Electromagnetic Corrections to Charged Pion Scattering at Low Energies
M. Knecht, A. Nehme
Abstract
The electromagnetic corrections to the low energy scattering amplitude involving charged pions only are investigated at leading and next-to-leading orders in the two-flavour chiral expansion. As an application, the corresponding variation in the strong 2S-2P level shift is evaluated. The relative variation is of the order of 5%.
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