Analysis Progress of the NTPE Experiment with Super BigBite Spectrometer at Jefferson Lab

The first measurements of elastic electron nucleon scattering with polarization transfer, allowing to separate the electric and magnetic nucleon form factors, showed a significant discrepancy with Rosenbluth measurement of the cross section of the same process. The two-photon exchange, suspected to be the cause of this observation, got a major focus since then. While this effect has been evidenced on electron-proton data, it had never been measured in electron neutron before. We have measured the ratio of electron-neutron to electron-proton scattering cross section ratios off deuterium simultaneously using the Durand technique proposed in 1959, at two different beam energies but at the same momentum transfer Q^2. This measurement, combined with the input of the Rosenbluth measurements on the proton, will allow to perform the first Rosenbluth measurements in electron-neutron elastic scattering. The comparison between such a measurement and polarization transfer measurements in electron-neutron scattering will provide an estimation of the magnitude for the two-photon exchange in this process. NTPE ran together with GMN, which was the first SBS experiment to run. In this presentation we will present the NTPE experiment, with an emphasis on the experimental analysis method, the progress in the data analysis and the remaining challenges to overcome.