Decays ofBMesons to Kaons without Charm and the Top-Quark Mass

Decays of $B$ mesons to kaons without charmed particles are shown to be sensitive to the top-quark mass, and therefore can be used to determine $m_t$ or at least to set limits on it. For $m_t\simeq 2M_W$ the inclusive branching ratio is about 2%, while for $m_t\simeq 20$ GeV it is only 0.4%. The flavor-changing transition $b\to s+\mathrm{gluon}$ is calculated and added to the penguin and the direct decay ($b\to u\overline{u}s$) contributions.