Abstract
The study of the Cabibbo-favored semileptonic decay is reported using of annihilation data collected at center-of-mass energies ranging from 4.600 to 4.699 GeV. The branching fraction of the decay is measured to be , 3 times more precise than the prior world average result. Tests of lepton flavor universality using (, ) decays are reported for the first time, based on measurements of the differential decay rates and the forward-backward asymmetries in separate four-momentum transfer regions. The results are compatible with Standard Model predictions. Furthermore, we improve the determination of the form-factor parameters in decays, which provide stringent tests and calibration for lattice quantum chromodynamics calculations.
- Received 5 June 2023
- Accepted 17 July 2023
DOI:https://doi.org/10.1103/PhysRevD.108.L031105
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