Theory of the pi+ pi- atom

Details Theory of the pi+ pi- atom Theory of the pi+ pi- atom

1998-10-27

arxiv.org/abs/hep-ph/9810497v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, LaTeX-file (article.sty), Talk given at the XIV International Seminar On High Energy Physics Problems "RELATIVISTIC N

Scientific paper

The relativistic perturbative approach based on the Bethe-Salpeter (BS) equation is developed for the study of the characteristics of the hadronic pi+ pi- atom. The general expression for the atom lifetime is derived. Lowest-order corrections to the relativistic Deser-type formula for the atom lifetime are evaluated within the Chiral Perturbation Theory. The lifetime of the pi+ pi- atom in the two-loop order of the Chiral Perturbation Theory is predicted to be tau_1=(3.03\pm 0.10)\times 10^{-15}~s.

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