# The leptonic future of the Higgs

Journal of High Energy Physics, Sep 2017

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 (${e}^{+}{e}^{-}\to t\overline{t}h$) 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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Gauthier Durieux, Christophe Grojean, Jiayin Gu, Kechen Wang. The leptonic future of the Higgs, Journal of High Energy Physics, 2017, 14, DOI: 10.1007/JHEP09(2017)014