Measurements of the branching fractions ofΛc+→pηandΛc+→pπ0decays at Belle

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Abstract

We report measurements of the branching fractions of singly Cabibbo-suppressed decays ${\mathrm{\ensuremath{\Lambda}}}_{c}^{+}\ensuremath{\rightarrow}p\ensuremath{\eta}$ and ${\mathrm{\ensuremath{\Lambda}}}_{c}^{+}\ensuremath{\rightarrow}p{\ensuremath{\pi}}^{0}$ using the full Belle data sample corresponding to an integrated luminosity of $980.6\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$. The data were collected by the Belle detector at the KEKB ${e}^{+}{e}^{\ensuremath{-}}$ asymmetric energy collider. A clear ${\mathrm{\ensuremath{\Lambda}}}_{c}^{+}$ signal is seen in the invariant mass distribution of $p\ensuremath{\eta}$. The fitted number of signal events of the ${\mathrm{\ensuremath{\Lambda}}}_{c}^{+}\ensuremath{\rightarrow}p\ensuremath{\eta}$ process is $7734\ifmmode\pm\else\textpm\fi{}263$; from this, we measure the ratio of branching fractions $\mathcal{B}({\mathrm{\ensuremath{\Lambda}}}_{c}^{+}\ensuremath{\rightarrow}p\ensuremath{\eta})/\mathcal{B}({\mathrm{\ensuremath{\Lambda}}}_{c}^{+}\ensuremath{\rightarrow}p{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+})=\phantom{\rule{0ex}{0ex}}[2.258\ifmmode\pm\else\textpm\fi{}0.077(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.122(\mathrm{syst})]\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}2}$, from which we infer the branching fraction $\mathcal{B}({\mathrm{\ensuremath{\Lambda}}}_{c}^{+}\ensuremath{\rightarrow}p\ensuremath{\eta})=\phantom{\rule{0ex}{0ex}}[1.42\ifmmode\pm\else\textpm\fi{}0.05(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.11(\mathrm{syst})]\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$. In addition, no significant signal for ${\mathrm{\ensuremath{\Lambda}}}_{c}^{+}\ensuremath{\rightarrow}p{\ensuremath{\pi}}^{0}$ is found, so an upper limit on the branching fraction of $\mathcal{B}({\mathrm{\ensuremath{\Lambda}}}_{c}^{+}\ensuremath{\rightarrow}p{\ensuremath{\pi}}^{0})<8.0\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$ at a 90% credibility level is set, more than 3 times better than the best current upper limit.

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