Year: 2025
Type: conference-paper
Abstract: The PRad experiment at Jefferson Lab has precisely measured the cross sections for elastic electron-proton scattering at four momentum transfer square $2\times 10^{-4} < Q^2 < 6\times 10^{-2}$ GeV$^2$. The proton's charge radius was extracted based on the measured proton form factors at very low $Q^2$. This experiment utilized a high-precision, hybrid calorimeter (HyCal) to precisely determine the energy and position of electrons and photons. The HyCal's inner array of PbWO$_4$ modules can well separate two incident particles with a distance greater than about 30 mm (of the module size) on the detection plane. Together with the GEM detectors placed in front of the HyCal, which serve as a veto detector for neutral particles, the PRad detector system is capable of measuring and identifying the scattered electrons and the radiative photons simultaneously from the elastic $ep$ and $ee$ scattering processes. In this proceeding, the preliminary results of the direct radiative effects measurement from the PRad experiment are discussed; the expected improvements with the upcoming PRad-II experiment are also presented.
DOI: 10.22323/1.483.0072
Authors: Chao Peng, Dipangkar Dutta
Institution: Argonne National Laboratory
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
OpenAlex ID: W4415516622
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