Not really new, but the KATRIN experiment's upper bound on the lightest neutrino mass has fallen from 0.8 eV to 0.45 eV, as the collaboration previously noted in conference papers and preprints recounted in a June 20, 2024 post at this blog, and has now published in the scientific journal Science, according to the New York Times.
Ultimately, the experiment should be able to reduce the upper bound on the absolute value of the lightest neutrino mass to 0.2 eV. The true value, based upon other indications like neutrino oscillation data and cosmology based measurements is probably closer to 0.001 eV.
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