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

Tomáš Husek; Evgueni Goudzovski; Karol Kampf

doi:10.1103/PhysRevLett.122.022003

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

Physics and Astronomy

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Abstract

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 language	English
Article number	022003
Journal	Physical Review Letters
Volume	122
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevLett.122.022003
Publication status	Published - 18 Jan 2019

ASJC Scopus subject areas

General Physics and Astronomy

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10.1103/PhysRevLett.122.022003Licence: Creative Commons: Attribution (CC BY)

Husek_et_al_Precise_determination_of_the_branching_ratio_Physical_Review_Letters_2019
Husek et al, Precise determination of the branching ratio of the Neutral-Pion Dalitz decay, Physical Review Letters, Vol. 122, Article No. 022003, Published 18/01/2019, https://doi.org/10.1103/PhysRevLett.122.022003
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https://doi.org/10.1103/PhysRevLett.122.022003Licence: Creative Commons: Attribution (CC BY)

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title = "Precise determination of the branching ratio of the Neutral-Pion Dalitz decay",

abstract = "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)\%.",

author = "Tom{\'a}{\v s} Husek and Evgueni Goudzovski and Karol Kampf",

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AU - Husek, Tomáš

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Y1 - 2019/1/18

N2 - 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)%.

AB - 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)%.

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

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