Measurement of the neutron elastic electromagnetic form factor ratio Gⁿ_E /Gⁿ_M at large momentum transfer (GEn-II experiment) at Jefferson Lab

The Super Bigbite Spectrometer (SBS) program at Jefferson Lab aims to measure the electromagnetic form factors of the nucleons. Measurement of the neutron electromagnetic form factor ratio Gⁿ_E /Gⁿ_M at High Q² (GEn -II experiment) ran during the 2022-2023 in experimental Hall A of Jefferson Lab. GEn -II experiment measured the Gⁿ_E /Gⁿ_M form factor ratio at Q² = 2.9, 6.8 and 9.8 GeV² by scattering a polarized electron beam off of a polarized ³He target. Double spin asymmetry of the scattered neutron is used to get the neutron form factor ratio. Open nature of the spectrometer and the direct line of sight from the target to the tracking detectors makes the analysis challenging especially at high Q² points. Analysis progress so far along with early analysis results will be presented.