https://doi.org/10.1140/epjc/s10052-021-09153-1
Regular Article - Theoretical Physics
Excited lepton triplet contribution to electroweak observables at one loop level
1
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
Received:
16
October
2020
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
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