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 |
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Chair: Toshimi Suda, Tohoku University Room: Hilton King's 1 |
Tuesday, October 23, 2018 9:00AM - 9:30AM |
1WEA.00001: The Proton Radius Puzzle- Why We All Should Care Invited Speaker: Gerald Alan Miller Electron and muon probes have separately been used to measure the radius of the proton, but different results have been obtained. This difference has been denoted the proton radius puzzle. The main interest in this subject is the intriguing possibility that violations of electron-muon universality exist. Recent experiments and the various possible solutions, which involve experimental, atomic, nuclear and particle physics, will be reviewed. |
Tuesday, October 23, 2018 9:30AM - 10:00AM |
1WEA.00002: Nucleon form factors from lattice QCD near the physical point Invited Speaker: Shoichi Sasaki We present results of the nucleon form factors measured on a large-volume lattice (8.1 fm)4 at almost the physical point in 2+1 flavor QCD. The configurations are generated with the stout-smeared O(a) improved Wilson quark action and Iwasaki gauge action at beta=1.82, which corresponds to the lattice spacing of 0.085 fm. The pion mass at the simulation point is about 145 MeV. A large spatial volume of (8.1 fm)3 allows us to investigate the form factors at small momentum transfer region. In this talk, we focus on the iso-vector form factors of the nucleon. We carefully examine both electric (GE) and magnetic (GM) iso-vector form factor shapes with a model-independent analysis based on the z-expansion method in order to determine the electric root-mean squared radius and magnetic moment. |
Tuesday, October 23, 2018 10:00AM - 10:30AM |
1WEA.00003: Proton Zemach radius measurement by the hyperfine splitting of muonic hydrogen Invited Speaker: Katsuhiko Ishida 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 [1], 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" [2]. 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 [5]. We also started test measurement optimizing the muon beam stopping in the hydrgen gas. [1] A. Dupays et al., Phys. Rev. A68, 052503 (2003). [2] R. Pohl et al., Nature 466, 213 (2010). [3] M. Sato, et al., Proc. 2nd Int. Symp. Science at J-PARC , JPS Conf. Proc. , 025005 (2015) [4] Y. Ma, et al., Int. J. of Modern Physics: Conf. Series 40 (2016) 1660046 [5] S. Kanda et al., Proceeding of Science, PoS (NuFACT2017) 122 (2018) |
Tuesday, October 23, 2018 10:30AM - 11:00AM |
1WEA.00004: COFFEE BREAK
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