Abstract
A new upper limit of on the branching ratio of the decay has been obtained using the Crystal Ball multiphoton spectrometer at the Mainz Microtron MAMI. This decay is forbidden by charge-conjugation invariance of the strong and electromagnetic interactions. We have also obtained the upper limit of for the forbidden decay and the upper limit of for .
- Received 9 December 2008
DOI:https://doi.org/10.1103/PhysRevC.79.065201
©2009 American Physical Society