We present a search for dilepton events from $t\overline{t}$ production with one electron or muon and one hadronically decaying $\tau$ lepton from the decay $t\overline{t}\to \left(\ell {\nu }_{\ell }\right)\left(\tau {\nu }_{\tau }\right)b\overline{b}$, $(\ell =e,\mu )$, using the Collider Detector at Fermilab. In a $109{\mathrm{pb}}^{-1\mathrm{}}$ data sample of $p\overline{p}$ collisions at $\sqrt{s}=1.8\mathrm{}\mathrm{TeV}$ we expect $\sim 1$ signal event and a total background of $\sim 2$ events; we observe 4 candidate events ( $2e\tau$ and $2\mu \tau$). Three of these events have jets identified as $b$ candidates, compared to an estimated background of $0.28\pm 0.02$ events.

• Received 15 April 1997

DOI:https://doi.org/10.1103/PhysRevLett.79.3585