giftsclub.blogg.se

1. PROTON CHARGE RADIUS FROM ELECTRON SCATTERING PDF
2. PROTON CHARGE RADIUS FROM ELECTRON SCATTERING FREE

Then, we discuss the implications of these new constraints on the proton radius puzzle. The scattering of electrons from nuclei has given us the most precise information about nuclear size and charge distribution. It can be measured by the scattering of electrons by the nucleus. The proton radius is approximately one femtometre 10 metres. Based on the spectroscopic data of muonic helium, we find constraints for the effective energy scale of the radion as a function of the alpha particle radius. The rms charge radius is a measure of the size of an atomic nucleus, particularly the proton distribution. Elastic electron-proton scattering (e-p) and the spectroscopy of hydrogen atoms are the two methods traditionally used to determine the proton charge radius, r p. Moreover, as some stabilization mechanism acts exclusively on the scalar degree of freedom, the tensor and scalar fields should be treated as phenomenologically independent quantities. The radion field is related to fluctuations of the volume of the supplementary space, and, in comparison with the tensorial degrees of freedom, it couples to matter in a different way. Today, more than a decade after this puzzle began, new determinations of the proton radius are available that corroborate the results from measurements with. Specifically, we calculate the influence of the radion, the scalar degree of freedom of the higher-dimensional gravity, on the energy difference between the 2S and 2P levels of this exotic atom.

PROTON CHARGE RADIUS FROM ELECTRON SCATTERING PDF

The electric charge radius of a proton, denoted by rEp, characterizes the spatial distribution of its Expand 1 PDF THE QUEST FOR THE PROTON CHARGE RADIUS I. In this paper, we analyze the new data in the context of large extra-dimensional theories. Physics Universe 2023 A proton is a bound state of a strong interaction, governed by Quantum Chromodynamics (QCD).

PROTON CHARGE RADIUS FROM ELECTRON SCATTERING FREE

Thus, the new spectroscopic data put additional empiric bounds on some free parameters of certain physics theories beyond the Standard Model. The value found is compatible with the radius extracted from the analysis of the electron-helium scattering.

Recent measurements of the Lamb shift of muonic helium-4 ions were used to infer the alpha particle charge radius. The value rp 0.84087(39) fm extracted from muonic hydrogen spectroscopy is about 4 smaller than that obtained from e-p scattering or standard hydrogen.