# Latest results from KATRIN: neutrino mass and beyond

- Institution: CERN
- Department: EP Seminar
- Speaker: Kathrin Valerius
- Year: 2025
- Language: English
- Source: [CERN](https://videos.cern.ch/record/3023147)
- Licence: [CERN](http://copyright.web.cern.ch)
- Who can watch: Teens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

The Karlsruhe Tritium Neutrino experiment (KATRIN) probes the absolute neutrino mass scale with sub-electronvolt sensitivity by precisely measuring the endpoint region of the tritium beta-decay spectrum. KATRIN combines a high-intensity gaseous tritium source and a high-resolution electrostatic spectrometer with magnetic collimation. This talk presents the latest results based on the first five science runs, totaling 259 days of data. From this analysis, KATRIN sets a new upper limit on the effective electron neutrino mass of 0.45 eV (90% C.L.), representing the most stringent direct bound to date. We also report updated constraints on light sterile neutrinos in the eV mass range, placing improved bounds on mixing amplitudes relevant to short-baseline anomalies, along with results from other searches for physics beyond the Standard Model. The presentation concludes with an outlook on future prospects in tritium beta spectroscopy.

Refreshments will be served at 10:30 .

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## Lectures

1. [Latest results from KATRIN: neutrino mass and beyond](https://invisiblenetwork.ai/learn/cern/3023147/2c1bf4063cd6), 1 h 6 min (CERN's player)