Proton Radius, Darwin-Foldy Term and Radiative Corrections

Details Proton Radius, Darwin-Foldy Term and Radiative Corrections Proton Radius, Darwin-Foldy Term and Radiative Corrections

2010-12-17

arxiv.org/abs/1012.4029v1

Eur.Phys.J.D61:7-14,2011

Physics

Atomic Physics

8 pages, LaTeX, EPJD style

Scientific paper

10.1140/epjd/e2010-10414-6

We discuss the role of the so-called Darwin-Foldy term in the evaluation of the proton and deuteron charge radii from atomic hydrogen spectroscopy and nuclear scattering data. The question of whether this term should be included or excluded from the nuclear radius has been controversially discussed in the literature. We attempt to clarify which literature values correspond to which conventions. A detailed discussion of the conventions appears useful because a recent experiment [R. Pohl et al., Nature vol. 466, p. 213 (2010)] has indicated that there is a discrepancy between the proton charge radii inferred from ordinary ("electronic") atomic hydrogen and muonic hydrogen. We also investigate the role of quantum electrodynamic radiative corrections in the determination of nuclear radii from scattering data, and propose a definition of the nuclear self energy which is compatible with the subtraction of the radiative corrections in scattering experiments.

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