Abstract
Using of collision data collected at a center-of-mass energy of with the BESIII detector, we measure the branching fractions of the decays and . By constraining the ratio of decay rates of to and to to the Standard Model prediction, the branching fractions are determined to be and . Using these branching fractions, we obtain a value for the decay constant of , where the first error is statistical and the second systematic.
- Received 24 August 2016
DOI:https://doi.org/10.1103/PhysRevD.94.072004
© 2016 American Physical Society