Is the Top Quark Really Heavier than the $W$ Boson?

Abstract

Scalar induced top decays may drastically suppress $B(t\to \ellν+ jet)$ and still hide the top below $M_W$. The $p\bar p$ collider experiments should enlarge the scope and study the $m_t - B(t\to\ellνj)$ plane. Specific model signatures such as $t\to ch^0\to cb\bar b$ (multiple high $p_T$ $b$-jets) and $t\to bH^+\to bc\bar s$, $bτ^+ν$ (with $B(t\to bτν) \ \raisebox{-.5ex}{\rlap{$\sim$}} \raisebox{.4ex}{$<$}\ 1/3$) should be explored. Without ruling out these possibilities, isolated lepton signals in the future might actually be due to the 4th generation $t^\prime$ or $b^\prime$ quark, while top quark and toponium physics could still turn up at LEP-II.