Preliminary Results of the SBS-GMn Experiment with Super BigBite Spectrometer at Jefferson Lab's Hall A

The nucleon electromagnetic form factors (EMFFs) are among the most basic observables sensitive to the nucleon's internal structure. However, aside from G_M^p, high-precision data for the nucleon EMFFs at high-Q² are scarce due to the challenges associated with such measurements. To address this, the Super BigBite Spectrometer (SBS) collaboration is currently conducting a series of experiments in Jefferson Lab's experimental Hall A to extend the high-precision measurements of the remaining nucleon EMFFs up to or beyond Q² = 10 (GeV/c)². The first of these experiments, SBS-GMn, was completed during the October 2021 to February 2022 run period, aiming to extend the high-precision measurements of the neutron magnetic form factor (G_Mⁿ) in the Q² range of 4 to 13.6 (GeV/c)² using the "ratio" method. In this approach, systematic errors are greatly reduced by extracting G_Mⁿ from the ratio of neutron-coincident (D(e,e'n)) to proton-coincident (D(e,e'p)) quasi-elastic electron scattering from deuteron. In this talk, I will provide an overview of the SBS-GMn experiment, focusing on the physics analysis methodology, and conclude by presenting preliminary results.