Isospin breaking in low-energy charged pion–kaon elastic scattering
Centre de Physique Théorique, CNRS-Luminy, case 907, 13288, Marseille Cedex 09, France
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Revised: 21 December 2001
Published online: 5 April 2002
We use chiral perturbation theory to evaluate the scattering amplitude for the process at leading and next-to-leading orders in the chiral counting and in the presence of isospin breaking effects. We also discuss the influence of the latter on the combination of the -wave scattering lengths which is relevant for the 2S–2P energy level shift of atoms.
© Springer-Verlag Berlin Heidelberg / Società Italiana di Fisica, 2002