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Precise determination of the branching ratio of the neutral-pion Dalitz decay

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	Husek, Tomas; Goudzovski, Evgueni; Kampf, Karol
	This document is a artículoDate2019
	We 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 2 orders of magnitude more precise than the current Particle Data Group average. It 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. The ratio R translates into the branching ratios of the two main π0 decay modes: B(π0→γγ)=98.8131(6)% and B(π0→e+e−γ(γ))=1.1836(6)%.
	Husek, Tomas Goudzovski, Evgueni Kampf, Karol 2019 Precise determination of the branching ratio of the neutral-pion Dalitz decay Physical Review Letters 122 022003
	https://doi.org/10.1103/PhysRevLett.122.022003