Nuclear Quasi-Elastic Electron Scattering Limits Nucleon Off-Mass Shell Properties

Abstract

The use of quasi-elastic electron nucleus scattering is shown to provide significant constraints on models of the proton electromagnetic form factor of off-shell nucleons. Such models can be constructed to be consistent with constraints from current conservation and low-energy theorems, while also providing a contribution to the Lamb shift that might potentially resolve the proton radius puzzle in muonic hydrogen. However, observations of quasi-elastic scattering limit the overall strength of the off-shell form factors to values that correspond to small contributions to the Lamb shift.

11 pages, 2 figures. Resubmission to improve the clarity, and correct possible misconceptions

References in corpus (11)

• Muonic hydrogen and MeV forces
• New Parity-Violating Muonic Forces
• Proton polarisability contribution to the Lamb shift in muonic hydrogen at fourth order in chiral perturbation theory
• Proton size anomaly
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• Atomic Precision Tests and Light Scalar Couplings
• QED is not endangered by the proton's size
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• Third Zemach Moment of the Proton

Cited by in corpus (6)

• Muonic hydrogen and the proton radius puzzle
• Model independent extraction of the proton magnetic radius from electron scattering
• Electrophobic Scalar Boson and Muonic Puzzles
• $\mu -H$ Lamb shift: dispersing the nucleon-excitation uncertainty with a finite energy sum rule
• Nonidentical protons
• Eta Decay and Muonic Puzzles