Abstract
The singly Cabibbo-suppressed decay is observed for the first time with a statistical significance of by using of collision data collected at center-of-mass energies between 4.600 and 4.699 GeV with the BESIII detector at BEPCII. The absolute branching fraction of is measured to be in a model-independent approach. This is the first observation of a Cabibbo-suppressed decay involving in the final state. The ratio of branching fractions between and the Cabibbo-favored decay is observed to be , where with the Cabibbo mixing angle.
- Received 12 September 2023
- Revised 6 November 2023
- Accepted 2 April 2024
DOI:https://doi.org/10.1103/PhysRevD.109.L071103
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Published by the American Physical Society