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2011

FCNC Effects in a Minimal Theory of Fermion Masses

Buras, Andrzej J., Grojean, Christophe, Pokorski, Stefan et al.

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As a minimal theory of fermion masses we extend the SM by heavy vectorlike fermions, with flavor-anarchical Yukawa couplings, that mix with chiral fermions such that small SM Yukawa couplings arise from small mixing angles.

This model can be regarded as an effective description of the fermionic sector of a large class of existing flavor models and thus might serve as a useful reference frame for a further understanding of flavor hierarchies in the SM.
Already such a minimal framework gives rise to FCNC effects through exchange of massive SM bosons whose couplings to the light fermions get modified by the mixing.
We derive general formulae for these corrections and discuss the bounds on the heavy fermion masses.

FCNC Effects in a Minimal Theory of Fermion Masses · Around

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