R. Sack

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: 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}.

TL;DR: Aker et al. as mentioned in this paper set an upper bound of 1.1 eV on the neutrino-mass scale at a 90% confidence level, based on a few weeks of running at a reduced source intensity and dominated by statistical uncertainty.