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We calculate isospin breaking in pion-nucleon scattering in the thresholdregion in the framework of covariant baryon chiral perturbation theory. Alleffects due to quark mass differences as well as real and virtual photons areconsistently included. As an application, we discuss the energy dependence ofthe triangle relation that connects elastic scattering on the proton pi+- p -->pi+- p with the charge exchange reaction pi- p --> pi0 n.

Isospin violation in low-energy pion-nucleon scattering revisited