From Flavour to SUSY Flavour Models

TL;DR

This paper explores how supersymmetry (SUSY) models can explain both fermion and scalar superpartner flavor structures, emphasizing the importance of SUSY-specific effects and predicting sparticle spectra within an SU(5) GUT framework.

Contribution

It introduces a comprehensive approach to SUSY flavor models, highlighting the role of SUSY effects like threshold corrections and canonical normalization in linking flavor structures to SUSY parameters.

Findings

SUSY effects significantly influence fermion mass and mixing fits.

The 'Trilinear Dominance' scheme predicts specific flavor violation patterns.

Analysis within an SU(5) GUT framework demonstrates the model's predictive power.

Abstract

If supersymmetry (SUSY) will be discovered, successful models of flavour not only have to provide an explanation of the flavour structure of the Standard Model fermions, but also of the flavour structure of their scalar superpartners. We discuss aspects of such "SUSY flavour" models, towards predicting both flavour structures, in the context of supergravity (SUGRA). We point out the importance of carefully taking into account SUSY-specific effects, such as 1-loop SUSY threshold corrections and canonical normalization, when fitting the model to the data for fermion masses and mixings. This entangles the flavour model with the SUSY parameters and leads to interesting predictions for the sparticle spectrum. We demonstrate these effects by analyzing an example class of flavour models in the framework of an SU(5) Grand Unified Theory with a family symmetry with real triplet representations. For flavour violation through the SUSY soft breaking terms, the class of models realizes a scheme we refer to as "Trilinear Dominance", where flavour violation effects are dominantly induced by the trilinear terms.