The Lamb shift in muonic hydrogen
Randolf Pohl
(1)
,
Aldo Antognini
(1)
,
François Nez
(2)
,
Fernando D. Amaro
(3)
,
François Biraben
(2)
,
Joao M.R. Cardoso
(3)
,
Daniel S. Covita
(3)
,
Andreas Dax
(4)
,
Satish Dhawan
(4)
,
Luis M.P. Fernandes
(3)
,
Adolf Giesen
(5)
,
Thomas Graf
(6)
,
Theodor W. Hänsch
,
Paul Indelicato
(2)
,
Lucile Julien
(2)
,
Cheng-Yang Kao
(7)
,
Paul Knowles
(8)
,
Eric-Olivier Le Bigot
(2)
,
Yi-Wei Liu
(7)
,
José A.M. Lopes
(3)
,
Livia Ludhova
(8)
,
Cristina M.B. Monteiro
(3)
,
Françoise Mulhauser
(8)
,
Tobias Nebel
(1)
,
Paul Rabinowitz
(9)
,
Joaquim M.F. dos Santos
(3)
,
Lukas A. Schaller
(8)
,
Karsten Schuhmann
(5)
,
Catherine Schwob
(2)
,
David Taqqu
(10)
,
Joao F.C.A. Veloso
(3)
,
Franz Kottmann
(10)
1
MPQ -
Max-Planck-Institut für Quantenoptik
2 LKB (Jussieu) - Laboratoire Kastler Brossel
3 DFC - Departamento de Física [Coimbra]
4 Physics Department
5 Technol Gesell Strahlwerkzeuge
6 IFSW - Institut für Strahwerkzeuge
7 Physics Department
8 dpuf - Département de Physique
9 Department of Chemistry
10 PSI - Paul Scherrer Institute
2 LKB (Jussieu) - Laboratoire Kastler Brossel
3 DFC - Departamento de Física [Coimbra]
4 Physics Department
5 Technol Gesell Strahlwerkzeuge
6 IFSW - Institut für Strahwerkzeuge
7 Physics Department
8 dpuf - Département de Physique
9 Department of Chemistry
10 PSI - Paul Scherrer Institute
François Nez
- Fonction : Auteur
- PersonId : 739031
- IdHAL : francois-nez
- ORCID : 0000-0002-3478-7521
- IdRef : 161272991
Theodor W. Hänsch
- Fonction : Auteur
Paul Indelicato
- Fonction : Auteur
- PersonId : 17063
- IdHAL : paul-indelicato
- ORCID : 0000-0003-4668-8958
- IdRef : 083262369
Résumé
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 mu 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) = 0.841 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(infinity) = 10 973 731.568 160 (16) m(-1) and the rms charge radius of the deuteron r(d) = 2.128 09 (31) fm.