Isospin violation in low-energy charged pion-kaon scattering
High Energy Physics - Phenomenology
2009-11-07 v1
Abstract
We evaluate the isospin breaking corrections to the scattering amplitude \pi^- K^+ -> \pi^- 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
Cite
@article{arxiv.hep-ph/0112154,
title = {Isospin violation in low-energy charged pion-kaon scattering},
author = {Bastian Kubis and Ulf-G. Meißner},
journal= {arXiv preprint arXiv:hep-ph/0112154},
year = {2009}
}
Comments
9 pp, 2 figs