2M. Schwartz, Phys. Rev. Letters 4, 360 (1960); TD Lee and CN Yang, Phys. Rev. Letters 4,
307 (1960). Similar considerations have recently been made by Y. Yamaguchi (to be …

KK and Yang'recently proposed that parity may~ & not be conserved in weak interactions
and sug-gested various experiments to verify their hypothesis. Two of the experiments have …

The anomalies of the neutral axial-vector current, of its divergence, and of its commutators in
the presence of electromagnetic interactions are exhibited. It is shown that it is impossible in …

The invariance of strong interactions under G, the product of charge symmetry and charge
conjugation, has important consequences for strangeness-conserving lepton interactions …

Consequences of the partially conserved axial-vector current (PCAC) hypothesis are
explored. A set of simple rules is derived which relate the matrix element for any strong …

I neutrino. This conclusion has not been changed in the light of recent work on the
nonconservation of parity in weak interactions.'However, experiments by Lokanathan and …

The apparent absence of muon-electron transi-tions without neutrinos, such as p. e+ y, p. 3e,
and p+ p~ e+ p, leads one to suspect that there is a new conservation law forbiddingthem …

In order to derive in a convincing manner the formula of Goldberger and Treiman for the rate
of charged pion decay, we consider the possibility that the divergence of the axial vector …

I. INTRODUCTION One of the major advances in particle physics of the last decade has
been the experimental discovery of· neutral currents by the Gargamelle collaboration …

Measurements of R ν and R ν, the ratios of neutral current to charged current ν and ν cross
sections, yield neutral current rates for ν and ν that are consistent with a pure V− A …