Relativistic Effects in Electroweak Nuclear Responses

Details Relativistic Effects in Electroweak Nuclear Responses Relativistic Effects in Electroweak Nuclear Responses

2000-12-06

arxiv.org/abs/nucl-th/0012021v2

Physics

Nuclear Physics

Nuclear Theory

9 pages, 3 figures, to appear in "Proceedings of the VIII Convegno su Problemi di Fisica Nucleare Teorica, 18-20 October 2000"

Scientific paper

The electroweak response functions for inclusive electron scattering are calculated in the Relativistic Fermi Gas model, both in the quasi-elastic and in the $\Delta$ peak regions. The impact of relativistic kinematics at high momentum transfer is investigated through an expansion in the initial nucleonic momentum, which is however exact in the four-momentum of the exchanged boson. The same expansion is applied to the meson exchange currents in the particle-hole sector: it is shown that the non-relativistic currents can be corrected by simple kinematical factors to account for relativity. The left-right asymmetry measured via polarized electron scattering is finally evaluated in the quasi-elastic and $\Delta$ peaks.

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