Pionic correlations and meson-exchange currents in two-particle emission induced by electron scattering

Details Pionic correlations and meson-exchange currents in two-particle emission induced by electron scattering Pionic correlations and meson-exchange currents in two-particle emission induced by electron scattering

2010-08-04

arxiv.org/abs/1008.0753v1

Phys.Rev.C82:044601,2010

Physics

Nuclear Physics

Nuclear Theory

14 pages, 15 figures

Scientific paper

10.1103/PhysRevC.82.044601

Two-particle two-hole contributions to electromagnetic response functions are computed in a fully relativistic Fermi gas model. All one-pion exchange diagrams that contribute to the scattering amplitude in perturbation theory are considered, including terms for pionic correlations and meson-exchange currents (MEC). The pionic correlation terms diverge in an infinite system and thus are regularized by modification of the nucleon propagator in the medium to take into account the finite size of the nucleus. The pionic correlation contributions are found to be of the same order of magnitude as the MEC.

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