Impact of Lorentz violation on anomalous magnetic moments of charged leptons

Abstract

We address the question whether a violation of Lorentz symmetry can explain the tension between the measurement and the Standard-Model prediction of the anomalous magnetic moment of the muon ($(g-2{)}_{\mu }$) and whether it can significantly impact the one of the electron ($(g-2{)}_e$). While anisotropic Lorentz-violating effects are, in general, expected to produce sidereal oscillations in observables, isotropic Lorentz violation in the charged-lepton sector could feed into $(g-2{)}_{e,\mu }$. However, we find that this type of Lorentz violation, parametrised via a dim-4 field operator of the Standard-Model Extension (SME), is already strongly constrained by the absence of vacuum Čerenkov radiation and photon decay. In particular, the observations of very-high-energetic astrophysical photons at LHAASO and of high-energetic electrons (muons) by the LHC (IceCube) place the most stringent two-sided bounds on the relevant SME coefficients $\stackrel{\circ }{c}{}^{(e)}$ ($\stackrel{\circ }{c}{}^{(\mu )}$). Therefore, any explanation of the tension in $(g-2{)}_{\mu }$ via isotropic Lorentz violation of the minimal spin-degenerate SME is excluded, and the possible size of its impact on $(g-2{)}_e$ is very limited.

arXiv comment10 pages, 2 figures

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• Fermionic quantum gas at finite temperature within a Lorentz violating background