期刊
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
卷 54, 期 6, 页码 1131-1136出版社
SCIENCE PRESS
DOI: 10.1007/s11433-011-4320-2
关键词
superallowed Fermi transition; random phase approximation; relativistic point-coupling energy functional; Cabibbo-Kobayashi-Maskawa matrix
资金
- National Natural Science Foundation of China [10947013]
- Fundamental Research Funds for the Central Universities [XDJK2010B007]
- SWU Initial Research Foundation [SWU109011]
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 delta (c) for the 0(+) -> 0(+) superallowed Fermi transitions. With these delta (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.
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