Observation of B0→pΛ¯π−

Le résumé fourni par la source

We report the first observation of the charmless hyperonic $B$ decay, ${B}^{0}\ensuremath{\rightarrow}p\overline{\ensuremath{\Lambda}}{\ensuremath{\pi}}^{\ensuremath{-}}$, using a $78\text{ }\text{ }{\mathrm{f}\mathrm{b}}^{\ensuremath{-}1}$ data sample recorded on the $\ensuremath{\Upsilon}(4S)$ resonance with the Belle detector at KEKB. The measured branching fraction is $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}p\overline{\ensuremath{\Lambda}}{\ensuremath{\pi}}^{\ensuremath{-}})=({3.97}_{\ensuremath{-}0.80}^{+1.00}\ifmmode\pm\else\textpm\fi{}0.56)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$. Searches for ${B}^{0}\ensuremath{\rightarrow}p\overline{\ensuremath{\Lambda}}{K}^{\ensuremath{-}}$ and $p{\overline{\ensuremath{\Sigma}}}^{0}{\ensuremath{\pi}}^{\ensuremath{-}}$ yield no significant signals and we set 90% confidence-level upper limits of $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}p\overline{\ensuremath{\Lambda}}{K}^{\ensuremath{-}})<8.2\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}7}$ and $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}p{\overline{\ensuremath{\Sigma}}}^{0}{\ensuremath{\pi}}^{\ensuremath{-}})<3.8\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.