# Evidence for the decay $B^0\to p\bar{p}\pi^0$

## TL;DR

This paper provides the first evidence for the rare decay $B^0 o par{p}\pi^0$ with a measured branching fraction, using data from the Belle experiment, and sets limits on related intermediate decay modes.

## Contribution

First evidence for the charmless baryonic decay $B^0 o par{p}\pi^0$ with a measured branching fraction and upper limits on related two-body decays.

## Key findings

- Branching fraction $ imes 10^{-7}$: $5.0\pm1.8 ext{(stat)}\pm0.6 ext{(syst)}$
- Significance of 3.1 standard deviations
- Upper limit on $B^0 o \Delta^+ar{p}$ and $B^0 o ar{\Delta}^-p$ decays: $1.6 imes10^{-6}$

## Abstract

We report a search for the charmless baryonic decay $B^0\to p\bar{p}\pi^0$ with a data sample corresponding to an integrated luminosity of 711~$\rm fb^{-1}$ containing $(772\pm 10)\times 10^6$ $B^0\bar{B}^0$ pairs. The data was collected by the Belle experiment running on the $\Upsilon(4S)$ resonance at the KEKB $e^+e^-$ collider. We measure a branching fraction $\mathcal{B}(B^0\to p\bar{p}\pi^0)= (5.0\pm1.8\pm0.6 )\times 10^{-7}$, 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 $B^{0}\to\Delta^+\bar{p}$ and $B^0\to\bar{\Delta}^-p$, and set an upper limit on the branching fraction: $\mathcal{B}(B^0\to \Delta^+\bar{p})+\mathcal{B}(B^0\to\bar{\Delta}^-p)<1.6\times10^{-6}$ at 90% confidence level.