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The RMS Charge Radius of the Proton and Zemach Moments · Around

2010

The RMS Charge Radius of the Proton and Zemach Moments

Distler, Michael O., Bernauer, Jan C., Walcher, Thomas

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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.

Built on

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A. De Rujula, arXiv:1010.3421 [hep-ph]

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I. C. Cloet and G. A. Miller, arXiv:1008.4345 [hep-ph]

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A. De Rujula, arXiv:1008.4546 [hep-ph]

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U. D. Jentschura, Eur. Phys. J. D, [doi:10.1140/epjd/e2010-10414-6] [arXiv:1012.4029 [physics.atom-ph]]

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M. Vanderhaeghen and T. Walcher, accepted for publication in Nuclear Physics News [arXiv:1008.4225 [hep-ph]]

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