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Abstract

We report measurements of the decays ${\ensuremath{\Lambda}}_{c}^{+}\ensuremath{\rightarrow}p{\overline{K}}^{0}$, ${\ensuremath{\Lambda}}_{c}^{+}\ensuremath{\rightarrow}p{\overline{K}}^{0}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$, ${\ensuremath{\Lambda}}_{c}^{+}\ensuremath{\rightarrow}{\ensuremath{\Lambda}}^{0}{\ensuremath{\pi}}^{+}$, and ${\ensuremath{\Lambda}}_{c}^{+}\ensuremath{\rightarrow}{\ensuremath{\Lambda}}^{0}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ from Fermilab photoproduction experiment E691. We have measured the relative branching ratios $\frac{B({\ensuremath{\Lambda}}_{c}^{+}\ensuremath{\rightarrow}p{\overline{K}}^{0})}{B({\ensuremath{\Lambda}}_{c}^{+}\ensuremath{\rightarrow}p{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+})}=0.55\ifmmode\pm\else\textpm\fi{}0.17\ifmmode\pm\else\textpm\fi{}0.14$, $\frac{B({\ensuremath{\Lambda}}_{c}^{+}\ensuremath{\rightarrow}{\ensuremath{\Lambda}}^{0}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}})}{B({\ensuremath{\Lambda}}_{c}^{+}\ensuremath{\rightarrow}p{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+})=0.82\ifmmode\pm\else\textpm\fi{}0.29\ifmmode\pm\else\textpm\fi{}0.27}$, $\frac{B({\ensuremath{\Lambda}}_{c}^{+}\ensuremath{\rightarrow}{\ensuremath{\Lambda}}^{0}{\ensuremath{\pi}}^{+})}{B({\ensuremath{\Lambda}}_{c}^{+}\ensuremath{\rightarrow}p{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+})<0.33}$ at 90% confidence level, and $\frac{B({\ensuremath{\Lambda}}_{c}^{+}\ensuremath{\rightarrow}p{\overline{K}}^{0}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}})}{B({\ensuremath{\Lambda}}_{c}^{+}\ensuremath{\rightarrow}p{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+})}<1.7$ at 90% confidence level.

Study of decays of theΛc+

Abstract

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