Séminaires du DPhP: Probing sub-eV neutrino mass and light sterile neutrinos with the KATRIN experiment

par Chloé Goupy (CEA)

mardi 16 sept. 2025, 13:30 → 15:00 Europe/Paris

CEA Paris-Saclay

The absolute mass scale of the neutrino remains one of the key open questions in particle physics and cosmology. The Karlsruhe Tritium Neutrino (KATRIN) experiment addresses this challenge by precisely measuring the energy spectrum of electrons from tritium beta decay near its endpoint. KATRIN combines a high-intensity gaseous molecular tritium source with a high-resolution electrostatic spectrometer with magnetic adiabatic collimation. This approach has enabled KATRIN to reach sub-eV sensitivity and set a world-leading upper limit of 0.45 eV/c² (90% confidence level) on the effective electron anti-neutrino mass, based on data from the first five measurement campaigns. These results reflect major advancements in background suppression, control of systematic uncertainties, and statistical precision.
In this talk, I will present the latest results from KATRIN, including the neutrino mass analysis as well as recent results on probing the eV-scale sterile neutrinos parameter space using the same experimental data.

zoom connection: https://cern.zoom.us/j/68399739111?pwd=SGErcHBQYmVLWFZTVE9jdm5xSmdEdz09