# ICHEP 2020

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

## Search for heavy neutral lepton production at the NA62 experiment

28 Jul 2020, 20:45
15m
virtual conference

#### virtual conference

Talk 02. Neutrino Physics

### Speaker

Evgueni Goudzovski

### Description

Searches for heavy neutral lepton production in K+ --> e+N and K+ --> mu+N decays using the data set collected by the NA62 experiment at CERN in 2016-18 are presented. Upper limits on the elements of the extended neutrino mixing matrix $|U_{e4}|^2$ and $|U_{\mu4}|^2$ are established at the levels of $10^{-9}$ and $10^{-8}$, respectively, improving on the earlier searches for heavy neutral lepton production and decays in the kinematically accessible mass range.

 Secondary track (number) 03