Abstract
We report the measurement of the direct asymmetry in the radiative decay using a data sample of pairs collected at the resonance with the Belle detector at the KEKB asymmetric-energy collider. The asymmetry is measured as a function of the photon energy threshold. For , where is the photon energy in the center-of-mass frame, we obtain , consistent with the standard model prediction.
- Received 7 January 2015
DOI:https://doi.org/10.1103/PhysRevLett.114.151601
© 2015 American Physical Society