Measurement of the branching fraction of Λc+→pω decay at Belle

Le résumé fourni par la source

Using $980.6\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of data collected with the Belle detector operating at the KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider, we present a measurement of the branching fraction of the singly Cabibbo-suppressed decay ${\mathrm{\ensuremath{\Lambda}}}_{c}^{+}\ensuremath{\rightarrow}p\ensuremath{\omega}$. A clear ${\mathrm{\ensuremath{\Lambda}}}_{c}^{+}$ signal is observed for ${\mathrm{\ensuremath{\Lambda}}}_{c}^{+}\ensuremath{\rightarrow}p\ensuremath{\omega}$ with a statistical significance of 9.1 standard deviations, and we measure the ratio of branching fractions $\mathcal{B}({\mathrm{\ensuremath{\Lambda}}}_{c}^{+}\ensuremath{\rightarrow}p\ensuremath{\omega})/\mathcal{B}({\mathrm{\ensuremath{\Lambda}}}_{c}^{+}\ensuremath{\rightarrow}p{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+})=\phantom{\rule{0ex}{0ex}}(1.32\ifmmode\pm\else\textpm\fi{}0.12(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.10(\mathrm{syst}))\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}2}$, from which we infer the branching fraction $\mathcal{B}({\mathrm{\ensuremath{\Lambda}}}_{c}^{+}\ensuremath{\rightarrow}p\ensuremath{\omega})=\phantom{\rule{0ex}{0ex}}(8.27\ifmmode\pm\else\textpm\fi{}0.75(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.62(\mathrm{syst})\ifmmode\pm\else\textpm\fi{}0.42(\mathrm{ref}))\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$. The first quoted uncertainty is statistical, the second systematic, and the third from the reference mode ${\mathrm{\ensuremath{\Lambda}}}_{c}^{+}\ensuremath{\rightarrow}p{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}$.

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