arXiv:hep-ph/0108134·v2·High Energy Physics — Phenomenology
piN scattering and electromagnetic corrections in the perturbative chiral quark model
V. E. Lyubovitskij (Tuebingen U.)🇩🇪 · Th. Gutsche (Tuebingen U.)🇩🇪 · Amand Faessler (Tuebingen U.)🇩🇪 · R. Vinh Mau (Paris U.)🇫🇷
Abstract
We apply the perturbative chiral quark model to give predictions for the electromagnetic O(p^2) low-energy couplings of the ChPT effective Lagrangian that define the electromagnetic mass shifts of nucleons and first-order (e^2) radiative corrections to the piN scattering amplitude. 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.
Comments: 12 pages, 2 figures