Abstract
In quasielastic electron scattering off nuclei, there are complications above and beyond the effects of final-state interactions. As well as the constituent nucleons, virtual pi-mesons in the nucleus (from the interaction between nucleons) can also interact with the electromagnetic probe. To date, there have been only two calculations of the contributions of pions to the quasielastic cross-section. Both calculations of Meson Exchange Currents (MEC) are non-relativistic in nature. The first looks at the case where the virtual photon couples to pions, and the end effect is that one nucleon is knocked out [1]. The results are somewhat confusing, as they find that MEC’s suppress the transverse response and also significanty affect the longitudinal response. Both these results are contrary to naive expectations about isovector exchange currents. The second looks at the case where two nucleons are knocked out via the pionic current [2]. We repeat calculations for both processes with one major modification.
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