The radius of the proton: Size does matter

Jonathan D. Carroll, Anthony W. Thomas, Johann Rafelski, Gerald A. Miller

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations


The measurement by Pohl et al. [1] of the 2S1/2F=1 to 2P3/2F=2 transition in muonic hydrogen and the subsequent analysis has led to a conclusion that the rms charge radius of the proton differs from the accepted (CODATA [2]) value by approximately 4%, leading to a 4.9σ discrepancy. We investigate the muonic hydrogen spectrum relevant to this transition using bound-state QED with Dirac wave-functions and comment on the extent to which the perturbation-theory analysis which leads to the above conclusion can be confirmed.

Original languageEnglish (US)
Title of host publicationT(r)opical QCD 2010
Number of pages7
StatePublished - 2011
EventT(r)opical QCD 2010 - Cairns, QLD, Australia
Duration: Sep 26 2010Oct 1 2010

Publication series

NameAIP Conference Proceedings
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616


OtherT(r)opical QCD 2010
CityCairns, QLD


  • QED
  • lamb shift
  • proton radius

ASJC Scopus subject areas

  • Physics and Astronomy(all)


Dive into the research topics of 'The radius of the proton: Size does matter'. Together they form a unique fingerprint.

Cite this