Argonne National Laboratory

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The Proton Radius Puzzle: Why We All Should Care

Physics Colloquium
Gerald A. Miller, University of Washington
November 17, 2017 11:00AM to 12:00PM
Building 203

Abstract: A new scalar boson that 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. The implications of recent experiments are discussed.