  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.
