PT Journal
AU Husek, T
   Goudzovski, E
   Icampf, K
TI Precise Determination of the Branching Ratio of the Neutral-Pion Dalitz Decay
SO Physical Review Letters
JI Phys. Rev. Lett.
PY 2019
BP 022003
EP 6pp
VL 122
IS 2
DI 10.1103/PhysRevLett.122.022003
LA English
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)%.
ER