### Abstract

We apply the perturbative chiral quark model to the study of the low-energy πN interaction. Using an effective chiral Lagrangian we reproduce the Weinberg-Tomozawa result for the S-ware πN scattering lengths. After inclusion of the photon field we give predictions for the electromagnetic O(p^{2}) low-energy couplings of the chiral perturbation theory effective Lagrangian that define the electromagnetic mass shifts of nucleons and first-order (e^{2}) radiative corrections to the πN scattering amplitude. Finally, we estimate the leading isospinbreaking correction to the strong energy shift of the π^{-}p atom in the 1s state, which is relevant for the experiment "pionic hydrogen" at PSI.

Original language | English |
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Pages (from-to) | 252021-2520210 |

Number of pages | 2268190 |

Journal | Physical Review C - Nuclear Physics |

Volume | 65 |

Issue number | 2 |

Publication status | Published - Feb 2002 |

Externally published | Yes |

### ASJC Scopus subject areas

- Physics and Astronomy(all)
- Nuclear and High Energy Physics

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## Cite this

*Physical Review C - Nuclear Physics*,

*65*(2), 252021-2520210.