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Proceedings Paper

Muonic hydrogen spectroscopy: the proton radius puzzle
Author(s): Aldo Antognini; François Nez; Fernando D. Amaro; François Biraben; João M. R. Cardoso; Daniel S. Covita; Andreas Dax; Satish Dhawan; Luis M. P. Fernandes; Adolf Giesen; Thomas Graf; Theodor W. Hänsch; Paul Indelicato; Lucile Julien; Cheng-Yang Kao; Paul Knowles; Franz Kottmann; Eric-Olivier Le Bigot; Yi-Wei Liu; José A. M. Lopes; Livia Ludhova; Cristina M. B. Monteiro; Françoise Mulhauser; Tobias Nebel; Paul Rabinowitz; Joaquim M. F. dos Santos; Lukas A. Schaller; Karsten Schuhmann; Catherine Schwob; David Taqqu; João F. C. A. Veloso; Randolf Pohl
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Paper 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.

Paper Details

Date Published: 11 January 2011
PDF: 10 pages
Proc. SPIE 7993, ICONO 2010: International Conference on Coherent and Nonlinear Optics, 79931K (11 January 2011); doi: 10.1117/12.881629
Show Author Affiliations
Aldo Antognini, Max-Planck-Institut für Quantenoptik (Germany)
ETH Zürich (Switzerland)
François Nez, Lab. Kastler Brossel, École Normale Supérieure, CNRS (France)
Univ. Pierre et Marie Curie (France)
Fernando D. Amaro, Univ. de Coimbra (Portugal)
François Biraben, Lab. Kastler Brossel, École Normale Supérieure, CNRS (France)
Univ. Pierre et Marie Curie (France)
João M. R. Cardoso, Univ. de Coimbra (Portugal)
Daniel S. Covita, Univ. de Coimbra (Portugal)
Univ. de Aveiro (Portugal)
Andreas Dax, Yale Univ. (United States)
Satish Dhawan, Yale Univ. (United States)
Luis M. P. Fernandes, Univ. de Coimbra (Portugal)
Adolf Giesen, Dausinger & Giesen GmbH (Germany)
Thomas Graf, Univ. Stuttgart (Germany)
Theodor W. Hänsch, Max-Planck-Institut für Quantenoptik (Germany)
Ludwig-Maximilians-Univ. München (Germany)
Paul Indelicato, Lab. Kastler Brossel, École Normale Supérieure, CNRS (France)
Univ. Pierre et Marie Curie (France)
Lucile Julien, Lab. Kastler Brossel, École Normale Supérieure, CNRS (France)
Univ. Pierre et Marie Curie (France)
Cheng-Yang Kao, National Tsing Hua Univ. (Taiwan)
Paul Knowles, Univ. de Fribourg (Switzerland)
Franz Kottmann, ETH Zürich (Switzerland)
Eric-Olivier Le Bigot, Lab. Kastler Brossel, École Normale Supérieure, CNRS (France)
Univ. Pierre et Marie Curie (France)
Yi-Wei Liu, National Tsing Hua Univ. (Taiwan)
José A. M. Lopes, Univ. de Coimbra (Portugal)
Livia Ludhova, Univ. de Fribourg (Switzerland)
Cristina M. B. Monteiro, Univ. de Coimbra (Portugal)
Françoise Mulhauser, Univ. de Fribourg (Switzerland)
Tobias Nebel, Max-Planck-Institut für Quantenoptik (Germany)
Paul Rabinowitz, Princeton Univ. (United States)
Joaquim M. F. dos Santos, Univ. de Coimbra (Portugal)
Lukas A. Schaller, Univ. de Fribourg (Switzerland)
Karsten Schuhmann, Dausinger & Giesen GmbH (Germany)
Catherine Schwob, Lab. Kastler Brossel, École Normale Supérieure, CNRS (France)
Univ. Pierre et Marie Curie (France)
David Taqqu, Paul Scherrer Institut (Switzerland)
João F. C. A. Veloso, Univ. de Aveiro (Portugal)
Randolf Pohl, Max-Planck-Institut für Quantenoptik (Germany)


Published in SPIE Proceedings Vol. 7993:
ICONO 2010: International Conference on Coherent and Nonlinear Optics
Claude Fabre; Victor Zadkov; Konstantin Drabovich, Editor(s)

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