An improved upper limit for the (muon based) neutrino mass
Abstract
The width for the mu decay is calculated in the V-A theory leaving open the possibility of non zero neutrino masses. It is shown that not only the agreement with the experimental data is kept, but the smallness of the experimental error allows to improve the constraint of nu mass (muon based) down to 0.021 MeV, provided that nu mass (electron based) is as low as indicated by the 3H beta decay. An analogous constraint for the nu mass (tau based) is not possible since in this case the decay width has a larger experimental error.
Cite
@article{arxiv.2207.02718,
title = {An improved upper limit for the (muon based) neutrino mass},
author = {M. M. Giannini},
journal= {arXiv preprint arXiv:2207.02718},
year = {2026}
}
Comments
There is an error. The calulations are correct but the intepretation is wrong: a non zero neutrino mass may affect the Fermi constant the corresponding modification cannot be used in order to determine an upper limit on the neutrino mass