Sensitivities of prospective future e + e − colliders to decoupled new physics

We explore the indirect sensitivities to decoupled new physics of prospective precision electroweak measurements, triple-gauge-coupling measurements and higgs physics at future e + e − colliders, with emphasis on the ilc250 and fcc-ee. the standard model effective field theory (sm eft) is adopted as a model-independent approach for relating experimental precision projections to the scale of new physics, and we present prospective constraints on the wilson coefficients of dimension-6 operators. we find that in a marginalised fit ilc250 ewpt measurements be sensitive to new physics scales $$ lambda = mathcal{o}(10) $$ tev, and fcc-ee ewpt measurements be sensitive to $$ lambda = mathcal{o}(30) $$ tev. the prospective sensitivities of higgs and tgc measurements at the ilc250 (fcc-ee) are to $$ lambda = mathcal{o}(1) $$ tev $$ lambda = mathcal{o}(2) $$ tev).