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

Abstract

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.

14 pages, 15 figures

References in corpus (6)

• The 2p-2h electromagnetic response in the quasielastic peak and beyond
• Gauge and Lorentz invariant one-pion exchange currents in electron scattering from a relativistic Fermi gas
• Final-state interactions and superscaling in the semi-relativistic approach to quasielastic electron and neutrino scattering
• Role of 2p-2h MEC excitations in superscaling
• Delta-isobar relativistic meson exchange currents in quasielastic electron scattering
• Meson-exchange currents and final-state interactions in quasielastic electron scattering at high momentum transfers

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