piN scattering and electromagnetic corrections in the perturbative chiral quark model
arXiv:hep-ph/0108134 · doi:10.1016/S0370-2693(01)01142-X
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.
12 pages, 2 figures