Physical renormalization condition for the quark-mixing matrix

Details Physical renormalization condition for the quark-mixing matrix Physical renormalization condition for the quark-mixing matrix

2004-02-12

arxiv.org/abs/hep-ph/0402130v2

Phys.Rev.D70:033002,2004

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages, LaTeX, minor changes, references added

Scientific paper

10.1103/PhysRevD.70.033002

We investigate the renormalization of the quark-mixing matrix in the Electroweak Standard Model. We show that the corresponding counterterms must be gauge independent as a consequence of extended BRS invariance. Using rigid SU(2)_L symmetry, we proof that the ultraviolet-divergent parts of the invariant counterterms are related to the field renormalization constants of the quark fields. We point out that for a general class of renormalization schemes rigid SU(2)_L symmetry cannot be preserved in its classical form, but is renormalized by finite counterterms. Finally, we discuss a genuine physical renormalization condition for the quark-mixing matrix that is gauge independent and does not destroy the symmetry between quark generations.

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