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arxiv: 1008.3861 · v3 · pith:F7FKI7OZnew · submitted 2010-08-23 · ✦ hep-ph · hep-ex· physics.atom-ph

QED is not endangered by the proton's size

classification ✦ hep-ph hep-exphysics.atom-ph
keywords preciseprotonstandardawaybeenbeyondcharacterizingcharge
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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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