Abstract
We have obtained about 4000 events above background which satisfy the two-constraint fit with the hypothesis . Their Dalitz-plot population shows the existence of direct radiation in addition to that of the expected inner bremsstrahlung. The best fit to the sum of and decays in the charged-pion kinetic energy interval of 55 to 90 MeV gives a branching ratio for direct emission of (1.56 ± 0.35) × , with a systematic uncertainty of ± 0.5 × . No interference is required for a good fit.
- Received 3 August 1972
DOI:https://doi.org/10.1103/PhysRevLett.29.1118
©1972 American Physical Society