piN scattering and electromagnetic corrections in the perturbative chiral quark model
V. E. Lyubovitskij, Th. Gutsche, Amand Faessler, R. Vinh Mau
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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