Volume 485 - The European Physical Society Conference on High Energy Physics (EPS-HEP2025) - T03 Neutrino Physics
Direct neutrino mass measurement at the KATRIN experiment
J. Štorek
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Abstract
The KArlsruhe TRItium Neutrino experiment (KATRIN) is performing a high precision spectroscopy of the tritium beta-decay spectrum to search for the signature of the neutrino mass. It combines a high-intensity gaseous molecular tritium source and a high-resolution electrostatic spectrometer with magnetic adiabatic collimation. This allows KATRIN to reach a sub-eV sensitivity to the neutrino mass. Moreover, existence of the fourth neutrino-mass eigenstate (sterile neutrino), a new light boson and exotic general weak interactions are investigated.

The analysis of the first five KATRIN measurement campaigns results in a new neutrino-mass upper limit $m_\nu<0.45 \, \text{eV}$ at 90% confidence level (CL) and the existence of a sterile neutrino is excluded in the studied region with 95% CL. In the analysis of the second measurement campaign we derive competitive constrains on general neutrino interactions and evaluate the campaign's sensitivity to the existence of the new light bosons.
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