Understand
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.
Built on
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M. I. Eides, H. Grotch & V. A. Shelyuto, Springer Tracts in Mod. Phys. 222
2005
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P. G. Blunden, & I. Sick, Phys. Rev. C72
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J. L. Friar & I. Sick Phys. Rev. A72
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J. Flowers “News and Views” on Pohl , ibid
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J. J. Balmer, Verhandlungen der Naturforschenden Gesellschaft in Basel 7
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R. Pohl, et al
2010
Closest in time.
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