J. Behrens

TL;DR: An upper limit of 1.1 eV (90% confidence level) is derived on the absolute mass scale of neutrinos on the Karlsruhe Tritium Neutrino experiment KATRIN, which improves upon previous mass limits from kinematic measurements by almost a factor of 2 and provides model-independent input to cosmological studies of structure formation.

TL;DR: The second measurement campaign of the Karlsruhe Tritium Neutrino (KATRIN) experiment was reported in this paper, where the best fit to the spectral data yields an upper limit of (0.26\pm0.34)-,\mathrm{eV^4/c^4}$ at the 90% confidence level (CL).

TL;DR: The first operation of KATRIN with tritium neutrino was reported in 2018, and stable conditions over a time period of 13 days could be established as discussed by the authors.

TL;DR: In this article, a consistent theoretical description of the electron energy spectrum in the endpoint region, an accurate model of the apparatus response function, and the statistical approaches suited to interpret and analyze tritium data observed with KATRIN with the envisaged precision are presented.

TL;DR: The light sterile neutrino search from the first four-week science run of the KATRIN experiment in 2019 is reported, and new limits supersede the Mainz results and improve the Troitsk bound for m_{4}^{2}<30 eV^{2}.