Université de Fribourg

The Lamb shift in muonic hydrogen and the proton radius

Antognini, Aldo ; Pohl, R. ; Amaro, F.D. ; Biraben, François ; Cardoso, J.M.R. ; Covita, D.S. ; Dax, Andreas ; Dhawan, Satish ; Fernandes, L.M.P. ; Giesen, Adolf ; Gouvea, A.L. ; Graf, Thomas ; Hänsch, T.W. ; Hildebrandt, M. ; Indelicato, Paul ; Julien, L. ; Kao, Cheng-Yang ; Kirch, K. ; Knowles, Paul E. ; Bigot, Eric-Olivier Le ; Liu, Yi-Wei ; Lopes, J.A.M. ; Ludhova, Lidia ; Monteiro, C.M.B. ; Mulhauser, Françoise ; Nebel, Tobias ; Nez, François ; Rabinowitz, Paul ; Santos, J.M.F. dos ; Schaller, Lukas A. ; Schuhmann, Karsten ; Schwob, Catherine ; Taqqu, D. ; Veloso, J.F.C.A. ; Voss, A. ; Kottmann, Franz

In: Physics Procedia, 2011, vol. 17, p. 10-19

By means of pulsed laser spectroscopy applied to muonic hydrogen (μ− p) we have measured the 2S F = 1 1/2 − 2PF = 2 3/2 transition frequency to be 49881.88(76) GHz. By comparing this measurement with its theoretical prediction based on bound-state QED we have determined a proton radius value of rp = 0.84184 (67) fm. This new value is an order of magnitude preciser than previous results but...