Isospin violation in low-energy charged pion-kaon scattering

Details Isospin violation in low-energy charged pion-kaon scattering Isospin violation in low-energy charged pion-kaon scattering

2001-12-11

arxiv.org/abs/hep-ph/0112154v1

Phys.Lett. B529 (2002) 69-76

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pp, 2 figs

Scientific paper

10.1016/S0370-2693(02)01192-9

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

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