Neutrinos Polarimetry in Muon Decay

We consider massive Dirac electron antineutrino to be observed in the muon decay, ${\mu }^{-}\to e^{-}+{\bar{\nu }}_e+{\nu }_{\mu }$, at rest in the LAB reference frame. A computation of ${\bar{\nu }}_e$ differential direct spectral shape and angular distribution was performed. This has resulted in transverse component of the neutrino polarization emerging from the nonstandard S, T sector of the Lorentz structure in the Fermi leptonic charged weak interaction. The calculation is based on empirical values of the coupling parameters.