1999/11/29 by H. Sazdjian
Physics and Astronomy · #Nuclear physics research studies #Quantum Chromodynamics and Particle Interactions #Quantum and Classical Electrodynamics #hep-ph
paper · pdf · doi:10.1016/s0920-5632(00)00575-2
published as Nucl.Phys.Proc.Suppl. 86 (2000) 271-274 · 4 pages, 1 figure (included in the text), Latex. Uses espcrc2.sty. Talk given at the QCD99 Conference, Montpellier, 7-13 July 1999. To appear in the Proceedings
arxiv created 1999/11/29 · openalex publication_date 2000/06/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The relationship between the pionium lifetime and the ππ scattering lengths is established, including the sizable electromagnetic corrections. The bound state formalism that is used is that of constraint theory which provides a covariant three-dimensional reduction of the Bethe--Salpeter equation. The framework of generalized chiral perturbation theory allows then an analysis of the lifetime value as a function of the ππ scattering lengths, the latter being dependent on the quark condensate value.