A new Higgs effective field theory and the new no-lose theorem

Non-decoupling effects of heavy new particles cannot be described by the standard effective field theory with finite truncation of higher dimensional operators. We propose a new effective field theory in which non-decoupling quantum effects of new physics are correctly described. We discuss vacuum stability and perturbative unitarity in our effective field theory, and we find that the scale of new physics can be estimated if we will observe the Higgs coupling deviation via non-decoupling effects in future collider experiments.