Although the mass of the electron antineutrino is still eluding direct measurement, the KATRIN experiment with its huge spectrometer has pushed the sensitivity below a billionth of the proton mass.
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Nucciotti, A. Still too small to be measured. Nat. Phys. 18, 128–129 (2022). https://doi.org/10.1038/s41567-021-01495-7
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DOI: https://doi.org/10.1038/s41567-021-01495-7
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