Muon g-2 and a Geocentric New Field

Abstract

Light scalars can in principle couple to both bulk matter and fermion spin, with hierarchically disparate strengths. Storage ring measurements of fermion electromagnetic moments via spin precession can be sensitive to such a force, sourced by the Earth. We discuss how this force could lead to a deviation of the measured muon anomalous magnetic moment, $g-2$, from the Standard Model prediction. Due to its different parameters, the proposed JPARC muon $g-2$ experiment can provide a direct test of our hypothesis. A future search for the proton electric dipole moment can have good sensitivity for the coupling of the assumed scalar to nucleon spin. We also argue that supernova constraints on axion-muon coupling may not be applicable in our framework.

arXiv comment3 pages

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Cited by in corpus (8)

• Spin-dependent exotic interactions
• Searching for axion forces with precision precession in storage rings
• Searching for axion forces with spin precession in atoms and molecules
• Measuring axion gradients with photon interferometry (MAGPI)
• Constraints on monopole-dipole potential from the tests of gravity
• Solar neutrinos and leptonic spin forces
• Muon g-2, Long-Range Muon Spin Force, and Neutrino Oscillations
• Testing the Fifth Force on Lepton Spins through Neutrino Oscillations