Abstract
Using data from CLEO II at the Cornell Electron Storage Ring we provide a new measurement of the branching fraction for →, and we present the first measurements of → and of →, which is due to an isospin changing ΔI=3/2 transition. From these data we extract the ratio of isospin amplitudes ‖/‖, and the cosine of the relative phase δ=- between these amplitudes, for D→ππ decays. Unlike the situation in kaon decay where is strongly suppressed, we find ‖/‖=0.72±0.13±0.11 and cosδ=0.14±0.13±0.09.
- Received 11 June 1993
DOI:https://doi.org/10.1103/PhysRevLett.71.1973
©1993 American Physical Society