[JLab-seminars] Physics Interview Seminar: Provakar Datta; Probing the Neutron’s Internal Structure via High-Q2 Electromagnetic Form Factor Measurements

[Stephanie Tysor]

Physics Interview Seminar
Provakar Datta
 University of Connecticut
Probing the Neutron’s Internal Structure via High-Q2
Electromagnetic Form Factor Measurements
Abstract:
The electromagnetic form factors (EMFFs) are among the most basic observables sensitive to the nucleon’s internal structure. Knowing their values with high precision in a wide range of squared four-momentum transfer (Q2) is essential for the advancement of QCD. The high-Q2 precision data of the nucleon EMFFs are scarce due to the challenges associated with such measurements. To address this, the Super BigBite Spectrometer (SBS) collaboration is currently running multiple experiments in Jefferson Lab’s experimental Hall A to precisely measure the nucleon EMFFs with unprecedented Q2 reach.

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 (GMn ) 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 GnM from the ratio of neutron-coincident (D(e, e′n)) to proton-coincident (D(e, e′p)) quasi-elastic electron scattering from deuteron. The scattered electrons were detected using the BigBite spectrometer, which features multiple Gas Electron Multiplier (GEM) layers with a large active area for high-precision tracking at very high rates. Simultaneous nucleon detection was performed with the Super BigBite spectrometer, which utilizes a dipole magnet with a large solid angle acceptance at forward angles, along with a novel hadron calorimeter that has very high and comparable detection efficiencies for both protons and neutrons. This setup could handle very high luminosity, making high-Q2 measurements feasible. In this talk, I will provide an overview of the SBS-GMn experiment, briefly discussing the underlying theory, measurement techniques, associated technical challenges, and physics analysis
methodology, and conclude by presenting preliminary results.

Wednesday, October 16, 2024
1:00 pm – 2:30 pm
L102



Stephanie Tysor
Division Administrator
Physics Division
Jefferson Lab
757-269-6005


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