TL;DR
This paper explores extensions of Minimal Flavor Violation in strongly coupled electroweak symmetry breaking theories, proposing a framework where the top quark is treated differently to satisfy experimental bounds.
Contribution
It introduces a novel extension of MFV allowing differential treatment of the top quark using an U(2) symmetry in the strong sector.
Findings
Light quark chiralities can be mostly elementary
The U(2) symmetry framework satisfies experimental bounds
Extended MFV framework accommodates top quark differences
Abstract
We revisit and extend realizations of Minimal Flavor Violation (MFV) in theories with strongly coupled electro-weak symmetry breaking. MFV requires that some chiralities of light SM quarks are strongly composite leading, depending on the scenario, to bounds from compositeness searches, precision electro-weak tests or even flavor physics. Within the framework of partial compositeness we show how to extend the MFV paradigm allowing the treat the top quark differently. This can be realized if for example the strong sector has an U(2) symmetry. In this case the light generations can be mostly elementary and all the bounds are easily satisfied.
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