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

Abstract

Using a data sample of $772\times 10^6$ BB pairs collected on the ${\rm Y}(4S)$ 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 $M_{{\pi }^{+}{\pi }^{-}}<1.22GeV/c^2$ 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 $M_{{\pi }^{+}{\pi }^0}<1.3GeV/c^2$ 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 $B^{+}\to p\bar{p}{\pi }^{+}{\pi }^0$.

7 pages, 4 figures, submitted to Phys.Rev.D