Bulletin of the American Physical Society
2017 Fall Meeting of the APS Division of Nuclear Physics
Volume 62, Number 11
Wednesday–Saturday, October 25–28, 2017; Pittsburgh, Pennsylvania
Session PE: Unraveling the Proton Radius Puzzle |
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Chair: Douglas Higinbotham, Thomas Jefferson National Accelerator Facility Room: Salon 5 |
Saturday, October 28, 2017 10:30AM - 11:06AM |
PE.00001: Spectroscopy of muonic atoms and the proton radius puzzle Invited Speaker: Aldo Antognini We have measured several $2S-2P$ transitions in muonic hydrogen ($\mu$p), muonic deuterium ($\mu$d) and muonic helium ions ($\mu^{3}$He, $\mu^{4}$He). From muonic hydrogen we extracted a proton charge radius 20 times more precise than obtained from electron-proton scattering and hydrogen high-precision laser spectroscopy but at a variance of $7 \sigma$ from these values. This discrepancy is nowadays referred to as the proton radius puzzle. New insight has been recently provided by the first determination of the deuteron charge radius from laser spectroscopy of $\mu$d. The status of the proton charge radius puzzle including the new insights obtained by $\mu$d spectroscopy will be discussed. [Preview Abstract] |
Saturday, October 28, 2017 11:06AM - 11:42AM |
PE.00002: The Proton Radius Experiment at Jefferson Lab (PRad) Invited Speaker: Ashot Gasparian The proton charge radius (Rp) is one of the most fundamental quantities in physics. Precision knowledge of its value is critically important for both nuclear and atomic physics -- especially for the spectroscopy of atomic hydrogen. Recent high precision measurements of Rp using the muonic hydrogen atom demonstrated up to eight standard deviation smaller value than the accepted average from all previous experiments performed with different methods. This fact triggered the well known ``\textit{Proton Charge Radius Puzzle}'' in hadronic physics. The PRad collaboration at Jefferson Lab for the last five years developed a novel magnetic-spectrometer-free e-p scattering experiment to address this puzzle. The experiment was successfully performed in May and June of 2016 with taking high statistics and rich experimental data. The specifics of the experiment together with the preliminary physics results from the data analysis process will be presented and discussed in this talk. [Preview Abstract] |
Saturday, October 28, 2017 11:42AM - 12:18PM |
PE.00003: Electrophobic scalar boson and muonic puzzles Invited Speaker: Gerald A. Miller A new scalar boson which couples to the muon and proton can simultaneously solve the proton radius puzzle and the muon anomalous magnetic moment discrepancy. Using a variety of measurements, we constrain the mass of this scalar and its couplings to the electron, muon, neutron, and proton. Making no assumptions about the underlying model, these constraints and the requirement that it solve both problems limit the mass of the scalar to between about 100 keV and 100 MeV. We identify two unexplored regions in the coupling constant-mass plane. Potential future experiments and their implications for theories with mass-weighted lepton couplings are discussed. [Preview Abstract] |
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