2007/10/31 by Mariusz Puchalski, Andrzej Czarnecki, Savely G. Karshenboim · 1 citation
Physics and Astronomy · #Atomic and Molecular Physics #Atomic and Subatomic Physics Research #Nuclear physics research studies #hep-ph #physics.atom-ph
paper · pdf · doi:10.1103/physrevlett.99.203401
published as Phys.Rev.Lett.99:203401,2007 · 6 pages
arxiv created 2007/10/31 · openalex publication_date 2007/11/16 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We present a precise theoretical prediction for the decay width of the bound state of two electrons and a positron (a negative positronium ion), Gamma(Ps-)=2.087 963(12)/ns. We include O(alpha2) effects of hard virtual photons as well as soft corrections to the wave function and the decay amplitude. An outcome of a large-scale variational calculation, this is the first result for second-order corrections to a decay of a three-particle bound state. It will be tested experimentally in the new positronium-ion facility in Garching in Germany.