QED is not endangered by the proton's size

Details QED is not endangered by the proton's size QED is not endangered by the proton's size

2010-08-23

arxiv.org/abs/1008.3861v3

Phys.Lett.B693:555-558,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

Modified following comments in arXiv:1008.4345v1. 4 pages, 2 figures

Scientific paper

10.1016/j.physletb.2010.08.074

Pohl et al. have reported a very precise measurement of the Lamb-shift in muonic Hydrogen, from which they infer the radius characterizing the proton's charge distribution. The result is 5 standard deviations away from the one of the CODATA compilation of physical constants. This has been interpreted as possibly requiring a 4.9 standard-deviation modification of the Rydberg constant, to a new value that would be precise to 3.3 parts in $10^{13}$, as well as putative evidence for physics beyond the standard model. I demonstrate that these options are unsubstantiated.

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