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A: Fachverband Atomphysik

A 2: Precision spectroscopy of atoms and ions I (with Q)

A 2.2: Talk

Monday, March 18, 2013, 11:15–11:30, B 302

Myonic hydrogen and the proton radius puzzle — •Randolf Pohl — Max-Planck-Institut für Quantenoptik, Garching

Our recent measurement of the Lamb shift (2S-2P energy splitting) in muonic hydrogen has revealed a ten times more precise value of the proton charge radius, Rp. This new value differs, however, by 7 standard deviations from the 2010 CODATA value of Rp which is extracted from hydrogen spectroscopy and elastic electron-proton scattering.

This so-called "proton radius puzzle" has created many ideas ranging from novel proton structure effects all the way to physics beyond the Standard Model.

We will present new measurements of transitions in muonic hydrogen and deuterium, and give an update on the "proton radius puzzle"