Observation of ${B}^{+}\ensuremath{\rightarrow}\ensuremath{\psi}(3770){K}^{+}$

Observation of $B^{+} \to ψ (3770) K^{+}$

R. Chistov et al. (Belle Collaboration)

Phys. Rev. Lett. 93, 051803 – Published 29 July 2004

Abstract

We report the first observation of the decay $B^{+} \to ψ (3770) K^{+}$ where the $ψ (3770)$ is reconstructed in the $D^{0} {\bar{D}}^{0}$ and $D^{+} D^{-}$ decay channels. The obtained branching fraction is $B (B^{+} \to ψ (3770) K^{+}) = (0.48 \pm 0.11 \pm 0.07) \times 10^{- 3}$ . We have measured the branching fraction for the decay $B^{+} \to D^{0} {\bar{D}}^{0} K^{+}$ to be $(1.17 \pm 0.21 \pm 0.15) \times 10^{- 3}$ and set a $90 %$ confidence level upper limit of $0.90 \times 10^{- 3}$ for the decay $B^{+} \to D^{+} D^{-} K^{+}$ . We also present the results of a search for possible decays to $D \bar{D}$ and $D^{0} {\bar{D}}^{0} π^{0}$ of the recently observed $X (3872)$ particle. The analysis is based on $88 {f b}^{- 1}$ of data collected at the $Υ (4 S)$ resonance by the Belle detector at the KEKB asymmetric-energy $e^{+} e^{-}$ collider.