Study of $\overline{B^0}\to D^{(\ast )0}{\pi }^{+}{\pi }^{-}$ Decays

Abstract

We report on a study of $\overline{B^0}\to D^{(\ast )0}{\pi }^{+}{\pi }^{-}$ decays using 29.1 fb${}^{-1}$ of $e^{+}{e}^{-}$ annihilation data recorded at the ${\rm Y}(4S)$ resonance with the Belle detector at the KEKB storage ring. Making no assumptions about the intermediate mechanism, the branching fractions for ${\bar{B}}^0\to D^0{\pi }^{+}{\pi }^{-}$ and ${\bar{B}}^0\to D^{\ast 0}{\pi }^{+}{\pi }^{-}$ are determined to be $(8.0\pm 0.6\pm 1.5)\times 10^{-4}$ and $(6.2\pm 1.2\pm 1.8)\times 10^{-4}$ respectively. An analysis of $\overline{B^0}\to D^0{\pi }^{+}{\pi }^{-}$ candidates yields to the first observation of the color-suppressed hadronic decay ${\bar{B}}^0\to D^0{\rho }^0$ with the branching fraction $(2.9\pm 1.0\pm 0.4)\times 10^{-4}$. We measure the ratio of branching fractions $\mathcal{B}(\overline{B^0}\to D^0{\rho }^0)/\mathcal{B}(\overline{B^0}\to D^0\omega )$ = 1.6 $\pm$ 0.8.

13 pages, LaTex, 4 figures, submitted to Phys. Lett. B

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