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Seminar | Physics Seminar | Physics Division

The Proton Charge Radius Experiment at JLab

PHY Seminar

Abstract: The Proton Charge Radius (PRad) Experiment was performed in 2016 in Hall B at Jefferson Lab, with both 1.1- and 2.2-GeV unpolarized electron beams. The experiment aimed to measure the e-p elastic scattering cross section under unprecedented low values of the momentum transfer squared region (Q2 = 2 x 10-4 to 0.06 (GeV/c)2), with a sub-percent precision. The PRad Experiment used a calorimetric method that was magnetic spectrometer free. Its detector setup included a large-acceptance, high-resolution calorimeter and two large-area, high-spatial-resolution gas electron multiplier detectors. For better control over systematic uncertainties, the absolute e-p elastic scattering cross section was normalized to that of the well-known Møller scattering process, which was measured simultaneously with similar kinematics and detector acceptances. The windowless H2-gas-flow target used in the experiment largely removed a typical background source, the target cell windows. In this talk, we will discuss details of the data analysis and present PRad results.