An upper limit on the branching ratio of the decay $K^{+}$→${\pi }^{+}$H, H→${\mu }^{+}$${\mu }^{\mathrm{-}}$ is set at 1.5×${10}^{\mathrm{-}7}$ at the 90% confidence level, for a Higgs-boson mass in the interval 220<$m_H$<320 MeV/$c^2$. In addition, 90%-confidence-level upper limits on the branching ratios of the decays $K^{+}$→${\pi }^{+}$${\mu }^{+}$${\mu }^{\mathrm{-}}$ and $K^{+}$→${\mu }^{+}$ν${\mu }^{+}$${\mu }^{\mathrm{-}}$ are set at 2.3×${10}^{\mathrm{-}7}$ and 4.1×${10}^{\mathrm{-}7}$, respectively.

• Received 18 July 1989

DOI:https://doi.org/10.1103/PhysRevLett.63.2177