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.

3 pages

References in corpus (7)

• Measurement of the Positive Muon Anomalous Magnetic Moment to 0.46 ppm
• Collider Probes of Axion-Like Particles
• Measurement of the Electron Magnetic Moment
• Preferred-Frame and CP-Violation Tests with Polarized Electrons
• MICROSCOPE mission: final results of the test of the Equivalence Principle
• Measurement of the anomalous precession frequency of the muon in the Fermilab Muon g-2 experiment
• Appearance of Light Clusters in Post-bounce Evolution of Core-Collapse Supernovae

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