Abstract
We present a measurement of angular observables and a test of lepton flavor universality in the decay, where is either or . The analysis is performed on a data sample corresponding to an integrated luminosity of containing pairs, collected at the resonance with the Belle detector at the asymmetric-energy collider KEKB. The result is consistent with standard model (SM) expectations, where the largest discrepancy from a SM prediction is observed in the muon modes with a local significance of .
- Received 8 December 2016
DOI:https://doi.org/10.1103/PhysRevLett.118.111801
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