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The size of the proton From the Lamb-shift in muonic hydrogen

Nebel, Tobias and Antognini, Aldo and Hänsch, Theodor and Pohl, Randolf and Amaro, Fernando and Cardoso, Joao and Fernandes, Luis and Lopes, Jose and Monteiro, Christina and dos Santos, Joaquim and Biraben, Francois and Indelicato, Paul and Julien, Lucile and Le Bigot, Eric and Nez, Francois and Schwob, Catherine and Covita, Daniel and Veloso, Joao and Dax, Andreas and Dhawan, Satish and Giesen, Adolf and Schuhmann, Kartsen and Graf, Thomas and Kao, Cheng-Yang and Liu, Yi-Wei and Knowles, Paul and Ludhova, Livia and Mulhauser, Francoise and Schaller, Lukas and Kottmann, Franz and Rabinowitz, Paul and Taqqu, David (2011) The size of the proton From the Lamb-shift in muonic hydrogen. Springer Science+Business Media. European Quantum Electronics Conference, München, Germany. DOI: 10.1007/s10751-011-0386-5

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Abstract

The root-mean-square (rms) charge radius r_p of the proton has so far been known only with a surprisingly low precision of about 1% from both electron scattering and precision spectroscopy of hydrogen. We have recently determined r_p by means of laser spectroscopy of the Lamb shift in the exotic “muonic hydrogen” atom. Here, the muon, which is the 200 times heavier cousin of the electron, orbits the proton with a 200 times smaller Bohr radius. This enhances the sensitivity to the proton’s finite size tremendously. Our new value r_p = 0.84184 (67) fm is ten times more precise than the generally accepted CODATA-value, but it differs by 5 standard deviations from it. A lively discussion about possible solutions to the “proton size puzzle” has started. Our measurement, together with precise measurements of the 1S–2S transition in regular hydrogen and deuterium, also yields improved values of the Rydberg constant, R_∞ = 10,973,731.568160 (16) m^−1.

Item URL in elib:https://elib.dlr.de/81088/
Document Type:Conference or Workshop Item (Speech)
Title:The size of the proton From the Lamb-shift in muonic hydrogen
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Nebel, TobiasMax Plank Institut für QuantenoptikUNSPECIFIED
Antognini, AldoMax Plank Institut für QuantenoptikUNSPECIFIED
Hänsch, TheodorMax Plank Institut für QuantenoptikUNSPECIFIED
Pohl, RandolfMax Plank Institut für QuantenoptikUNSPECIFIED
Amaro, FernandoUniversidade de CoimbraUNSPECIFIED
Cardoso, JoaoUniversidade de CoimbraUNSPECIFIED
Fernandes, LuisUniversidade de CoimbraUNSPECIFIED
Lopes, JoseUniversidade de CoimbraUNSPECIFIED
Monteiro, ChristinaUniversidade de CoimbraUNSPECIFIED
dos Santos, JoaquimUniversidade de CoimbraUNSPECIFIED
Biraben, FrancoisLaboratoire Kastler BrosselUNSPECIFIED
Indelicato, PaulLaboratoire Kastler BrosselUNSPECIFIED
Julien, LucileLaboratoire Kastler BrosselUNSPECIFIED
Le Bigot, EricLaboratoire Kastler BrosselUNSPECIFIED
Nez, FrancoisLaboratoire Kastler BrosselUNSPECIFIED
Schwob, CatherineLaboratoire Kastler BrosselUNSPECIFIED
Covita, DanielUniveristy of Aveiro, PortugalUNSPECIFIED
Veloso, JoaoUniveristy of Aveiro, PortugalUNSPECIFIED
Dax, AndreasYale UniversityUNSPECIFIED
Dhawan, SatishYale UniversityUNSPECIFIED
Giesen, Adolfadolf.giesen (at) dlr.deUNSPECIFIED
Schuhmann, KartsenDausinger & Giesen GmbHUNSPECIFIED
Graf, ThomasInstitut für StrahlwerkzeugeUNSPECIFIED
Kao, Cheng-YangNational Tsing Hua UniversityUNSPECIFIED
Liu, Yi-WeiNational Tsing Hua UniversityUNSPECIFIED
Knowles, PaulUniversity de FribourgUNSPECIFIED
Ludhova, LiviaUniversity de FribourgUNSPECIFIED
Mulhauser, FrancoiseUniversity de FribourgUNSPECIFIED
Schaller, LukasUniversity de FribourgUNSPECIFIED
Kottmann, FranzInstitut für Teilchenphysik, ETH ZürichUNSPECIFIED
Rabinowitz, PaulPrinceton UniversityUNSPECIFIED
Taqqu, DavidPaul Scherrer InstituteUNSPECIFIED
Date:May 2011
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:2012
DOI :10.1007/s10751-011-0386-5
Publisher:Springer Science+Business Media
Status:Published
Keywords:Muonic hydrogen, Lamb shift, Laser spectroscopy, Proton charge radius
Event Title:European Quantum Electronics Conference
Event Location:München, Germany
Event Type:international Conference
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research (old)
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Laser Research and Technology (old)
Location: Stuttgart
Institutes and Institutions:Institute of Technical Physics
Deposited By: Haupts, Melanie Sabrina
Deposited On:20 Mar 2013 11:39
Last Modified:20 Mar 2013 11:39

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