclusive $WZ$ Diboson Events in Trilepton Final States at $\sqrt(s)=1.96$ TeV

Presented is a study of searching for $WZ$ diboson events in trilepton final states using data on $p\bar{p}$ collision collected by the D\O\ experiment during 2002-2004 at the Fermilab Tevatron at a center-of-mass energy of 1.96 {\rm TeV}. The cleanest experimental signal for the $WZ$ events is from a pair of leptons ($e^+e^-$ or $\mu^+\mu^-$) from the decay of the Z boson, and another lepton ($e$ or $\mu$) with large transverse momentum ($p_T$) and a large imbalance $p_T$ in the event (missing neutrino) from the leptonic decay of the W boson. Three trilepton events with the $WZ$ decay characteristics is observed in D\O\ data. With an estimated background of $0.66\pm 0.11$ events and integrated luminosities ranging from 285 - 320 ${\rm pb}^{-1}$ for different trilepton final states, we measure the $WZ$ production cross section to be $4.4^{+3.8}_{-2.5}$~{\rm pb} and set a 95\% confidence level upper limit of $13.2$~{\rm pb}. We also obtain 95\% confidence limit contours for $\lambda_Z$ vs.$\Delta g_1^Z$ and $\Delta\kappa_Z$ vs.$\lambda_Z$ using a form factor of $\Lambda = 1$~{\rm TeV}.