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# The 28th International Workshop on Weak Interactions and Neutrinos (WIN2021)

Jun 7 – 12, 2021
US/Central timezone

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

Not scheduled
20m
Asynchronous 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.

### Primary authors

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

### Presentation materials

 poster-win2021-felkl.pdf talk-win2021-felkl.pdf The Singly-Charged Scalar Singlet as the Origin of Neutrino Masses | Tobias Felkl | WIN 2021