Observation of a Near-threshold $D^0{\bar{D}}^0{\pi }^0$ Enhancement in $B\to D^0{\bar{D}}^0{\pi }^{0}K$ Decay

Abstract

We report the first observation of a near-threshold enhancement in the $D^0{\bar{D}}^0{\pi }^0$ system from $B\to D^0{\bar{D}}^0{\pi }^{0}K$ decays using a 414 ${\mathrm{fb}}^{-1}$ data sample collected at the ${\rm Y}(4S)$ resonance. The enhancement peaks at a mass $M=3875.4\pm 0.7_{-2.0}^{+1.2}$ MeV/$c^2$ and the branching fraction for events in the peak is \Br ($B\to D^0{\bar{D}}^0{\pi }^{0}K$)=(1.27 $\pm$ 0.31 ${}_{-0.39}^{+0.22})$ $\times$ $10^{-4}$. The data were collected with the Belle detector at the KEKB energy-asymmetric $e^{+}{e}^{-}$ collider.

Comments: 9 pages, 2 figures, KEK Preprint 2006-16, Belle Prerpint 2006-19, submitted to PRL

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