Isospin violation in low-energy charged pion-kaon scattering
Bastian Kubis, Ulf-G. Meißner
Abstract
We evaluate the isospin breaking corrections to the scattering amplitude π- K+ -> π- K+ at threshold in the framework of chiral perturbation theory. This channel is of particular interest for the strong 2S-2P energy level shift in pion-kaon bound states. While a prediction of this level shift is hampered by a large uncertainty in the isoscalar scattering length, we find only a moderate uncertainty of about 3% in the electromagnetic corrections which are relevant for the extraction of the scattering lengths from experiment
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