Fermion flavor mixing in models with dynamical mass generation

0343075 - ÚJF 2011 RIV US eng J - Journal Article
Beneš, Petr
Fermion flavor mixing in models with dynamical mass generation.
Physical Review D: Particles, Fields, Gravitation and Cosmology. Roč. 81, č. 6 (2010), 065029/1-065029/13. ISSN 1550-7998
Institutional research plan: CEZ:AV0Z10480505
Keywords : weak interactions * particle physics * neutrino masses
Subject RIV: BE - Theoretical Physics
Impact factor: 4.964, year: 2010

We present a model-independent method of dealing with fermion flavor mixing in the case when instead of constant, momentum-independent mass matrices one has rather momentum-dependent self-energies. This situation is typical for strongly coupled models of dynamical fermion mass generation. We demonstrate our approach on the example of quark mixing. We show that quark self-energies with a generic momentum dependence lead to an effective Cabibbo-Kobayashi-Maskawa matrix, which turns out to be in general nonunitary, in accordance with previous claims of other authors, and to nontrivial flavor changing electromagnetic and neutral currents. We also discuss some conceptual consequences of the momentum-dependent self-energies and show that in such a case the interaction basis and the mass basis are not related by a unitary transformation. In fact, we argue that the latter is merely an effective concept, in a specified sense.
Permanent Link: http://hdl.handle.net/11104/0185637