The Cabibbo-Kobayashi-Maskawa (CKM) matrix elements |Vcd| and |Vcs| are essential to test the unitary of CKM matrix. Before 2014, many results of |Vcd| and |Vcs| had been reported at BaBar, Belle, and CLEO experiments. The precisions of the most accurate results of |Vcd| and |Vcs| are 4.4% and 3.3%, respectively. After that, benefitting from larger data samples collected at BESIII, the precisions of |Vcd| and |Vcs| are improved to 1.8% and 0.9%, respectively.
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Tengjiao Wang (2024) studied this question.
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