Forward-angle He-3(e,e'pi(+/-)) coincident electroproduction and the search for Delta's in the ground state of He-3

Forward-angle coincident electroproduction cross sections of charged pions from He-3 have been measured at electron energies E(0) = 855, 675, 600, and 555 MeV. The overall features of the data for energy transfers of omega = 370 to 430 MeV with pions detected along the momentum transfer axis are reproduced in terms of a microscopic model, including pole terms, final state rescattering and produced and preformed Delta resonances. Separation of the cross section into its longitudinal and transverse parts was performed at Q(2) = 0.045 (GeV/c)(2). The longitudinal part of the cross section in the pi(+) channel does not contradict with the assumption of a preformed Delta(++).