arXiv:hep-ph/9807474·v1·High Energy Physics — Phenomenology
pi+pi- Atom in Chiral Theories
M. A. Ivanov (JINR, Dubna)🇷🇺 · V. E. Lyubovitskij (JINR, Dubna and Tomsk State University)🇷🇺 · E. Z. Lipartia (JINR, Dubna and IHEP, Tbilisi State University)🇷🇺 · A. G. Rusetsky (JINR, Dubna and IHEP, Tbilisi State University)🇷🇺
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\pm 3.1 %.
Comments: 7 pages, LaTeX-file (dubna98.sty) Talk given at the International Workshop "Hadronic Atoms and Posirtonium in the Standard Model", 26-31 May 1998, Dubna, Russia