Earlier summaries of Jl-meson interactions and properties are given in references (1 to 7).
We shall confine our attention in this paper principally to recent developments. The most …

The assumption of vanishing neutrino mass leads to a group of transformations of the
neutrino field which leave commutation relations and free-field Hamiltonian invariant but …

Department of Physics and I. aboratory for nuclearScience, Massachusetts Institute of
Technology, Cambridge, Massachusetts (Received March 4, 1957)''T has been …

The distribution of the decay electrons from polarized μ mesons is calculated, without
presumption of parity conservation, time-reversal invariance, or charge-conjugation …

The discovery that the neutrinos from pion-muon-neutrino (7r-J..!-v) decay are distinct from
the neutrinos of/3 decay has made it clear that a distinct class of particles exists which, so …

The measure of the asymmetry fS as a function of y gives t'a and tP. The magnitude of the
parameter f, which isthe degree of polarization of the p meson, depends on the …

84 Sherman Frankel the spins and relative momenta of the muon and electron are available
as kinematic quantities that can be measured and employed to describe the decay process …

On the basis of the hypothesis that the same form of interaction acts among any spin-½
particles, it is interesting to apply the interaction law found for β decay to the muon …

In the interaction (1) we have assumed that a w-meson inter-acts directly with ap,-meson. Of
the alternative assumptions con-cerning the mechanism of the decay, that in which the …

They have pointed out that parity nonconservation implies a polarizationof the spin of the
muon emitted from stopped pions in (1) along the direction of motion and that furthermore …