1997/04/30 by Ulf-G. Meißner, G. Müller, S. Steininger +1 · 7 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph #nucl-th
paper · pdf · doi:10.1016/s0370-2693(97)00666-7
published as Phys.Lett. B406 (1997) 154-160; Erratum-ibid. B407 (1997) 454 · 13 pp, LaTeX file, 2 figures (uses epsf), two entries in table 1 changed due to change of basis, one footnote added, refs updated, accepted for publication in Phys. Lett. B
openalex publication_date 1997/07/01 · arxiv created 1997/07/02 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We construct the generating functional of two flavor chiral perturbation theory including the effects of virtual photons in the one loop approximation. As an application, we calculate the electromagnetic corrections to the elastic ππ scattering amplitude, in particular to its S--wave threshold parameters. Numerical estimates are given for the reaction π0 π0 → π0 π0. These electromagnetic effects are found to be smaller than the hadronic two-loop corrections for the scattering length a0. The effective range b0 increases by 36% due to the unitary cusp.