piN scattering and electromagnetic corrections in the perturbative chiral quark model

Physics – High Energy Physics – High Energy Physics - Phenomenology

Scientific paper

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12 pages, 2 figures

Scientific paper

10.1016/S0370-2693(01)01142-X

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.

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