An Axial-Vector Leptophilic Fifth Force Sourced by Solar Neutrinos
Rundong Fang, Ji-Heng Guo, Jia Liu, Xiao-Ping Wang, and YanLi Zhao

TL;DR
This paper explores a new long-range leptophilic axial-vector force mediated by a light gauge boson, sourced by solar neutrinos, with potential observable effects on muon magnetic moments and electron spin experiments.
Contribution
It introduces two models of leptophilic axial-vector interactions sourced by solar neutrinos and analyzes their experimental signatures and bounds.
Findings
Bounds on coupling $g' \, \lesssim 10^{-19}$ for muon interactions
Bounds on coupling $g' \, \lesssim 10^{-22}$ for electron interactions
Distinct diurnal signature in muon g-2 measurements
Abstract
We investigate long-range, purely leptophilic axial-vector interactions mediated by a light gauge boson 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 with inter-generation cancellations. In both cases, the solar neutrino flux acts as an extended current that sources a macroscopic 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, , 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 in both model frameworks for a light, effectively massless…
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Taxonomy
TopicsNeutrino Physics Research · Computational Physics and Python Applications · Dark Matter and Cosmic Phenomena
