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Status and Update of the SBS Experiment to Measurement the Neutron Electromagnetic Form Factor Ratio (G<sub>E</sub><sup>n</sup>/G<sub>M</sub><sup>n</sup>) up to Q<sup>2</sup> of 9.8 GeV<sup>2</sup>

ORAL

Abstract

The Super BigBite Spectrometer (SBS) program was designed to measure three out of the four elastic nucleon form factors. As part of the SBS program, the GEn-II experiment aims to measure the neutron electromagnetic form factor ratio (GEn/GMn) using the double polarization method at Q2 values of 2.9, 6.8, and 9.8 GeV2, thus enabling the extraction of GEn to the highest values of Q2 yet achieved. Data collection took place from October 2022 to October 2023 and analysis of the data is underway. The experiment studied quasi-elastic (QE) electron-neutron scattering using a longitudinally polarized electron beam from the Continuous Electron Beam Accelerator Facility (CEBAF) and a novel high-luminosity polarized 3He target. The ratio GEn/GMn was extracted from the double spin asymmetry measured in electron-neutron coincidence events. In this talk I will discuss an overview of the experiment, the analysis techniques being applied to extract QE neutron events, the challenges faced with that extraction, and the status of the GEn analysis.

Presenters

  • Jacob M Koenemann

    University of Virginia

Authors

  • Jacob M Koenemann

    University of Virginia