Precision Rydberg state spectroscopy with slow electrons and the proton-radius puzzle
Precision Rydberg state spectroscopy with slow electrons and the proton-radius puzzle
The so-called proton-radius puzzle (the current discrepancy of proton radii determined from spectroscopic measurements in ordinary versus muonic hydrogen) could be addressed via an accurate measurement of the Rydberg constant because the proton radius and the Rydberg constant values are linked through high-precision optical spectroscopy. We argue that, with manageable …