Abstract
Using a sample of -meson decays collected with the CLEO detector at the Cornell Electron Storage Ring, we have studied and decays, where can be either or . We distinguish from other semileptonic decays by examining the net momentum and energy of the particles recoiling against pairs. We find and derive branching fractions for and of and , respectively, where the uncertainties are statistical and systematic. We also investigate the form factor and the implication of the result for .
- Received 25 November 1998
DOI:https://doi.org/10.1103/PhysRevLett.82.3746
©1999 American Physical Society