Abstract
The study of the Cabibbo-favored semileptonic decay is reported using a data sample of annihilations collected at center-of-mass energies ranging from 4.600 GeV to 4.699 GeV with the BESIII detector at the BEPCII collider. The branching fraction of the decay is measured to be , which is the most precise measurement to date. Furthermore, we perform an investigation of the internal dynamics in . We provide the first direct comparisons of the differential decay rate and form factors with those predicted from lattice quantum chromodynamics (LQCD) calculations. Combining the measured branching fraction with a -integrated rate predicted by LQCD, we determine .
- Received 28 July 2022
- Accepted 1 November 2022
DOI:https://doi.org/10.1103/PhysRevLett.129.231803
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