Abstract
Precision study of electroweak symmetry breaking strongly motivates the construction of a lepton collider with center-of-mass energy of at least 240 GeV. Besides Higgsstrahlung (e+e− → hZ), such a collider would measure weak boson pair production (e+e− → WW) with an astonishing precision. The weak-boson-fusion production process ( {e}^{+}{e}^{-}to nu overline{nu}h ) provides an increasingly powerful handle at higher center-of-mass energies. High energies also benefit the associated top-Higgs production ( {e}^{+}{e}^{-}to toverline{t}h ) that is crucial to constrain directly the top Yukawa coupling. The impact and complementarity of differential measurements, at different center-of-mass energies and for several beam polarization configurations, are studied in a global effective-field-theory framework. We define a global determinant parameter (GDP) which characterizes the overall strengthening of constraints independently of the choice of operator basis. The reach of the CEPC, CLIC, FCC-ee, and ILC designs is assessed.
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