Abstract
We present a measurement of , the branching fraction ratio , for both charged and neutral mesons. The ratio for the charged case is the first measurement ever performed. In addition, we report absolute branching fractions for the individual modes in bins of the squared dilepton invariant mass . The analysis is based on a data sample of , containing events, recorded at the resonance with the Belle detector at the KEKB asymmetric-energy collider. The obtained results are consistent with standard model expectations.
- Received 29 September 2020
- Revised 3 March 2021
- Accepted 17 March 2021
DOI:https://doi.org/10.1103/PhysRevLett.126.161801
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
Published by the American Physical Society