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Electromagnetic couplings of the ChPT Lagrangian from the perturbative chiral quark model | V. E. Lyubovitskij
; Th. Gutsche
; Amand Faessler
; R. Vinh Mau
; | Date: |
24 Sep 2001 | Journal: | Phys.Rev. C65 (2002) 025202 | Subject: | hep-ph | Affiliation: | Tuebingen University) and R. Vinh Mau (Paris University | Abstract: | 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. | Source: | arXiv, hep-ph/0109213 | Services: | Forum | Review | PDF | Favorites |
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