New Measurement of the 1S3S1S-3S Transition Frequency of Hydrogen: Contribution to the Proton Charge Radius Puzzle

Jan 26, 2018
5 pages
Published in:
  • Phys.Rev.Lett. 120 (2018) 18, 183001
  • Published: May 5, 2018
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Abstract: (APS)
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 9×10-13. The proton charge radius deduced from this measurement, rp=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 rp from muonic hydrogen spectroscopy.
Note:
  • 5 pages, 4 figures, accepted for publication by Phys. Rev. Lett