Study of decays

We report on a study of decays using 29.1 fb−1 of e+e− annihilation data recorded at the ϒ(4S) resonance with the Belle detector at the KEKB storage ring. Making no assumptions about the intermediate mechanism, the branching fractions for and are determined to be (8.0±0.6±1.5)×10−4 and (6.2±1.2±1.8)×10−4, respectively. An analysis of candidates yields to the first observation of the color-suppressed hadronic decay with the branching fraction (2.9±1.0±0.4)×10−4. We measure the ratio of branching fractions .