Abstract
We present a phenomenological review of the decay KL → π0γγ, through the two dominant contributions of the π loop and vector meson dominance mechanisms. We have paid particular attention to consistency on the one hand between recent experimental measurements and theoretical models of KL → π0γγ decay and on the other hand between KL → π0γγ and other rather similar decays as KS → γγ, KL → γγ and η → π0γγ.

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