pi+pi- Atom in Chiral Theories

A. G. Rusetsky (JINR; Dubna; Dubna); E. Z. Lipartia (JINR; IHEP; M. A. Ivanov (JINR; Tbilisi State University); Tomsk State University); V. E. Lyubovitskij (JINR

arxiv: hep-ph/9807474 · v1 · submitted 1998-07-23 · ✦ hep-ph

pi+pi- Atom in Chiral Theories

M. A. Ivanov (JINR , Dubna) , V. E. Lyubovitskij (JINR , Dubna , Tomsk State University) , E. Z. Lipartia (JINR , IHEP , Tbilisi State University)

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A. G. Rusetsky (JINR

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classification ✦ hep-ph

keywords atomchiralrelativisticapproachapproachesatomsbethe-salpetercorrection

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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\pm 3.1 %.

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pi+pi- Atom in Chiral Theories

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