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VOLUME 66 (1997) | ISSUE 12 | PAGE 747
Perturbation theory for the π+π- atom
A perturbation-theory framework is developed for calculation of the characteristics of the π+π~ atom on the basis of the field-theoretical Bethe-Salpeter approach. A closed expression is obtained for the first-order correction to the π+π_ atom lifetime. PACS: 03.65.-w, 13.75.Lb, 14.40.Aq