Heidelberg 2015 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 72: Precision Spectroscopy of Atoms and Ions IV (with A)

Q 72.4: Talk

Friday, March 27, 2015, 11:45–12:00, C/kHS

Current status of the Proton Radius Puzzle — •Julian J. Krauth and the CREMA Collaboration — Max-Planck-Institute of Quantum Optics, Garching

This talk gives an overview on the current status of the Proton Radius Puzzle.

In 2009 the CREMA Collaboration provided a measurement of the rms charge radius of the proton via the 2S-2P Lamb shift in muonic hydrogen. It is particularly remarcable that the proton radius is found to be 4% smaller than indicated by previous experiments using electronic hydrogen or electron scattering. The radius measured by the CREMA Collaboration has a 7σ discrepancy with respect to the 2010 CODATA value which is composed by the mentioned previous experiments. The so-called Proton Radius Puzzle has caused a huge debate in the scientific community but remains unsolved up to this date. In order to shed light on the puzzle we recently performed 2S-2P Lamb shift measurements with muonic helium.