Measurement of branching fractions of Λc+→ηΛπ+, ηΣ0π+, Λ(1670)π+, and ηΣ(1385)+

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Abstract

We report branching fraction measurements of four decay modes of the ${\mathrm{\ensuremath{\Lambda}}}_{c}^{+}$ baryon, each of which includes an $\ensuremath{\eta}$ meson and a $\mathrm{\ensuremath{\Lambda}}$ baryon in the final state, and all of which are measured relative to the ${\mathrm{\ensuremath{\Lambda}}}_{c}^{+}\ensuremath{\rightarrow}p{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}$ decay mode. The results are based on a $980\text{ }\text{ }\mathrm{f}{\mathrm{b}}^{\ensuremath{-}1}$ data sample collected by the Belle detector at the KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider. Two decays, ${\mathrm{\ensuremath{\Lambda}}}_{c}^{+}\ensuremath{\rightarrow}\ensuremath{\eta}{\mathrm{\ensuremath{\Sigma}}}^{0}{\ensuremath{\pi}}^{+}$ and $\mathrm{\ensuremath{\Lambda}}(1670){\ensuremath{\pi}}^{+}$, are observed for the first time, while the measurements of the other decay modes, ${\mathrm{\ensuremath{\Lambda}}}_{c}^{+}\ensuremath{\rightarrow}\ensuremath{\eta}\mathrm{\ensuremath{\Lambda}}{\ensuremath{\pi}}^{+}$ and $\ensuremath{\eta}\mathrm{\ensuremath{\Sigma}}(1385{)}^{+}$, are more precise than those made previously. We obtain relative branching fractions of $\mathcal{B}({\mathrm{\ensuremath{\Lambda}}}_{c}^{+}\ensuremath{\rightarrow}\ensuremath{\eta}\mathrm{\ensuremath{\Lambda}}{\ensuremath{\pi}}^{+})/\phantom{\rule{0ex}{0ex}}\mathcal{B}({\mathrm{\ensuremath{\Lambda}}}_{c}^{+}\ensuremath{\rightarrow}p{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+})=0.293\ifmmode\pm\else\textpm\fi{}0.003\ifmmode\pm\else\textpm\fi{}0.014$, $\mathcal{B}({\mathrm{\ensuremath{\Lambda}}}_{c}^{+}\ensuremath{\rightarrow}\ensuremath{\eta}{\mathrm{\ensuremath{\Sigma}}}^{0}{\ensuremath{\pi}}^{+})/\mathcal{B}({\mathrm{\ensuremath{\Lambda}}}_{c}^{+}\ensuremath{\rightarrow}p{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+})=0.120\ifmmode\pm\else\textpm\fi{}0.006\ifmmode\pm\else\textpm\fi{}0.010$, $\mathcal{B}({\mathrm{\ensuremath{\Lambda}}}_{c}^{+}\ensuremath{\rightarrow}\mathrm{\ensuremath{\Lambda}}(1670){\ensuremath{\pi}}^{+})\ifmmode\times\else\texttimes\fi{}\mathcal{B}(\mathrm{\ensuremath{\Lambda}}(1670)\ensuremath{\rightarrow}\ensuremath{\eta}\mathrm{\ensuremath{\Lambda}})/\mathcal{B}({\mathrm{\ensuremath{\Lambda}}}_{c}^{+}\ensuremath{\rightarrow}p{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+})=(5.54\ifmmode\pm\else\textpm\fi{}0.29\ifmmode\pm\else\textpm\fi{}0.73)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}2}$, and $\mathcal{B}({\mathrm{\ensuremath{\Lambda}}}_{c}^{+}\ensuremath{\rightarrow}\ensuremath{\eta}\mathrm{\ensuremath{\Sigma}}(1385{)}^{+})/\mathcal{B}({\mathrm{\ensuremath{\Lambda}}}_{c}^{+}\ensuremath{\rightarrow}p{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+})=0.192\ifmmode\pm\else\textpm\fi{}0.006\ifmmode\pm\else\textpm\fi{}0.016$. The mass and width of the $\mathrm{\ensuremath{\Lambda}}(1670)$ are also precisely determined to be $1674.3\ifmmode\pm\else\textpm\fi{}0.8\ifmmode\pm\else\textpm\fi{}4.9\text{ }\text{ }\mathrm{MeV}/{c}^{2}$ and $36.1\ifmmode\pm\else\textpm\fi{}2.4\ifmmode\pm\else\textpm\fi{}4.8\text{ }\text{ }\mathrm{MeV}$, respectively, where the uncertainties are statistical and systematic, respectively.

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