QCD sum rules determine the axial-vector mixing angle θ_Bc(1P) = (43.3 ± 0.2)° in the B_c(1P) sector.
Modern status of heavy quark sum rules in QCD,
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QCD sum-rule determination of the axial-vector mixing angle in the \texorpdfstring{\(B_c(1P)\)}{Bc(1P)} sector
QCD sum rules determine the axial-vector mixing angle θ_Bc(1P) = (43.3 ± 0.2)° in the B_c(1P) sector.