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QED is not endangered by the proton's size
Authors:A De Rújula
Institution:1. Instituto de Física Teórica, Universidad Autónoma de Madrid (UAM/CSIC), Madrid, Spain;2. CIEMAT, Madrid, Spain;3. Physics Department, Boston University, Boston, MA 02215, United States;4. Physics Department, CERN, CH 1211, Geneva 23, Switzerland
Abstract:Pohl et al. have reported a very precise measurement of the Lamb-shift in muonic hydrogen (Pohl et al., 2010) 1], 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 (Pohl et al., 2010) 1] 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 1013, as well as putative evidence for physics beyond the standard model (Flowers, 2010) 2]. I demonstrate that these options are unsubstantiated.
Keywords:Proton radius  Lyman shift  Muonic hydrogen
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