2001/03/31 by Martti Raidal, M. Raidal
Physics and Astronomy · #Neutrino Physics Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1016/s0370-2693(01)00504-4
published as Phys.Lett. B508 (2001) 51-57 · Discussion on the enhancement of electron anomalous magnetic moment included. New references added
arxiv created 2001/04/15 · openalex publication_date 2001/05/01 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
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 (Λ2F/Λ2)(mτ/mμ)ln(mτ2/Λ2) or (Λ2F/Λ2)ln(mμ2/Λ2), where Λis the scale of new physics and ΛF 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 (gμ-2) measurement, dominate over dimension-6 operators. Thus significant enhancement of new physics contributions to (gμ-2) and, in the presence of intergenerational couplings, also to the μ→ eγdecay rate is possible. We discuss the compatibility of the (gμ-2) and μ→ 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.