Two-body and three-body weak radiative decays of hyperons are studied in context of the $\mathrm{SU}\left(3\right)\mathrm{}$ scheme. The various sum rules that follow from $T-L$ symmetries as well as those due to $R$ invariance are derived. A pole model is set up for the two-body decays of both radiative and pionic type and is used to predict the amplitudes and decay rates for the photonic modes. In particular, the rate for ${\Sigma }^{+}\to p+\gamma$ calculated in this model agrees with the recent experimental value.

• Received 7 July 1965

DOI:https://doi.org/10.1103/PhysRev.140.B1144