The proton radius puzzle
Aldo Antognini
(1, 2)
,
Randolf Pohl
(1)
,
Fernando D. Amaro
(3)
,
François Biraben
(4)
,
Joao M. R. M. R. Cardoso
(3)
,
Daniel S. Covita
(5)
,
Andreas Dax
(6)
,
Satish Dhawan
(6)
,
Luis M. P. Fernandes
(3)
,
Adolf Giesen
(7)
,
Thomas Graf
(8)
,
Theodor W. Hänsch
(1)
,
Paul Indelicato
(4)
,
Lucile Julien
(4)
,
Cheng-Yang Kao
(9)
,
Paul Knowles
(10)
,
Franz Kottmann
(2)
,
Eric-Olivier Le Bigot
(4)
,
Yi-Wei Liu
(9)
,
José A. M. Lopes
(3)
,
Livia Ludhova
(10)
,
Cristina M. B. Monteiro
(3)
,
Françoise Mulhauser
(10)
,
Tobias Nebel
(1)
,
François Nez
(4)
,
Paul Rabinowitz
(11)
,
Joaquim M. F. dos Santos
(3)
,
Lukas A. Schaller
(10)
,
Karsten Schuhmann
(7)
,
Catherine Schwob
(4)
,
David Taqqu
(12)
,
Joao F. C. A. Veloso
(3, 5)
1
MPQ -
Max-Planck-Institut für Quantenoptik
2 Institut f¨ur Particle Physics
3 DFC - Departamento de Física [Coimbra]
4 LKB (Jussieu) - Laboratoire Kastler Brossel
5 Departamento de Fisica [Aveiro]
6 Physics Department
7 Dausinger & Giesen Gmbh
8 IFSW - Institut für Strahwerkzeuge
9 Physics Department
10 departement de physique
11 Department of Chemistry
12 PSI - Paul Scherrer Institute
2 Institut f¨ur Particle Physics
3 DFC - Departamento de Física [Coimbra]
4 LKB (Jussieu) - Laboratoire Kastler Brossel
5 Departamento de Fisica [Aveiro]
6 Physics Department
7 Dausinger & Giesen Gmbh
8 IFSW - Institut für Strahwerkzeuge
9 Physics Department
10 departement de physique
11 Department of Chemistry
12 PSI - Paul Scherrer Institute
Aldo Antognini
- Fonction : Auteur
Paul Indelicato
- Fonction : Auteur
- PersonId : 17063
- IdHAL : paul-indelicato
- ORCID : 0000-0003-4668-8958
- IdRef : 083262369
François Nez
- Fonction : Auteur
- PersonId : 739031
- IdHAL : francois-nez
- ORCID : 0000-0002-3478-7521
- IdRef : 161272991
Résumé
By means of pulsed laser spectroscopy applied to muonic hydrogen (mu(-)p) we have measured the 2S(1/2)(F=1) - 2P(3/2)(F=2) transition frequency to be 49881.88(76) GHz [1]. By comparing this measurement with its theoretical prediction [2, 3, 4, 5, 6, 7] based on bound-state QED we have determined a proton radius value of r(p) = 0.84184(67) fm. This new value differs by 5.0 standard deviations from the CODATA value of 0.8768(69) fm [8], and 3 standard deviation from the e-p scattering results of 0.897(18) fm [9]. The observed discrepancy may arise from a computational mistake of the energy levels in mu p or H, or a fundamental problem in bound-state QED, an unknown effect related to the proton or the muon, or an experimental error.