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The CKM angle is important for testing the unitarity of the CKM matrix and searching for new physics. can be extracted by the interference between b u and b c in the B factory such as LHCb and Belle-II. Determining also needs strong parameter information from the charm factory, such as the BESIII experiment. With quantum-correlated data samples collected at BESIII, the uncertainties from the charm sector can be highly suppressed.
Xiaokang Zhou (Tue,) studied this question.