Relativistic pionic effects in quasielastic electron scattering

✍ Scribed by J.E. Amaro; M.B. Barbaro; J.A. Caballero; T.W. Donnelly; A. Molinari

• Publisher: Elsevier Science
• Year: 2002
• Tongue: English
• Weight: 478 KB
• Volume: 697
• Category: Article
• ISSN: 0375-9474
• DOI: 10.1016/s0375-9474(01)01253-2

✦ Synopsis

The impact of relativistic pionic correlations and meson-exchange currents on the response functions for electromagnetic quasielastic electron scattering from nuclei is studied in detail. Results in first-order perturbation theory are obtained for one-particle emission electronuclear reactions within the context of the relativistic Fermi gas model. Improving upon previous analyses where nonrelativistic reductions of the currents were performed, here a fully relativistic analysis in which both forces and currents are treated consistently is presented. Lorentz covariance is shown to play a crucial role in enforcing the gauge invariance of the theory. Effects stemming uniquely from relativity in the pionic correlations are identified and, in particular, a comprehensive study of the self-energy contributions and of the currents associated with the pion is presented. First-and second-kind scaling for high momentum transfer is investigated.