Electromagnetic couplings of the chiral perturbation theory Lagrangian from the perturbative chiral quark model

V. E. Lyubovitskij, Th Gutsche, Amand Faessler, R. Vinh Mau

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37 Citations (Scopus)


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(p2) low-energy couplings of the chiral perturbation theory effective Lagrangian that define the electromagnetic mass shifts of nucleons and first-order (e2) 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 languageEnglish
Pages (from-to)252021-2520210
Number of pages2268190
JournalPhysical Review C - Nuclear Physics
Issue number2
Publication statusPublished - Feb 2002
Externally publishedYes


ASJC Scopus subject areas

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

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