Abstract
We report the first measurement of the forward-backward asymmetry and the ratios of Wilson coefficients and in , where represents an electron or a muon. We find evidence for the forward-backward asymmetry with a significance of . The results are obtained from a data sample containing pairs that were collected on the resonance with the Belle detector at the KEKB asymmetric-energy collider.
- Received 8 March 2006
DOI:https://doi.org/10.1103/PhysRevLett.96.251801
©2006 American Physical Society