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Proceedings Article

Muonic hydrogen spectroscopy: the proton radius puzzle

[+] Author Affiliations
Aldo Antognini

Max-Planck-Institut für Quantenoptik (Germany) and ETH Zürich (Switzerland)

François Nez, François Biraben, Paul Indelicato, Lucile Julien, Eric-Olivier Le Bigot, Catherine Schwob

Lab. Kastler Brossel, École Normale Supérieure, CNRS (France) and Univ. Pierre et Marie Curie (France)

Fernando D. Amaro, João M. R. Cardoso, Luis M. P. Fernandes, José A. M. Lopes, Cristina M. B. Monteiro, Joaquim M. F. dos Santos

Univ. de Coimbra (Portugal)

Daniel S. Covita

Univ. de Coimbra (Portugal) and Univ. de Aveiro (Portugal)

Andreas Dax, Satish Dhawan

Yale Univ. (USA)

Adolf Giesen, Karsten Schuhmann

Dausinger & Giesen GmbH (Germany)

Thomas Graf

Univ. Stuttgart (Germany)

Theodor W. Hänsch

Max-Planck-Institut für Quantenoptik (Germany) and Ludwig-Maximilians-Univ. München (Germany)

Cheng-Yang Kao, Yi-Wei Liu

National Tsing Hua Univ. (Taiwan)

Paul Knowles, Livia Ludhova, Françoise Mulhauser, Lukas A. Schaller

Univ. de Fribourg (Switzerland)

Franz Kottmann

ETH Zürich (Switzerland)

Tobias Nebel, Randolf Pohl

Max-Planck-Institut für Quantenoptik (Germany)

Paul Rabinowitz

Princeton Univ. (USA)

David Taqqu

Paul Scherrer Institut (Switzerland)

João F. C. A. Veloso

Univ. de Aveiro (Portugal)

Proc. SPIE 7993, ICONO 2010: International Conference on Coherent and Nonlinear Optics, 79931K (January 11, 2011); doi:10.1117/12.881629
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From Conference Volume 7993

  • ICONO 2010: International Conference on Coherent and Nonlinear Optics
  • Kazan, Russian Federation | August 23, 2010

abstract

By means of pulsed laser spectroscopy applied to muonic hydrogen (μ¯p) we havemeasured the 2S (F=1)/(1/2) - 2P(F=2)/(3/2) transition frequency to be 49881.88(76)GHz.1 By comparing this measurement with its theoretical prediction 2-7 based on bound-state QED we have determined a proton radius value of rP =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 μp or H, or a fundamental problem in bound-state QED, an unknown effect related to the proton or the muon, or an experimental error.

© (2010) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Aldo Antognini ; François Nez ; Fernando D. Amaro ; François Biraben ; João M. R. Cardoso, et al.
"Muonic hydrogen spectroscopy: the proton radius puzzle", Proc. SPIE 7993, ICONO 2010: International Conference on Coherent and Nonlinear Optics, 79931K (January 11, 2011); doi:10.1117/12.881629; http://dx.doi.org/10.1117/12.881629


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