Mu Decay with Nonconservation of Parity

The distribution of the decay electrons from polarized $\mu$ mesons is calculated, without presumption of parity conservation, time-reversal invariance, or charge-conjugation invariance. The four-component neutrino theory is used. The result is expressed in terms of three parameters, $\rho$, $\alpha$, and $\zeta$, of which $\rho$ is the usual Michel parameter. Theoretical inequalities among these parameters are given. An analysis of experimental data is made in terms of these parameters, and the results are found to be in fair agreement with the more stringent requirements of two-component neutrino theory.