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paper

Isospin breaking in the pion-nucleon scattering lengths

arXiv:0903.3890 · doi:10.1016/j.physletb.2009.05.068

Abstract

We analyze isospin breaking through quark mass differences and virtual photons in the pion-nucleon scattering lengths in all physical channels in the framework of covariant baryon chiral perturbation theory.

7 pages, 1 figure