Study ofB+→pΛ¯γ,pΛ¯π0andB0→pΛ¯π−
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Abstract
We study the following charmless baryonic three-body decays of $B$ mesons: ${B}^{+}\ensuremath{\rightarrow}p\overline{\ensuremath{\Lambda}}\ensuremath{\gamma}$, ${B}^{+}\ensuremath{\rightarrow}p\overline{\ensuremath{\Lambda}}{\ensuremath{\pi}}^{0}$, and ${B}^{0}\ensuremath{\rightarrow}p\overline{\ensuremath{\Lambda}}{\ensuremath{\pi}}^{\ensuremath{-}}$. The partial branching fractions as a function of the baryon-antibaryon mass and the polar angle distributions of the proton in the baryon-antibaryon system are presented. This study includes the first observation of ${B}^{+}\ensuremath{\rightarrow}p\overline{\ensuremath{\Lambda}}{\ensuremath{\pi}}^{0}$, which is measured to have a branching fraction of $({3.00}_{\ensuremath{-}0.53}^{+0.61}\ifmmode\pm\else\textpm\fi{}0.33)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$. We also set upper limits on branching fractions of the two-body decays ${B}^{0}\ensuremath{\rightarrow}p{\overline{\ensuremath{\Sigma}}}^{*\ensuremath{-}}$, ${B}^{0}\ensuremath{\rightarrow}{\ensuremath{\Delta}}^{0}\overline{\ensuremath{\Lambda}}$, ${B}^{+}\ensuremath{\rightarrow}p{\overline{\ensuremath{\Sigma}}}^{*0}$, and ${B}^{+}\ensuremath{\rightarrow}{\ensuremath{\Delta}}^{+}\overline{\ensuremath{\Lambda}}$ at the 90% confidence level. These results are obtained from a $414\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ data sample collected near the $\ensuremath{\Upsilon}(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider.