Σ−ΛRelative Parity and theΣ0→Λ0+γ+γDecay

It is shown that the ${\pi }^0$-pole term predicts a large difference by nearly two to three orders of magnitude for the branching ratio of the ${\Sigma }^0\to {\Lambda }^0+2\mathrm{}\gamma$ decay mode, depending upon the value of the $\Sigma -\Lambda$ relative parity. It is further argued that this difference is not masked, even if we include other diagrams. It is thus suggested that a study of the branching ratio of the ${\Sigma }^0\to {\Lambda }^0+2\mathrm{}\gamma$ decay may serve to determine the $\Sigma -\Lambda$ relative parity.