Perturbative framework for the study of the properties of the pi(+)pi(-) atom

Lyubovitskij, V. E.; Lipartia, E. Z.; Rusetsky, A. G.

Perturbative framework for the study of the properties of the pi(+)pi(-) atom

Authors

Lyubovitskij, V. E.

Lipartia, E. Z.

Rusetsky, A. G.

Description

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)