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

Apr, 2003
25 pages
Published in:
  • Nucl.Phys.A 726 (2003) 303-326
e-Print:

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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.
  • 25.30.Rw
  • 24.30.Gd
  • 24.10.Jv
  • Relativistic electromagnetic nuclear response
  • 2p–2h meson exchange currents
  • Δ resonance
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