Chasing the two-Higgs-doublet model via electroweak corrections at e⁺e⁻ colliders

We present a comprehensive study of Higgs boson production associated with a neutrino pair at e⁺e⁻ colliders (e⁺ e⁻ → h \, νν) at the next-to-leading-order accuracy in both the Standard Model and the two-Higgs-doublet model. We show that new physics effects from the extended Higgs sector can be probed through electroweak corrections, which lead to several percent deviations from the Standard Model predictions in total cross sections and differential distributions, even in the alignment limit. This highlights the potential of precision studies at future e⁺e⁻ colliders for searching new physics.