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The Cabibbo-Kobayashi-Maskawa (CKM) matrix elements |V₂₃| and |V₂ₒ| are essential to test the unitary of CKM matrix. Before 2014, many results of |V₂₃| and |V₂ₒ| had been reported at BaBar, Belle, and CLEO experiments. The precisions of the most accurate results of |V₂₃| and |V₂ₒ| are 4. 4\% and 3. 3\%, respectively. After that, benefitting from larger data samples collected at BESIII, the precisions of |V₂₃| and |V₂ₒ| are improved to 1. 8\% and 0. 9\%, respectively.
Tengjiao Wang (Sun,) studied this question.