First neutrino mass measurement with the KATRIN experiment

Lisa Schlüter , Thierry Lasserre (1, 2)

1 APC (UMR_7164) - AstroParticule et Cosmologie
2 DPhP - Département de Physique des Particules (ex SPP)

The KATRIN (Karlsruhe Tritium Neutrino) experiment is designed to determine the effective mass of the electron anti-neutrino with an unprecedented sensitivity of 0.2 eV/c2 (90% C.L.) in a direct and model-independent way. Tritium β-decay electrons, emitted in a high-luminosity molecular source, are analyzed with a MAC-E filter. The effective electron anti-neutrino mass squared is inferred from a fit to the integral spectrum in an energy window close the tritium endpoint. In this work, we report on the analysis of the first four-week science run of KATRIN in spring 2019. Considering statistical and systematic uncertainties, we find a central value of the effective electron anti-neutrino mass of . Following the method of Lokhov and Tkachov, we derive an upper limit of 1.1 eV at 90% C.L. on the absolute neutrino mass scale.

Mots clés: talk: Toyama 2019/09/09; antineutrino/e: mass; neutrino: mass: upper limit; mass: scale; tritium: semileptonic decay; KATRIN; sensitivity; statistical; data analysis method; experimental results

Domaines: Physique des Hautes Energies - Expérience [hep-ex]

Lisa Schlüter, Thierry Lasserre. First neutrino mass measurement with the KATRIN experiment. 16th International Conference on Topics in Astroparticle and Underground Physics, Sep 2019, Toyama, Japan. pp.012180, ⟨10.1088/1742-6596/1468/1/012180⟩. ⟨hal-02564639⟩