# DISCRETE 2018

26-30 November 2018
Europe/Vienna timezone

## Froggatt-Nielsen mechanism in a model with 331-gauge group

27 Nov 2018, 15:10
25m
Johannessaal

#### Johannessaal

Austrian Academy of Sciences, Dr.-Ignaz-Seipel-Platz 2, 1010 Vienna, AUSTRIA
Non-Invited Talk [5] Discrete symmetries and models of flavour mixing

### Speaker

Mr Niko Koivunen (University of Helsinki)

### Description

The models with the gauge group $SU(3)_c\times SU(3)_L\times U(1)_X$ (331-models) have been advocated to explain why there are three fermion generations in Nature. As such they provide partial understanding of the flavour sector. The hierarchy of fermion masses in the Standard Model is another puzzle which remains without compelling explanation. In this talk I present a model that incorporates Froggatt-Nielsen mechanism into a 331-model in order to explain both fundamental problems. It turns out that no new additional scalar representations are needed to take care of this. The 331-models thus naturally include explanations to both the number of fermion generations and their mass hierarchy. This talk is based on arXiv:1706.09463[hep-ph].

Content of the contribution Theory

### Primary author

Mr Niko Koivunen (University of Helsinki)

### Co-author

Prof. Katri Huitu (University of Helsinki)