Evidence for the decay B0→pp¯π0

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Abstract

We report a search for the charmless baryonic decay ${B}^{0}\ensuremath{\rightarrow}p\overline{p}{\ensuremath{\pi}}^{0}$ with a data sample corresponding to an integrated luminosity of $711\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ containing $(772\ifmmode\pm\else\textpm\fi{}10)\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ pairs. The data were collected by the Belle experiment running on the $\mathrm{\ensuremath{\Upsilon}}(4S)$ resonance at the KEKB ${e}^{+}{e}^{\ensuremath{-}}$ collider. We measure a branching fraction $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}p\overline{p}{\ensuremath{\pi}}^{0})=(5.0\ifmmode\pm\else\textpm\fi{}1.8\ifmmode\pm\else\textpm\fi{}0.6)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}7}$, where the first uncertainty is statistical and the second is systematic. The signal has a significance of 3.1 standard deviations and constitutes the first evidence for this decay mode. We also search for the intermediate two-body decays ${B}^{0}\ensuremath{\rightarrow}{\mathrm{\ensuremath{\Delta}}}^{+}\overline{p}$ and ${B}^{0}\ensuremath{\rightarrow}{\overline{\mathrm{\ensuremath{\Delta}}}}^{\ensuremath{-}}p$, and set an upper limit on the branching fraction, $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{\mathrm{\ensuremath{\Delta}}}^{+}\overline{p})+\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{\overline{\mathrm{\ensuremath{\Delta}}}}^{\ensuremath{-}}p)<1.6\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$ at 90% confidence level.

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