Isospin breaking corrections to low-energy pi-K scattering

Abstract

We evaluate the matrix elements for the processes pi^0 K^0 -> pi^0 K^0 and pi^- K^+ -> pi^0 K^0 in the presence of isospin breaking terms at leading and next-to-leading order. As a direct application the releveant combination of the S-wave scattering lengths involved in the pion-kaon atom lifetime is determined. We discuss the sensitivity of the results with respect to the input parameters.

33 pages, plain latex, 2 figures

References in corpus (3)

• QCD Isospin Breaking in Meson Masses, Decay Constants and Quark Mass Ratios
• Comparison of Pion-Kaon Scattering in SU(3) Chiral Perturbation Theory and Dispersion Relations
• $\pi K$ sum rules and the SU(3) chiral expansion

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