3-6 March 2020
Faculty of Science, University of Toyama
Asia/Tokyo timezone

Low-scale flavon model with a Z_N symmetry

6 Mar 2020, 09:40
40m
A238 (Faculty of Science, University of Toyama)

A238

Faculty of Science, University of Toyama

3190 Gofuku, Toyama 930-8555, Japan
Oral

Speaker

Tetsutaro Higaki (Keio University)

Description

We propose a model that explains the fermion mass hierarchy by the Froggatt-Nielsen mechanism with a discrete Z_N flavor symmetry. As a concrete model, we study a supersymmetric model with a single flavon coupled to the minimal supersymmetric Standard Model. Flavon develops a TeV scale vacuum expectation value for realizing flavor hierarchy, an appropriate µ-term and the electroweak scale, hence the model has a low cutoff scale. We demonstrate how the flavon is successfully stabilized together with the Higgs bosons in the model. The discrete flavor symmetry Z_N controls not only the Standard Model fermion masses, but also the Higgs potential and a mass of the Higgsino which is a good candidate for dark matter. The hierarchy in the Higgs-flavon sector is determined in order to make the model anomaly-free and realize a stable electroweak vacuum. We show that this model can explain the fermion mass hierarchy, realistic Higgs-flavon potential and thermally produced dark matter at the same time. We discuss flavor violating processes induced by the light flavon which would be detected in future experiments.

Primary author

Tetsutaro Higaki (Keio University)

Co-author

Junichiro Kawamura

Presentation Materials