New Decay Modes of theΛc+Charmed Baryon

We have observed five new decay modes of the charmed baryon ${\Lambda }_c^{+}$ using data collected with the CLEO II detector. Four decay modes, ${\Lambda }_c^{+}\to p{\overline{K}}^0\eta$, $\Lambda \eta {\pi }^{+}$, ${\Sigma }^{+}\eta$, and ${\Sigma }^{*+}\eta$, are first observations of final states with an $\eta$ meson, while the fifth mode, ${\Lambda }_c^{+}\to \Lambda {\overline{K}}^0{K}^{+}$, requires the creation of an $s\overline{s}$ quark pair. We measure the branching fractions of these modes relative to ${\Lambda }_c^{+}\to {\mathrm{pK}}^{-}{\pi }^{+}$ to be $0.25\pm 0.04\pm 0.04$, $0.35\pm 0.05\pm 0.06$, $0.11\pm 0.03\pm 0.02$, $0.17\pm 0.04\pm 0.03$, and $0.12\pm 0.02\pm 0.02$, respectively.