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Physical Review C 65 (2002) 025202
Electromagnetic couplings of the ChPT Lagrangian from the perturbative chiral quark model
V.E. Lyubovitskij, T. Gutsche, A. Faessler, R. Vinh Mau1

We apply the perturbative chiral quark model to the study of the low-energy pi-N interaction. Using an effective chiral Lagrangian we reproduce the Weinberg-Tomozawa result for the S-wave pi-N 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 pi-N scattering amplitude. Finally, we estimate the leading isospin-breaking correction to the strong energy shift of the pi(-)p atom in the 1s state, which is relevant for the experiment "Pionic Hydrogen" at PSI.
1 :  LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
Physique/Physique des Hautes Energies - Phénoménologie
Chiral symmetry – Relativistic quark model – Relativistic effective Lagrangian – Pion-nucleon amplitude – Hadronic atoms
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