Abstract
We have analyzed low-energy pion-nucleon data for isospin invariance by comparing charge-exchange amplitudes derived from charge-exchange data with those predicted from recent ${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}p$ elastic data through the application of isospin invariance. A discrepancy of the order of 7% is observed beyond the contributions of the ${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}p$ Coulomb interaction and the hadronic mass differences.
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