TY  - JOUR
AU  - Husek, T.
AU  - Goudzovski, E.
AU  - Icampf, K.
PY  - 2019
DA  - 2019//
TI  - Precise Determination of the Branching Ratio of the Neutral-Pion Dalitz Decay
T2  - Phys. Rev. Lett.
JO  - Physical Review Letters
SP  - 022003
EP  - 6pp
VL  - 122
IS  - 2
PB  - Amer Physical Soc
AB  - We provide a new value for the ratio R = Gamma(pi(0) -> e(+)e(-)gamma(gamma))/Gamma(pi(0) -> gamma gamma) = 11.978(6) x 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 pi(0)-transition-form-factor slope. The ratio R translates into the branching ratios of the two main pi(0) decay modes: B(pi(0) -> gamma gamma) = 98.8131(6)% and B(pi(0) -> e(+)e(-)gamma(gamma)) = 1.1836(6)%.
SN  - 0031-9007
UR  - http://arxiv.org/abs/1809.01153
UR  - https://doi.org/10.1103/PhysRevLett.122.022003
DO  - 10.1103/PhysRevLett.122.022003
LA  - English
N1  - WOS:000456041800006
ID  - Husek_etal2019
ER  -