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  • The Lamb shift in muonic hy...
    Pohl, Randolf; Antognini, Aldo; Nez, François; Amaro, Fernando D; Biraben, François; Cardoso, João M.R; Covita, Daniel S; Dax, Andreas; Dhawan, Satish; Fernandes, Luis M.P; Giesen, Adolf; Graf, Thomas; Hänsch, Theodor W; Indelicato, Paul; Julien, Lucile; Kao, Cheng-Yang; Knowles, Paul; Le Bigot, Eric-Olivier; Liu, Yi-Wei; Lopes, José A.M; Ludhova, Livia; Monteiro, Cristina M.B; Mulhauser, Françoise; Nebel, Tobias; Rabinowitz, Paul; dos Santos, Joaquim M.F; Schaller, Lukas A; Schuhmann, Karsten; Schwob, Catherine; Taqqu, David; Veloso, João F.C.A; Kottmann, Franz

    Canadian journal of physics, 01/2011, Letnik: 89, Številka: 1
    Journal Article

    The long quest for a measurement of the Lamb shift in muonic hydrogen is over. Last year we measured the 2S 1/2 F=1 -2P 3/2 F=2 energy splitting (Pohl et al., Nature, 466 , 213 (2010)) in μp 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  = 0.841 84 (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 ∞  = 10 973 731.568 160 (16) m -1 and the rms charge radius of the deuteron r d  = 2.128 09 (31) fm.