Abstract

We briefly summarize current experimental and theoretical results on the π0 Dalitz decay, and provide a new value for the ratio R=Γ(π0→e+e−γ(γ))/Γ(π0→γγ)=11.978(6)×10−3, which is by two orders of magnitude more precise than the current PDG average. This value is obtained using the complete set of the next-to-leading-order radiative corrections in the QED sector, and incorporates up-to-date values of the π0-transition-form-factor slope. Furthermore, we present the complete set of radiative corrections for the Dalitz decays η(′)→ℓ+ℓ−γ beyond the soft-photon approximation. The corrections inevitably depend on the η(′)→γ⁎γ(⁎) transition form factors. Finally, we discuss radiative corrections for the Σ0→Λe+e− decay.

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