Abstract
We report measurements of the branching fractions and direct asymmetries () for , and decays (but not ) based on the final data sample of pairs collected at the resonance with the Belle detector at the KEKB asymmetric-energy collider. We set a 90% confidence-level upper limit for at ; all other decays are observed with branching fractions ranging from to . In the mode, we confirm Belle’s previously reported large with a value of and a significance of . For all other flavor-specific modes, we find values consistent with zero, including with significance. The difference of asymmetry between and is found to be with significance. We also calculate the ratios of partial widths for the decays. Using our results, we test the validity of the sum rule and obtain a sum of with significance.
- Received 4 October 2012
DOI:https://doi.org/10.1103/PhysRevD.87.031103
© 2013 American Physical Society