Neutrino oscillation data from solar, reactor, accelerator, and atmospheric experiments place new limits on a vector fifth force coupled to lepton spins and exclude it as an explanation of the muon g-2 anomaly.
Muon g-2 and a Geocentric New Field
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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.
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Testing the Fifth Force on Lepton Spins through Neutrino Oscillations
Neutrino oscillation data from solar, reactor, accelerator, and atmospheric experiments place new limits on a vector fifth force coupled to lepton spins and exclude it as an explanation of the muon g-2 anomaly.