The proton radius puzzle
J. J. Krauth, K. Schuhmann, M. Abdou Ahmed, F. D. Amaro, P. Amaro, F., Biraben, J. M. R. Cardoso, M. L. Carvalho, D. S. Covita, A. Dax, S. Dhawan,, M. Diepold, L. M. P. Fernandes, B. Franke, S. Galtier, A. Giesen, A. L., Gouvea, J. G\"otzfried, T. Graf, M. Guerra, J. Haack
TL;DR
This paper discusses the proton radius puzzle, highlighting the discrepancy between measurements from muonic hydrogen and other methods, and includes new insights from muonic deuterium spectroscopy.
Contribution
It provides an updated overview of the proton radius puzzle and introduces new findings from muonic deuterium spectroscopy.
Findings
Significant discrepancy in proton radius measurements
New insights from muonic deuterium spectroscopy
Implications for fundamental physics
Abstract
High-precision measurements of the proton radius from laser spectroscopy of muonic hydrogen demonstrated up to six standard deviations smaller values than obtained from electron-proton scattering and hydrogen spectroscopy. The status of this discrepancy, which is known as the proton radius puzzle will be discussed in this paper, complemented with the new insights obtained from spectroscopy of muonic deuterium.
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Taxonomy
TopicsAtomic and Molecular Physics · Muon and positron interactions and applications · Particle physics theoretical and experimental studies