Probing neutrino physics beyond the Standard Model with KATRIN and Ricochet

The discovery of neutrino oscillations has proven that neutrinos have mass, and yet, for all the experimental efforts to constrain it, the neutrino mass scale remains undetermined. 

The KATRIN experiment aims at measuring the effective electron antineutrino mass mν with a 0.2 eV (90%C.L.) sensitivity by analysing the β-decay spectrum of molecular tritium near its endpoint. This 70 m-long experiment consists of a windowless gaseous source, differential and cryogenic pumps for tritium retention, and a main spectrometer acting as a high-pass filter for the electrons collimated towards the 148-pixel silicon detector.

If a direct measurement of mν would constrain Standard Model extensions, a precise observation of coherent neutrino scattering would provide a novel probe for studying interactions beyond the Standard Model. To this end, the Ricochet experiment aims at placing a combination of Germanium and Zinc bolomoters close to a nuclear reactor and leverage particle identification.

This talk will focus on the commissioning of the KATRIN experiment, with an emphasis on the analysis of its first tritium runs. Additionally, background simulations and sensitivity studies for Ricochet will be presented.