arXiv:hep-ph/9810497·v1·High Energy Physics — Phenomenology
Theory of the pi+ pi- atom
M.A. Ivanov (BLThP, JINR, Dubna, Russia)🇷🇺 · V.E. Lyubovitskij (BLThP, JINR, Dubna, Russia and Tomsk University, Russia)🇷🇺 · E.Z. Lipartia (LCTA, JINR, Dubna, Russia and IHEP, Tbilisi University,Georgia)🇷🇺 · A.G. Rusetsky (BLThP, JINR, Dubna, Russia and IHEP, Tbilisi University,Georgia)🇷🇺
Abstract
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.
Comments: 6 pages, LaTeX-file (article.sty), Talk given at the XIV International Seminar On High Energy Physics Problems "RELATIVISTIC NUCLEAR PHYSICS AND QUANTUM CHROMODYNAMICS",Dubna Aug. 17-22,1998