The self-consistent random phase approximation (RPA) approach with the residual interaction derived from a relativistic point-coupling energy functional is applied to evaluate the isospin symmetry-breaking corrections δ c for the 0+ → 0+ superallowed Fermi transitions. With these δ c values, together with the available experimental f t values and the improved radiative corrections, the unitarity of the Cabibbo-Kobayashi-Maskawa (CKM) matrix is examined. Even with the consideration of uncertainty, the sum of squared top-row elements has been shown to deviate from the unitarity condition by 0.1% for all the employed relativistic energy functionals.
- Cabibbo-Kobayashi-Maskawa matrix
- random phase approximation
- relativistic point-coupling energy functional
- superallowed Fermi transition
ASJC Scopus subject areas
- Physics and Astronomy(all)