LHC Limits on the Top-Higgs in Models with Strong Top-Quark Dynamics

TL;DR

This paper uses LHC data to set limits on the top-Higgs particle in models with strong top-quark interactions, excluding certain mass ranges and constraining related theories.

Contribution

It provides the first comprehensive constraints on the top-Higgs in models with strong top dynamics using LHC search results.

Findings

Top-Higgs with mass < 300 GeV excluded at 95% CL under specific conditions.

Stronger constraints if top-pion mass exceeds top-quark mass.

Results significantly restrict models like topcolor-assisted technicolor and top-seesaw.

Abstract

LHC searches for the standard model Higgs Boson in WW or ZZ decay modes place strong constraints on the top-Higgs state predicted in many models with new dynamics preferentially affecting top quarks. Such a state couples strongly to top-quarks, and is therefore produced through gluon fusion at a rate enhanced relative to the rate for the standard model Higgs boson. A top-Higgs state with mass less than 300 GeV is excluded at 95% CL if the associated top-pion has a mass of 150 GeV, and the constraint is even stronger if the mass of the top-pion state exceeds the top-quark mass or if the top-pion decay constant is a substantial fraction of the weak scale. These results have significant implications for theories with strong top dynamics, such as topcolor-assisted technicolor, top-seesaw models, and certain Higgsless models.