On the future of Higgs, electroweak and diboson measurements at lepton colliders

Understand

LEP precision on electroweak measurements was sufficient not to hamper the extraction of Higgs couplings at the LHC.

• But the foreseen permille-level Higgs measurements at future lepton colliders might suffer from parametric electroweak uncertainties in the absence of a dedicated electroweak program.
• We perform a joint, complete and consistent effective-field-theory analysis of Higgs and electroweak processes.
• The full electroweak-sector dependence of the $e^+e^- \to WW$ production process is notably accounted for, using statistically optimal observables.