Axial-vector leptophilic fifth force sourced by solar neutrinos

Le résumé fourni par la source

We investigate long-range, purely leptophilic axial-vector interactions mediated by a light gauge boson A ′ that couples to charged leptons and, by weak symmetry, to left-handed neutrinos. We analyze two realizations, a minimal effective model with muon-only couplings and an anomaly-free axial U ( 1 ) ′ with intergeneration cancelations. In both cases, the solar neutrino flux acts as an extended current that sources a macroscopic A ′ field at Earth, with spatial components aligned along the Sun-Earth direction. This field produces a distinctive signature in storage-ring measurements of the muon anomalous magnetic moment, ( g − 2 ) μ , namely a diurnal, sign-changing contribution that is positive during daytime and negative at night, superimposed on a time-independent positive offset. We obtain bounds g ′ ≲ O ( 10 − 19 ) in both model frameworks for a light, effectively massless mediator. For completeness, we map the solar-neutrino–sourced potential to electron spin-sensor experiments and find g ′ ≲ O ( 10 − 22 ) in the electron channel.

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