Confronting spin-3/2 and other new fermions with the muon g-2 measurement

Abstract

The new measurement of the muon's anomalous magnetic moment released by the Muon g-2 experiment at Fermilab sets strong constraints on the properties of many new particles. Using an effective field theory approach to the interactions of higher-spin fields, we evaluate the contribution of an electrically neutral and colour singlet spin-3/2 fermion to $(g-2{)}_{\mu }$ and derive the corresponding constraints on its mass and couplings. These constraints are then compared with the ones on spin-1/2 fermions, such as the vector-like leptons that are predicted by various extensions of the Standard Model, the excited leptons which appear in composite models, as well as the charginos and neutralinos of supersymmetric theories. Unlike these new spin-1/2 fermions, the spin-3/2 particles generate only small contributions to the muon anomalous magnetic moment.

References updated, typos fixed and comments added; results unchanged

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Cited by in corpus (11)

• New physics explanations of $a_{\mu }$ in light of the FNAL muon $g-2$ measurement
• A complete effective field theory for dark matter
• Charged lepton flavor violation in light of the muon magnetic moment anomaly and colliders
• Muon $(g-2)$ in the B-LSSM
• Magnetic Moments of Leptons, Charged Lepton Flavor Violations and Dark Matter Phenomenology of a Minimal Radiative Dirac Neutrino Mass Model
• Shedding light on dark matter with recent muon $(g-2)$ and Higgs exotic decay measurements
• The Muon Magnetic Moment and Physics Beyond the Standard Model
• The Two Scales of New Physics in Higgs Couplings
• Gravitino Thermal Production, Dark Matter, and Reheating of the Universe
• Sparticle Spectroscopy at LHC-Run3 and LSP Dark Matter in light of Muon g-2
• Charting the new physics through one-loop effects in the muon magnetic dipole moment