Perturbative framework for the study of the properties of the pi(+)pi(-) atom
arXiv:hep-ph/9706244
Abstract
The perturbative framework is developed for the calculation of the pi(+)pi(-) atom characteristics (energy level shift and lifetime) on the basis of the field-theoretical Bethe-Salpeter approach. A closed expression for the first-order correction to the pi(+)pi(-) atom lifetime has been obtained.
11 pages, LaTeX-file (elsart.sty)