piN scattering and electromagnetic corrections in the perturbative chiral quark model
Abstract
We apply the perturbative chiral quark model to give predictions for the electromagnetic O(p2) low-energy couplings of the ChPT effective Lagrangian that define the electromagnetic mass shifts of nucleons and first-order (e2) 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.
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