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Vectorlike lepton imprints at lepton g−2 measurements and e+e− colliders

Sang Quang Dinh1 and Hieu Minh Tran2,*

  • *Contact author: hieu.tranminh@hust.edu.vn
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Phys. Rev. D 113, 035025 – Published 23 February, 2026

DOI: https://doi.org/10.1103/w45p-zqx4

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- 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 SU(2) 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 e+e− colliders are analyzed. Taking into account the updated measurement results of the electron and muon g−2, as well as the Large Electron-Positron Collider and the LHC data, the viable parameter space of the model is identified. We also examine the prospect of testing the model using μ+μ− 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.

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Phys. Rev. D 113, 035025– Published 23 February, 2026
  • Received 9 September 2025
  • Accepted 4 February 2026
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