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arXiv · hep-ph/0211433

Electromagnetic corrections to $π^-$p scattering length from pionic hydrogen

T. E. O. Ericson·B. Loiseau·S. Wycech
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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 $α^2$ and $a^3$ in the limit of a short ranged hadronic interaction.

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T. E. O. Ericson, B. Loiseau, S. Wycech. 2002-11-27. Electromagnetic corrections to $π^-$p scattering length from pionic hydrogen. https://doi.org/10.1016/s0375-9474(03)01145-x

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