This value disagrees with the more precise value 0.8409 ± 0.0004 fm determined from the Lamb shift in muonic hydrogen. When using our physics knowledge about this larger density together with the information contained in the high-q data, the model dependence of the extrapolation is reduced, and different parameterizations of the pre-2010 data yield a consistent value for R = 0.887 ± 0.012 fm. Recent measurements of the Lamb shift of muonic helium-4 ions were used to infer the alpha particle charge radius. Elastic electron-proton scattering (e-p) and the spectroscopy of hydrogen atoms are the two methods traditionally used to determine the proton charge radius. This shape of G(q < q min) is closely related to the shape of the charge density ρ(r) at large radii r, a quantity that is ignored in most analyses. In this interaction, the incident electron transfers energy to the targeted proton. The problem lies in the model dependence of the parameterized G(q) needed for the extrapolation. Proton Charge Radius from Electron Scattering Ingo Sick Department of Physics, University of Basel, Basel CH4056, Switzerland Received: 21 November 2017 Accepted: 20 December 2017 Published: 30 December 2017 Abstract:The rms-radius R of the proton charge distribution is a fundamental quantity needed for precision physics. Nuclear physicists measure the proton radius using the ‘elastic’ scattering of electrons from protons. This finding could shed light on confinement and the mass distribution in the proton.
We discuss the approaches used to analyze the e-p data, partly redo these analyses in order to identify the sources of the discrepancies and explore alternative parameterizations. The proton mass radius is smaller than the electric charge radius (a dense core), while a cloud of scalar gluon activity extends beyond the charge radius. This radius, traditionally determined from elastic electron-proton scattering via the slope of the Sachs form factor G e (q 2) extrapolated to momentum transfer q 2 = 0, shows a large scatter. proton charge radius, examine the status of the PRP, potential solutions, and the experiments planned to resolve it. The rms-radius R of the proton charge distribution is a fundamental quantity needed for precision physics.
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