1996/08/13 by M. C. González-García, M. C. Gonzalez-Garcia, S. F. Novaes · 7 citations
Engineering · Mathematics · Physics and Astronomy · #Dark Matter and Cosmic Phenomena #Engineering #Excited state #Fermion #Lagrangian #Lepton #Loop (graph theory) #Mathematics #Nuclear physics #Oblique case #Observable #Particle physics #Particle physics theoretical and experimental studies #Physics #Physics beyond the Standard Model #Quantum Chromodynamics and Particle Interactions #Quantum electrodynamics #Quantum mechanics #Sensitivity (control systems) #Theoretical physics #hep-ph
paper · pdf · doi:10.1016/s0550-3213(96)00651-7
published in Nuclear Physics B 486(1-2), 3-22 (Elsevier BV) · 25 pages 6 figures
arxiv created 1996/08/13 · openalex publication_date 1997/02/01 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We investigate the effects induced by excited leptons at the one-loop level in the observables measured on the Z peak at LEP. Using a general effective Lagrangian approach to describe the couplings of the excited leptons, we compute their contributions to both oblique parameters and Z partial widths. Our results show that the new effects are comparable to the present experimental sensitivity, but they do not lead to a significant improvement on the available constraints on the couplings and masses of these states.