Proton Structure from the Measurement of 2S-2P Transition Frequencies of Muonic Hydrogen

  title={Proton Structure from the Measurement of 2S-2P Transition Frequencies of Muonic Hydrogen},
  author={Aldo Antognini and François Nez and Karsten Schuhmann and Fernando Domingues Amaro and Francois Biraben and Jo{\~a}o M. R. Cardoso and Daniel S. Covita and Andreas J Dax and S. K. Dhawan and Marc Diepold and Luis M P Fernandes and Adolf Giesen and Andrea L. Gouvea and Thomas Graf and Theodor W. H{\"a}nsch and Paul Indelicato and Lucile Julien and Cheng-Yang Kao and Paul E. Knowles and Franz Kottmann and E-O Le Bigot and Yi-Wei Liu and Jos{\'e} A. M. Lopes and Livia Ludhova and Cristina Maria Bernardes Monteiro and Françoise Mulhauser and Tobias Nebel and Paul Rabinowitz and Joaquim Marques Ferreira dos Santos and Lukas A. Schaller and Catherine Schwob and David Taqqu and Jo{\~a}o Veloso and Jan Vogelsang and Randolf Pohl},
  pages={417 - 420}
Proton Still Too Small Despite a proton's tiny size, it is possible to measure its radius based on its charge or magnetization distributions. Traditional measurements of proton radius were based on the scattering between protons and electrons. Recently, a precision measurement of a line in the spectrum of muonium—an atom consisting of a proton and a muon, instead of an electron—revealed a radius inconsistent with that deduced from scattering studies. Antognini et al. (p. 417; see the… 

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