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# EPS-HEP2021 conference

Jul 26 – 30, 2021
Zoom
Europe/Berlin timezone

## The Singly-Charged Scalar Singlet as the Origin of Neutrino Masses

Jul 26, 2021, 10:00 AM
20m
Zoom

#### Zoom

Parallel session talk Neutrino Physics

### Speaker

Tobias Felkl (University of New South Wales)

### Description

We consider the generation of neutrino masses via a singly-charged scalar singlet. Under general assumptions we identify two distinct structures for the neutrino mass matrix. This yields a constraint for the antisymmetric Yukawa coupling of the singly-charged scalar singlet to two left-handed lepton doublets, irrespective of how the breaking of lepton-number conservation is achieved. The constraint disfavours large hierarchies among the Yukawa couplings. We study the implications for the phenomenology of lepton-flavour universality, measurements of the $W$-boson mass, flavour violation in the charged-lepton sector and decays of the singly-charged scalar singlet. We also discuss the parameter space that can address the Cabibbo Angle Anomaly.

First author Tobias Felkl t.felkl@unsw.edu.au PhD Research Project

### Primary authors

Tobias Felkl (University of New South Wales) Michael Schmidt (UNSW Sydney) Juan Herrero-Garcia (IFIC)