Constraints from Triple Gauge Couplings on Vectorlike Leptons

Abstract

We study the contributions of colorless vectorlike fermions to the triple gauge couplings $W^{+}{W}^{-}\gamma$ and $W^{+}{W}^{-}{Z}^0$. We consider models in which their coupling to the Standard Model Higgs boson is allowed or forbidden by quantum numbers. We assess the sensitivity of the future accelerators FCC-ee, ILC and CLIC to the parameters of these models, assuming they will be able to constrain the anomalous triple gauge couplings with a precision $\delta {\kappa }_V\sim \mathcal{O}(10^{-4})$, $V=\gamma ,Z^0$. We show that the combination of measurements at different center-of-mass energies helps to improve the sensitivity to the contribution of vectorlike fermions, in particular when they couple to the Higgs. In fact, the measurements at the FCC-ee and, especially, the ILC and the CLIC, may turn the triple gauge couplings into a new set of precision parameters able to constrain the models better than the oblique parameters or the $H\to \gamma \gamma$ decay, even assuming the considerable improvement of the latter measurements achievable at the new machines.

Matches version published in PRD. Some references added and LHC limits included

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• Phenomenology of doublet-triplet fermionic dark matter in nonstandard cosmology and multicomponent dark sectors
• Spontaneous Twin Symmetry Breaking
• The Two Scales of New Physics in Higgs Couplings
• Spontaneous CP Violation and the Strong CP Problem in Left-Right Symmetric Theories