Nonleptonic and Weak-Electromagnetic Decays of Hyperons in the Pole Model

An estimate is made for the contribution of the decuplet poles to the weak decays of hyperons using the Rarita-Schwinger formalism for spin-$\frac{3}{2}$ fields. $\mathrm{SU}\left(3\right)\mathrm{}$ symmetry is used in conjunction with the Gourdin-Salin model for the $D-B-\pi$ and $D-B-\gamma$ couplings. It is shown that the decuplet contribution is large for the parity-violating amplitudes. For weak-electromagnetic decays, this predicts asymmetry parameters which are at variance with earlier calculations. The decay rate for ${\Sigma }^{+}\to p\gamma$ agrees well with the experimental result.