Δ Isobar Degrees of Freedom in the 3He Transverse Electron Scattering Response Function

The importance of Δ(1232) isobar degrees of freedom is investigated for the transverse(e,e') response of3He in the quasi-elastic peak region and beyond (considered momentum transfer range: 500≤q≤1,000 MeV/c). Besides Δ isobar currents (Δ-IC) meson exchange currents and relativistic corrections to the nucleonic one-body current are included. The calculation is carried out by using the Lorentz integral transform (LIT) method. Results for the transverse response function RT are presented up to q=700 MeV/c,whereas for higher q only some preliminary results for the LIT ofRTare discussed. In the quasi-elastic peak region Δ IC enhance RT by about 5 % and tend to cancel three-nucleon force effects. One observes an excellent agreement with experimental RT results. Particularly strong Δ -IC contributions are found for transitions into the final state with isospin T=3/2,which is only reachable in three-body break-up reactions.