The Derivation of Deser's Formula and Electromagnetic Corrections to the Pionium Life Time
arXiv:hep-ph/9807564
Abstract
We give the modern derivation of Deser's formula using analytic continuation of the scattering amplitude as a function of momentum. The electromagnetic corrections to the pionium lifetime are given as evaluated in a potential model.
8 pages, LaTeX-file (dubna98.sty) Talk given at the International Workshop "Hadronic Atoms and Posirtonium in the Standard Model", 26-31 May 1998, Dubna, Russia