Miha Mihovilovič: The ever-changing proton radius
Source: Monday physics colloquium
The ever-changing proton radius
Jožef Stefan Institute, Ljubljana
Institut für Kernphysik, Johannes Gutenberg-Universität, Mainz
The discrepancy between the proton charge radius determined by Lamb shift measurements in muonic hydrogen and the radius obtained from elastic scattering submits all existing data to scrutiny and questions our understanding of QED. To provide new insight into the problem, several new experiments are underway. They are complemented by extensive theoretical efforts focused on processes influencing the Lamb shift extractions as well as ways to interpret the form-factor measurements. Features and challenges of these new experiments will be discussed, together with the results of the most recent measurements and prospects for future studies.
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