Photon Decay of Hyperons

The photon mode of decay of the ${\Sigma }^{+}$ and ${\Lambda }^0$ is examined. The lifetime and angular distributions of the decay products are written in terms of the three physical parameters of the problem without restriction as to invariance under space reflection, charge conjugation, or time reversal. An estimate of these parameters is made by use of perturbation theory, and, although ambiguous, it indicates that this mode may soon be experimentally detectable.