Higgs Bosons Strongly Coupled to the Top Quark

Abstract

Several extensions of the Standard Model require the burden of electroweak symmetry breaking to be shared by multiple states or sectors. This leads to the possibility of the top quark interacting with a scalar more strongly than it does with the Standard Model Higgs boson. In top-quark condensation this possibility is natural. We also discuss how this might be realized in supersymmetric theories. The properties of a strongly coupled Higgs boson in top-quark condensation and supersymmetry are described. We comment on the difficulties of seeing such a state at the Tevatron and LEPII, and study the dramatic signatures it could produce at the LHC. The four top quark signature is especially useful in the search for a strongly coupled Higgs boson. We also calculate the rates of the more conventional Higgs boson signatures at the LHC, including the two photon and four lepton signals, and compare them to expectations in the Standard Model.

Figures (9)

• Figure 1: Limits on the charged Higgs mass versus $x=\sin\beta$ obtained r37 from comparing the measured $B(B\rightarrow X_s\gamma)$ rate to the predicted rate.
• Figure 2: Contours of $\delta R_b$ versus $x=\sin\beta$ for four values of $m_{H^+}$. Comparing experimental data to the theoretical prediction requires that $|\delta R_b|\hbox{$\;\stackrel{<}{\sim}\;$} 0.002$.
• Figure 3: Branching fractions of $H\equiv {h^0_t}$ versus its mass for $x\equiv f_{\pi_t}/v=1/4$.
• Figure 4: Production cross sections of the top Higgs boson $H\equiv h^0_t$ at the LHC with with $\sqrt{s}=14 \hbox{\rm,TeV}$ for $x\equiv f_{\pi_t}/v=1/4$.
• Figure 5: Cross sections for the production and two-body decays of the top Higgs boson $H\equiv h^0_t$ for $x\equiv f_{\pi_t}/v=1/4$.