Third Zemach Moment of the Proton

Abstract

Modern electron scattering experiments have determined the proton electric form factor, G_{Ep}(Q^2), to high precision. We utilize this data, represented by the different form factor parametrizations, to compute the third Zemach moment of the proton charge distribution. We find that existing data rule out a value of the third Zemach moment large enough to explain the current puzzle with the proton charge radius determined from the Lamb shift in muonic hydrogen. This is in contrast with the recent claim of De Rujula [arXiv:1008.3861].

3 pages, three figures

References in corpus (4)

• Nucleon Electromagnetic Form Factors
• Global analysis of proton elastic form factor data with two-photon exchange corrections
• Electromagnetic form factors of the nucleon: new fit and analysis of uncertainties
• QED is not endangered by the proton's size

Cited by in corpus (1)

• The RMS Charge Radius of the Proton and Zemach Moments