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Electromagnetic corrections to π-p scattering length from pionic hydrogen

T. E. O. Ericson, B. Loiseau, S. Wycech

hep-pharXiv:hep-ph/0211433

Abstract

We derive a closed, model space independent, expression for the electromagnetic correction factor δ to the scattering length a extracted from a hydrogenic atom with an extended charge to order α2 and a3 in the limit of a short ranged hadronic interaction.

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