Study of $B \to p {\bar p} \pi \pi$

TL;DR

This study reports the first observations of specific four-body baryonic B meson decays, measuring their branching fractions and analyzing mass distributions using a large data sample from the Belle detector.

Contribution

First observation and measurement of branching fractions for $B^0 o p{ar p} ho angle$ and $B^+ o p{ar p} ho^+$ decays with detailed mass distribution analysis.

Findings

Branching fraction for $B^0 o p{ar p} ho$ is approximately 0.83×10^-6.

Branching fraction for $B^+ o p{ar p} ho^+$ is approximately 4.58×10^-6.

Significance levels exceed 5 standard deviations for both decay modes.

Abstract

Using a data sample of $772 \times 10^6$ BB pairs collected on the ${\Upsilon}(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider, we report the observations of $B^0\to p{\bar p}\pi^+\pi^-$ and $B^+ \to p{\bar p}\pi^+\pi^0$. We measure a decay branching fraction of $(0.83 \pm 0.17 \pm 0.17) \times 10^-6$ in $B^0\to p{\bar p}\pi^+\pi^-$ for $M_{\pi^+\pi^-} < 1.22 GeV/c^2$ with a significance of 5.5 standard deviations. The contribution from $B0 \to p{\bar p}K^0$ is excluded. We measure a decay branching fraction of $(4.58 \pm 1.17 \pm 0.67) \times 10^-6$ for $B^+ \to p{\bar p}\pi^+\pi^0$ with $M_{\pi^+\pi^0} < 1.3 GeV/c^2$ with a significance of 5.4 standard deviations. We study the difference of the $M_{p{\bar p}}$ distributions in $B^0\to p{\bar p}\pi^+\pi^-$ and $B^+ \to p{\bar p}\pi^+\pi^0$.