Unconstraining the Unhiggs
Christoph Englert, Michael Spannowsky, David Stancato, John Terning

TL;DR
This paper examines the unitarity of the Unhiggs model for heavy quark and gauge boson scattering, exploring its phenomenology at the LHC and proposing a conformally invariant Yukawa coupling to extend unitarity bounds.
Contribution
It introduces a new conformally invariant Yukawa coupling in the Unhiggs model, extending unitarity to higher scaling dimensions using AdS/CFT correspondence.
Findings
Unitarity preserved for d ≤ 1.5 with original Yukawa coupling.
LHC phenomenology can test the Unhiggs model in certain parameter ranges.
New Yukawa coupling ensures unitarity for 1 ≤ d < 2.
Abstract
We investigate whether or not perturbative unitarity is preserved in the Unhiggs model for the scattering process of heavy quarks and longitudinal gauge bosons . With the Yukawa coupling given in the original formulation of the Unhiggs model, the model preserves unitarity for Unhiggs scaling dimensions . 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 if an excess is measured in the phenomenologically clean 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 .
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