New measurement of the $1S-3S$ transition frequency of hydrogen: contribution to the proton charge radius puzzle

Abstract

We present a new measurement of the $1S-3S$ two-photon transition frequency of hydrogen, realized with a continuous-wave excitation laser at 205 nm on a room-temperature atomic beam, with a relative uncertainty of $9\times 10^{-13}$. The proton charge radius deduced from this measurement, $r_{\text{p}}=0.877(13)$ fm, is in very good agreement with the current CODATA-recommended value. This result contributes to the ongoing search to solve the proton charge radius puzzle, which arose from a discrepancy between the CODATA value and a more precise determination of $r_{\text{p}}$ from muonic hydrogen spectroscopy.

5 pages, 4 figures, accepted for publication by Phys. Rev. Lett

References in corpus (2)

• Progress in Atomic Fountains at LNE-SYRTE
• The Proton Radius Puzzle

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