11 January 2011 Muonic hydrogen spectroscopy: the proton radius puzzle
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Proceedings Volume 7993, ICONO 2010: International Conference on Coherent and Nonlinear Optics; 79931K (2011) https://doi.org/10.1117/12.881629
Event: International Conference on Coherent and Nonlinear Optics (ICONO 2010) and International Conference on Lasers, Applications and Technologies (LAT 2010), 2010, Kazan, Russian Federation
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.
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Aldo Antognini, Aldo Antognini, François Nez, François Nez, Fernando D. Amaro, Fernando D. Amaro, François Biraben, François Biraben, João M. R. Cardoso, João M. R. Cardoso, Daniel S. Covita, Daniel S. Covita, Andreas Dax, Andreas Dax, Satish Dhawan, Satish Dhawan, Luis M. P. Fernandes, Luis M. P. Fernandes, Adolf Giesen, Adolf Giesen, Thomas Graf, Thomas Graf, Theodor W. Hänsch, Theodor W. Hänsch, Paul Indelicato, Paul Indelicato, Lucile Julien, Lucile Julien, Cheng-Yang Kao, Cheng-Yang Kao, Paul Knowles, Paul Knowles, Franz Kottmann, Franz Kottmann, Eric-Olivier Le Bigot, Eric-Olivier Le Bigot, Yi-Wei Liu, Yi-Wei Liu, José A. M. Lopes, José A. M. Lopes, Livia Ludhova, Livia Ludhova, Cristina M. B. Monteiro, Cristina M. B. Monteiro, Françoise Mulhauser, Françoise Mulhauser, Tobias Nebel, Tobias Nebel, Paul Rabinowitz, Paul Rabinowitz, Joaquim M. F. dos Santos, Joaquim M. F. dos Santos, Lukas A. Schaller, Lukas A. Schaller, Karsten Schuhmann, Karsten Schuhmann, Catherine Schwob, Catherine Schwob, David Taqqu, David Taqqu, João F. C. A. Veloso, João F. C. A. Veloso, Randolf Pohl, Randolf Pohl, } "Muonic hydrogen spectroscopy: the proton radius puzzle", Proc. SPIE 7993, ICONO 2010: International Conference on Coherent and Nonlinear Optics, 79931K (11 January 2011); doi: 10.1117/12.881629; https://doi.org/10.1117/12.881629

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