For a top quark of large mass certain processes, normally suppressed by the extended Glashow-Iliopoulos-Maiani mechanism, may proceed at a measurable rate. We examine the induced decays $b\to s+\gamma$, $B_s\to {\tau }^{+}{\tau }^{-}$, and $B_s\to \gamma \gamma$ and the mixings of $B_d \left({\overline{B}}_d\right)$ and $B_s \left({\overline{B}}_s\right)$ mesons; the $b\to s+\gamma$ decay and the neutral-meson mixings give sensitive tests of the top-quark mass.

• Received 22 May 1981

DOI:https://doi.org/10.1103/PhysRevD.25.1989