arXiv.org > hep-ph > arXiv:1203.0312 Unconstraining the Unhiggs Christoph Englert, Michael Spannowsky, David Stancato, John Terning (Submitted on 1 Mar 2012 (v1), last revised 14 May 2012 (this version, v2)) We investigate whether or not perturbative unitarity is preserved in the Unhiggs model for the scattering process of heavy quarks and longitudinal gauge bosons q¯q→V+LV−L. With the Yukawa coupling given in the original formulation of the Unhiggs model, the model preserves unitarity for Unhiggs scaling dimensions d≤1.5. We examine the LHC phenomenology that is implied by the Unhiggs model in this parameter range in detail and discuss to what extent the LHC can test d if an excess is measured in the phenomenologically clean ZZ channel in the future or if the LHC measurement remains consistent with the background. We then make use of the AdS/CFT correspondence to derive a new Yukawa coupling that is conformally invariant at high energies, and show that with this Yukawa coupling the theory is unitary for 1≤d<2.