Testing Lorentz-symmetry violation via electroweak decays

Abstract

In this work we introduce CPT-odd non-minimal Lorentz-symmetry violating couplings to the electroweak sector modifying the interaction between leptons and gauge bosons. The vertex rules allow us to calculate tree-level processes modified by the presence of the novel dimension-five operators. For definitiveness, we investigate the $W$ decay into a lepton-neutrino pair, the $Z$ decay into pairs of charged and neutral leptons, as well as the decay of the muon. By comparing the experimental measurements on these processes to our results we are able to bound several combinations of the background 4-vectors to be $\lesssim 10^{-4} \, \mbox{GeV}^{-1}$.

arXiv comment12 pages, 2 figures, matches published version

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Cited by in corpus (4)

• Limits on non-minimal Lorentz violating parameters through FCNC and LFV processes
• Re-assessing special aspects of Dirac fermions in presence of Lorentz-symmetry violation
• Constraining EDM and MDM lepton dimension five interactions in the electroweak sector
• Lorentz-symmetry violation in the electroweak sector: scattering processes in future $e^{+}{e}^{-}$ colliders