Speaker
Description
The PRad experiment at Jefferson Lab measured the proton charge radius using elastic electron-proton scattering at very low momentum transfer (a minimum Q^2 close to 2*10^-4 GeV^2 ), avoiding common systematic uncertainties by using a windowless cryogenic hydrogen gas target and a magnetic-spectrometer-free, calorimeter-based detector system. Its result favored a smaller proton radius, consistent with muonic hydrogen measurements. The upcoming PRad-II experiment aims to improve statistical precision and reduce systematics with upgraded two GEM detectors of four planes and higher luminosity. A key component of PRad-II is implementing a blind analysis, designed to eliminate bias in the extraction of the charge radius. I will present the physics of the PRad experiment and then the strategy and structure of the blind framework.
