Inapplicability of the narrow-width approximation in the decays φ → γ a0 and φ → γ f0
Achasov N. N. , Gubin V. V.
The narrow-width approximation, which is used in theoretical and experimental studies of the radiative decays φ—>γα0 and φ—>y/o, is not valid for the /0 and a0 resonances. How to properly use the corrections for the finite width is shown. © 7995 American Institute of Physics.