Isospin mixing effects in the low-energy KN-πΣ interaction

New strong coupled-channels KN-πΣ potential, reproducing all existing experimental data and suitable for using in an accurate few-body calculations, is constructed. Isospin breaking effects of direct inclusion of the Coulomb interaction and using of physical masses in calculations are investigated. The 1s level shift and width of kaonic hydrogen, consistent with the scattering data, was obtained and the corresponding exact strong K-p scattering length was calculated. One- and two-pole form of Λ(1405) resonance was considered