Rephasing Invariance and Hierarchy of the CKM Matrix
T. K. Kuo, Lu-Xin Liu · arXiv (Cornell University) · 2005
We identified a set of four rephasing invariant parameters of the CKM matrix. They are found to exhibit hierarchies in powers of $λ^2$, from $λ^2$ to $λ^8$. It is shown that, at the present level of accuracy, only the first three parameters are needed to fit all available data on flavor physics.