# ICHEP 2020

28 July 2020 to 6 August 2020
virtual conference
Europe/Prague timezone

## Implications of Rare Kaon Decays on Lepton Number Violating Interactions

31 Jul 2020, 12:00
15m
virtual conference

#### virtual conference

Talk 02. Neutrino Physics

### Speaker

Kåre Fridell (Technical University of Munich)

### Description

We investigate the possibility of lepton number violation (LNV) manifesting in the rare kaon decay $K\to\pi\nu\nu$, its consequences for radiative neutrino mass generation and the washout of lepton asymmetry in high-scale leptogenesis scenarios. We perform the analysis in a model-independent framework, the Standard model effective field theory (SMEFT), and connect it to a possible minimal UV completion featuring leptoquarks. Possibilities to detect the LNV nature of the rare kaon decay are discussed in the context of the currently operating NA62 experiment at CERN and the KOTO experiment at J-PARC. We find that LNV could be detectable, and that any such detection would put high-scale leptogenesis under tension but could account for small radiatively generated neutrino masses.

 Secondary track (number) 05

### Primary author

Kåre Fridell (Technical University of Munich)

### Co-authors

Prof. Frank Deppisch (University College London) Dr Julia Harz (Technical University of Munich)