Study of $\bar{B^{0}} \to D^{(*)0} π^+ π^-$ Decays

Details Study of $\bar{B^{0}} \to D^{(*)0} π^+ π^-$ Decays Study of $\bar{B^{0}} \to D^{(*)0} π^+ π^-$ Decays

2002-11-08

arxiv.org/abs/hep-ex/0211022v2

Phys.Lett.B553:159-166,2003

Physics

High Energy Physics

High Energy Physics - Experiment

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

Scientific paper

10.1016/S0370-2693(02)03198-2

We report on a study of $\bar{B^{0}} \to D^{(*) 0} \pi^+ \pi^-$ decays using 29.1 fb$^{-1}$ of $e^{+}e^{-}$ annihilation data recorded at the $\Upsilon(4S)$ 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 $\bar{B}^0 \to D^{* 0} \pi^+ \pi^-$ 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 $\bar{B^{0}} \to D^{0} \pi^+ \pi^-$ 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 ${\mathcal B}(\bar{B^0} \to D^0 \rho^0) / {\mathcal B}(\bar{B^0} \to D^0 \omega)$ = 1.6 $\pm$ 0.8.

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