pi+pi- Atom in Chiral Theories
M. A. Ivanov, V. E. Lyubovitskij, E. Z. Lipartia, A. G. Rusetsky
Abstract
We review the existing theoretical approaches to the study of the observables of hadronic atoms. In the relativistic perturbative approach based on the Bethe-Salpeter equation and Chiral Perturbation Theory we derive the general expression for the pi+pi- atom lifetime. The lowest-order correction to the relativistic Deser-type formula for the atom width is predicted to be 6.1 3.1 %.
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