Electromagnetic corrections to π ^-p scattering length from pionic hydrogen
classification
✦ hep-ph
keywords
electromagneticlengthscatteringalphaatomchargeclosedcorrection
read the original abstract
We derive a closed, model space independent, expression for the electromagnetic correction factor $\delta $ to the scattering length $a$ extracted from a hydrogenic atom with an extended charge to order $\alpha ^2$ and $a^3$ in the limit of a short ranged hadronic interaction.
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