Bulletin of the American Physical Society
5th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Volume 63, Number 12
Tuesday–Saturday, October 23–27, 2018; Waikoloa, Hawaii
Session 1WEA: Proton Charge Radius Puzzle I
9:00 AM–11:00 AM,
Tuesday, October 23, 2018
Hilton Room: King's 1
Chair: Toshimi Suda, Tohoku University
Abstract ID: BAPS.2018.HAW.1WEA.3
Abstract: 1WEA.00003 : Proton Zemach radius measurement by the hyperfine splitting of muonic hydrogen
10:00 AM–10:30 AM
A new measurement of the ground-state hyperfine splitting of muonic hydrogen by laser spectroscopy is proposed. The hyperfine splitting energy shift is connected to the proton Zemach radius , which is a convolution of the distribution of the charge distribution with the magnetic moment distribution. This can provide new insights on "Proton radius puzzle" . When the laser with the resonance frequency of the hyperfine splitting energy is irradiated, the spin-flip transition is induced from the spin-singlet to the spin-triplet hyperfine sub-levels. Since the muon spin in the spin-triplet state can be polarized by a circularly-polarized laser, we can search for the resonance frequency with the muon decay asymmetry by the decay-electron detection [3,4]. The transition energy is about 0.182 eV, which corresponds to the laser wavelength of 6.7 μm. A narrow-bandwidth tunable mid-infrared laser is being developed in RIKEN . We also started test measurement optimizing the muon beam stopping in the hydrgen gas.
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 Y. Ma, et al., Int. J. of Modern Physics: Conf. Series 40 (2016) 1660046 S. Kanda et al., Proceeding of Science, PoS (NuFACT2017) 122 (2018)
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.HAW.1WEA.3
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