Abstract
We report measurements of the branching fraction and violation parameters in decays. The results are based on a data sample that contains pairs collected at the resonance, with the Belle detector at the KEKB asymmetric-energy collider. We obtain for the branching fraction of . The measured values of the violation parameters are , , where the first error is statistical and the second is systematic. We find evidence of violation in at the confidence level. While the value of is consistent with expectations from other measurements, the value of the parameter favors large direct violation at the confidence level, in contradiction to standard model expectations.
- Received 19 February 2007
DOI:https://doi.org/10.1103/PhysRevLett.98.221802
©2007 American Physical Society