Enhancement of Radiatively Induced Magnetic Moment Form-Factors of Muon: an Effective Lagrangian Approach

Abstract

Using an effective lagrangian approach, we identify a class of models in which the loop-induced magnetic moment form-factors of muon are enhanced by possibly large factors (Λ^2_F/Λ^2)(m_τ/m_μ)\ln(m_τ^2/Λ^2) or (Λ^2_F/Λ^2)\ln(m_μ^2/Λ^2), where Λis the scale of new physics and Λ_F is the Fermi scale. These follow from left- and right-chirality mixing dimension-8 operators which for relatively small Λ, as required to explain the new (g_μ-2) measurement, dominate over dimension-6 operators. Thus significant enhancement of new physics contributions to (g_μ-2) and, in the presence of intergenerational couplings, also to the μ\to eγdecay rate is possible. We discuss the compatibility of the (g_μ-2) and μ\to eγexperimental data in this case and comment on the enhancement of the electron anomalous magnetic moment. An explicit model is presented to illustrate the general results.

Discussion on the enhancement of electron anomalous magnetic moment included. New references added

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Cited by in corpus (7)

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• Lepton Dipole Moments and Rare Decays in the CP-violating MSSM with Nonuniversal Soft-Supersymmetry Breaking
• Resummations with renormalon effects for the hadronic vacuum polarization contribution to the muon (g-2)
• Kaluza-Klein Theories and the Anomalous Magnetic Moment of the Muon
• Electron and Muon $g-2$ Contributions from the $T^{\prime }$ Higgs Sector