The RMS Charge Radius of the Proton and Zemach Moments

Details The RMS Charge Radius of the Proton and Zemach Moments The RMS Charge Radius of the Proton and Zemach Moments

2010-11-08

arxiv.org/abs/1011.1861v3

Phys. Lett.B696:343-347,2011

Physics

Nuclear Physics

Nuclear Theory

6 pages, 4 figures, final version includes discussion of systematic and numerical errors

Scientific paper

10.1016/j.physletb.2010.12.067

On the basis of recent precise measurements of the electric form factor of the proton, the Zemach moments, needed as input parameters for the determination of the proton rms radius from the measurement of the Lamb shift in muonic hydrogen, are calculated. It turns out that the new moments give an uncertainty as large as the presently stated error of the recent Lamb shift measurement of Pohl et al.. De Rujula's idea of a large Zemach moment in order to reconcile the five standard deviation discrepancy between the muonic Lamb shift determination and the result of electronic experiments is shown to be in clear contradiction with experiment. Alternative explanations are touched upon.

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