articlePhysical Review LettersNov 25, 2019HYBRID OA

Improved Upper Limit on the Neutrino Mass from a Direct Kinematic Method by KATRIN

Karlsruhe Institute of Technology · Commissariat à l'Énergie Atomique et aux Énergies Alternatives · +22 more institutions

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Abstract

We report on the neutrino mass measurement result from the first four-week science run of the Karlsruhe Tritium Neutrino experiment KATRIN in spring 2019. Beta-decay electrons from a high-purity gaseous molecular tritium source are energy analyzed by a high-resolution MAC-E filter. A fit of the integrated electron spectrum over a narrow interval around the kinematic end point at 18.57 keV gives an effective neutrino mass square value of (-1.0_{-1.1}^{+0.9}) eV^{2}. From this, we derive an upper limit of 1.1 eV (90% confidence level) on the absolute mass scale of neutrinos. This value coincides with the KATRIN sensitivity. It improves upon previous mass limits from kinematic measurements by almost a factor of 2…

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