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Report number	arXiv:1105.3725 ; CERN-PH-TH-2011-117 ; FLAVOUR(267104)-ERC-1 ; TUM-HEP-807-11 ; CERN-PH-TH-2011-117 ; FLAVOUR(267104)-ERC-1 ; TUM-HEP-807-11
Title	FCNC Effects in a Minimal Theory of Fermion Masses
Author(s)	Buras, Andrzej J. (Munich, Tech. U. ; TUM-IAS, Munich) ; Grojean, Christophe (CERN ; Saclay, SPhT) ; Pokorski, Stefan (TUM-IAS, Munich ; CERN ; Warsaw U.) ; Ziegler, Robert (Munich, Tech. U. ; TUM-IAS, Munich)
Publication	2011
Imprint	19 May 2011
Number of pages	19
Note	Comments: 19 pages, 1 figure 19 pages, 1 figure
In:	JHEP 08 (2011) 028
DOI	10.1007/JHEP08(2011)028
Subject category	Particle Physics - Phenomenology
Abstract	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. Particularly stringent bounds, in a few TeV range, come from the corrections to the Z couplings.
Copyright/License	Preprint: © 2011-2025 CERN (License: CC-BY-3.0)

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