Regular Article - Theoretical Physics
Excited lepton triplet contribution to electroweak observables at one loop level
Department of Physics, Comsats University, Islamabad, Pakistan
2 Departamento de Ciencias Integradas, Facultad de Ciencias Experimentales, Campus El Carmen, Universidad de Huelva, Huelva, Spain
3 INFN, Sezione di Perugia, Via A. Pascoli, 06123, Perugia, Italy
Accepted: 19 April 2021
Published online: 5 May 2021
In this paper, we present the one-loop radiative corrections to the electroweak precision observable coming from the multiplet excited leptons. We have calculated the couplings of the exotic lepton triplet to the vector bosons and ordinary leptons using the effective Lagrangian approach. These couplings are then used to estimate the excited lepton triplet contribution to the parameter. The mass degenerate excited lepton contribution to is small and can be neglected. However, if the excited leptons are non-degenerate, their contribution can be large which can result in more stringent constraints on the excited fermion parameter space compared to the constraints from present experimental searches and perturbative unitarity condition.
© The Author(s) 2021
Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
Funded by SCOAP3