Abstract
This Letter is the first report of the decay. Based on events, we determine the branching fraction, , and . This ratio agrees with a theoretical prediction based on chiral perturbation theory (ChPT) calculated to . The measured kinematical distributions agree with those predicted by just ChPT , but show significant disagreement with ones predicted by leading-order ChPT.
- Received 22 May 2007
DOI:https://doi.org/10.1103/PhysRevLett.99.081803
©2007 American Physical Society