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All sourcesNASA NTRSDOE OSTI
DOE OSTI2017

Constraints from Triple Gauge Couplings on Vectorlike Leptons

We study the contributions of colorless vectorlike fermions to the triple gauge couplings W+W-γ and W+W-Z0. 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 precision δκV∼O(10-4), V=γ,Z0. 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→γγ decay, even assuming the considerable improvement of the latter measurements achievable at the new machines.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗