Neutrinos Polarimetry in Muon Decay

We consider massive Dirac electron antineutrino to be observed in the muon decay, $μ^{-} \rightarrow e^- +\barν_{e} + ν_μ$, at rest in the LAB reference frame. A computation of $\barν_{e}$ 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.

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