# EPS-HEP2021 conference

26-30 July 2021
Zoom
Europe/Berlin timezone

## First Sub-eV Neutrino Mass Limit from the KATRIN Experiment

26 Jul 2021, 11:00
20m
Zoom

#### Zoom

Parallel session talk Neutrino Physics

### Speaker

Christian Karl (Max Planck Institute for Physics)

### Description

The KATRIN experiment is designed to measure the effective electron anti-neutrino mass $m_\nu$ with a sensitivity close to 0.2 eV by investigating the energy spectrum of tritium $\beta$-decay. After a brief introduction of the experiment, we will focus on the results from our second data taking phase which took place in autumn 2019. For this period, the source activity was increased by a factor of four with respect to the first campaign and around 4.2 million electrons were collected in the region of interest. A fit to this data including all dominant uncertainties yields $m^2_\nu = 0.26 \pm 0.34$ eV$^2$. This corresponds to an upper limit of $m_\nu < 0.9$ eV (sensitivity $m_\nu < 0.7$ eV) using the method of Lokhov and Tkachov. Finally, we will give a brief outlook on the upcoming measurement phases.

Collaboration / Activity KATRIN

### Primary author

Christian Karl (Max Planck Institute for Physics)

### Co-author

Susanne Mertens (Max Planck Institute for Physics)