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Antognini, A; Amaro, F D; Biraben, F; Cardoso, J M R; Covita, D S; Dax, A; Dhawan, S; Fernandes, L M P; Giesen, A; Graf, T; Hänsch, T W; Indelicato, P; Julien, L; Kao, C -Y; Knowles, P; Kottmann, F; Bigot, E -O Le; Liu, Y -W; Lopes, J A M; Ludhova, L; Monteiro, C M B; Mulhauser, F; Nebel, T; Nez, F; Rabinowitz, P; Santos, J M F dos; Schaller, L A; Schuhmann, K; Schwob, C; Taqqu, D; Veloso, J F C A; Pohl, R
Journal of Physics: Conference Series, 09/2011, Letnik: 312, Številka: 3Journal Article, Conference Proceeding
By means of pulsed laser spectroscopy applied to muonic hydrogen (μ− p) we have measured the 2SF 11/2 – 2PF 23/2 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 rp 0.84184(67) fm. This new value differs by 5.0 standard deviations from the COD ATA 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.
