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

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~$\mathrm{f}{\mathrm{b}}^{-1}$ containing $(772\pm 10)\times 10^6$ $B^0{\bar{B}}^0$ pairs. The data was collected by the Belle experiment running on the ${\rm Y}(4S)$ resonance at the KEKB $e^{+}{e}^{-}$ collider. We measure a branching fraction $\mathcal{B}(B^0\to p\bar{p}{\pi }^0)=(5.0\pm 1.8\pm 0.6)\times 10^{-7}$, 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: $\mathcal{B}(B^0\to {\Delta }^{+}\bar{p})+\mathcal{B}(B^0\to {\bar{\Delta }}^{-}p)<1.6\times 10^{-6}$ at 90% confidence level.

8 pages, 3 figures, Submitted to Phys. Rev. D (RC)

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• ppbar enhancement in B and J/Psi decay
• Charmful Three-body Baryonic B decays
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• On the smallness of Tree-dominated Charmless Two-body Baryonic $B$ Decay Rates

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