Abstract
We report measurements of branching fractions of lepton decays to final states with a meson using a data sample accumulated with the Belle detector at the KEKB asymmetric-energy collider. The inclusive branching fraction is measured to be , where can be anything; the exclusive branching fractions are , , , , , , where the first uncertainty is statistical and the second is systematic. For each mode, the accuracy is improved over that of pre--factory measurements by a factor ranging from five to ten. In decays, clear signals for the intermediate states and are observed.
1 More- Received 21 February 2014
DOI:https://doi.org/10.1103/PhysRevD.89.072009
© 2014 American Physical Society