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The Lamb shift in muonic hydrogen
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The Lamb shift in muonic hydrogen

Randolf Pohl, Aldo Antognini, Franois Nez, Fernando D. Amaro, François Biraben, João M. R. Cardoso, Daniel S. Covita, Andreas Dax, Satish Dhawan, Luis M. P. Fernandes, …
Canadian Journal of Physics, 卷.89(1), 頁碼.37-45
01/2011
DOI: https://doi.org/10.1139/P10-109

摘要

Physics and Astronomy (all)
The long quest for a measurement of the Lamb shift in muonic hydrogen is over. Last year we measured the energy splitting (Pohl et al., Nature, 466, 213 (2010)) in p with an experimental accuracy of 15 ppm, twice better than our proposed goal. Using current QED calculations of the fine, hyperfine, QED, and finite size contributions, we obtain a root-mean-square proton charge radius of r p =0.84184(67) fm. This value is 10 times more precise, but 5 standard deviations smaller, than the 2006 CODATA value of r p . The origin of this discrepancy is not known. Our measurement, together with precise measurements of the 1S-2S transition in regular hydrogen and deuterium, gives improved values of the Rydberg constant, R ∞ =10973731.568160(16) m-1 and the rms charge radius of the deuteron r d =2.12809(31) fm.

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