The 2p-2h electromagnetic response in the quasielastic peak and beyond

Abstract

The contribution to the nuclear transverse response function R_T arising from two particle-two hole (2p-2h) states excited through the action of electromagnetic meson exchange currents (MEC) is computed in a fully relativistic framework. The MEC considered are those carried by the pion and by Delta degrees of freedom, the latter being viewed as a virtual nucleonic resonance. The calculation is performed in the relativistic Fermi gas model in which Lorentz covariance can be maintained. All 2p-2h many-body diagrams containing two pionic lines that contribute to R_T are taken into account and the relative impact of the various components of the MEC on R_T is addressed. The non-relativistic limit of the MEC contributions is also discussed and compared with the relativistic results to explore the role played by relativity in obtaining the 2p-2h nuclear response.

27 pages, 12 figures, revtex4; minor modifications in the discussion of the results, references added

References in corpus (12)

• New features of FORM
• Quantization of an interacting spin-3/2 field and the Delta isobar
• Superscaling of Inclusive Electron Scattering from Nuclei
• Many Body approach to the inclusive $(e,e^{\prime })$ reaction from the quasielastic to the $\Delta$ excitation region
• Superscaling in inclusive electron-nucleus scattering
• Extended Superscaling of Electron Scattering from Nuclei
• Gauge and Lorentz invariant one-pion exchange currents in electron scattering from a relativistic Fermi gas
• Delta-isobar relativistic meson exchange currents in quasielastic electron scattering
• Relativistic pionic effects in quasielastic electron scattering
• Polarization degrees of freedom in photoinduced two-nucleon knockout from finite nuclei
• Absorption mechanisms in photon induced two-body knockout
• Polarization observables in ($\vec{\gamma },\vec{N}N$) reactions

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