Universal Evolution of CKM Matrix Elements

Details Universal Evolution of CKM Matrix Elements Universal Evolution of CKM Matrix Elements

1992-10-23

arxiv.org/abs/hep-ph/9210260v2

Phys.Rev.D47:2038-2045,1993

Physics

High Energy Physics

High Energy Physics - Phenomenology

17 pages + 2 figures not included (available upon request), revised version fixes discrepancy between S and S^{1/2}, no other

Scientific paper

10.1103/PhysRevD.47.2038

We derive the two-loop evolution equations for the Cabibbo-Kobayashi-Maskawa matrix. We show that to leading order in the mass and CKM hierarchies the scaling of the mixings $|V_{ub}|^2$, $|V_{cb}|^2$, $|V_{td}|^2$, $|V_{ts}|^2$ and of the rephase-invariant CP-violating parameter $J$ is universal to all orders in perturbation theory. In leading order the other CKM elements do not scale. Imposing the constraint $\lambda _b=\lambda _{\tau}$ at the GUT scale determines the CKM scaling factor to be $\simeq 0.58$ in the MSSM.

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