Abstract
We report a measurement of the branching fraction based on 2.92 of data accumulated at GeV with the BESIII detector at the BEPCII collider. This measurement, in conjunction with the Cabibbo-Kobayashi-Maskawa matrix element determined from a global Standard Model fit, implies a value for the weak decay constant MeV. Additionally, using this branching fraction measurement together with a Lattice QCD prediction for , we find . In either case, these are the most precise results for these quantities to date.
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