Constraints on Four Fermion Contact Interactions from Precise Electroweak Measurements

Abstract

We establish constraints on a general four-fermion contact interaction from precise measurements of electroweak parameters. We compute the one-loop contribution for the leptonic $Z$ width, anomalous magnetic, weak-magnetic, electric and weak dipole moments of leptons in order to extract bounds on the energy scale of these effective interactions.

16 pages, RevTeX, two figures

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• Torsion in Extra Dimensions and One-Loop Observables
• Corrections to (pseudo)scalars decay into a fermion pair from gravitational torsion
• Corrections to Higgs width decay into a fermion pair from gravitational torsion