Vectorlike lepton imprints at lepton $g-2$ measurements and $e^+e^-$ colliders
Abstract
A fermion can be chiral or vectorlike with respect to a given symmetry, depending on its coupling to the corresponding gauge boson. Vectorlike fermions have a distinct property that their left-handed and right-handed components behave in the same way under the gauge symmetry. In this paper, we investigate an extension of the standard model with an doublet of vectorlike leptons and two complex scalars. The new physics effects on the lepton anomalous magnetic moment, as well as the electron and muon pair production processes at colliders are analyzed. Taking into account the updated measurement results of the electron and muon , the LEP and the LHC data, the viable parameter space of the model is identified. We also examine the prospect of testing the model using signals from electron-position annihilation at the Future Circular Collider (FCC-ee). The analysis shows that the FCC-ee will be able to exclude a significant part of the parameter space, pinpointing exiguous viable regions to be tested in the future due to its high precision.
Cite
@article{arxiv.2508.20873,
title = {Vectorlike lepton imprints at lepton $g-2$ measurements and $e^+e^-$ colliders},
author = {Sang Quang Dinh and Hieu Minh Tran},
journal= {arXiv preprint arXiv:2508.20873},
year = {2026}
}
Comments
30 pages, 24 figures, accepted for publication in PRD