Abstract
Direct violation in the process is a sensitive probe of physics beyond the standard model. We report a measurement of the asymmetry in , where the hadronic recoil system is reconstructed using a pseudoreconstruction technique. In this approach there is negligible contamination from decays, which are expected to have a much larger asymmetry. We find for events having recoil mass smaller than . The analysis is based on a data sample of recorded at the resonance with the Belle detector at the KEKB storage ring.
- Received 4 April 2004
DOI:https://doi.org/10.1103/PhysRevLett.93.031803
©2004 American Physical Society