## Abstract

We calculate at two-loop order in chiral perturbation theory the electromagnetic corrections to the leading-order 2π exchange NN interaction proportional to g_{A}^{0} and g_{A}^{2}. The resulting 2πγ exchange potential contains isospin-breaking components which reach up to about -2% of the corresponding isovector 2π exchange potential. With a value of only -17keV at r = m_{π}^{-1} = 1.4fm the charge-independence breaking central potential obtained here is negligibly small in comparison to the one generated by the isoscalar c _{3} contact vertex. Our calculation confirms that the largest long-range isospin-violating NN potentials arise from the 2πγ exchange diagrams involving the large low-energy constants c_{4} ≃ -c _{3} ≃ 3.3GeV^{-1} representing the important Δ(1232) dynamics.

Original language | English |
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Pages (from-to) | 207-212 |

Number of pages | 6 |

Journal | European Physical Journal A |

Volume | 31 |

Issue number | 2 |

DOIs | |

State | Published - Feb 2007 |

## Keywords

- 12.20.Ds Specific calculations
- 13.40.Ks Electromagnetic corrections to strong- and weak-interaction processes
- 21.30.Cb Nuclear forces in vacuum

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