Precise determination of the branching ratio of the Neutral-Pion Dalitz decay

Research output: Contribution to journalArticlepeer-review


Colleges, School and Institutes

External organisations

  • Fundació General de la Universitat de Valencia (FGUV)
  • Charles University in Prague


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)%.


Original languageEnglish
Article number022003
JournalPhysical Review Letters
Issue number2
Publication statusPublished - 18 Jan 2019

ASJC Scopus subject areas