Narrow Results

The top-seesaw assisted technicolor (TC) model, which was proposed recently to accommodate the 126 GeV Higgs mass discovered by the Large Hadron Colliders (LHC), predicts light and heavy charged Higgs bosons in addition to the neutral Higgses. In this paper, we will study the pair productions of the charged Higgs, proceeding through gluon–gluon fusion and quark–antiquark annihilation, at the LHC in the frame of the top-seesaw assisted TC model. We find that in a large part of parameter space the production cross-sections of the light charged Higgs pair at the LHC can be quite large compared with the low standard model backgrounds, while it is impossible for the pair production of the heavy ones to be detected with the strong final mass suppression. Therefore, the light charged Higgs pair production may be served as a probe of this new TC model at the LHC.

We discuss the modified top quark condensation model proposed in Ref. 54. This construction was inspired by the top-seesaw scenario, in which the extra heavy fermion $\chi$ that may be paired with the top quark is added. Besides, this model incorporates the ideas of the little Higgs scenario, in which the 125 GeV scalar particle appears as a pseudo-Goldstone boson. This model admits (in addition to the 125 GeV scalar boson $H$) the heavier scalar excitation $H^{\prime }$. We consider the region of parameters, where its mass is $M_{H^{\prime }}\sim 1\mathrm{\text{TeV}}$, the width of $H^{\prime }$ is ${\mathrm{\Gamma }}_{H^{\prime }}\sim 0.3M_{H^{\prime }}$, while the mass of the heavy fermion is $m_{\chi }\sim 1\mathrm{\text{TeV}}$. We find that in this model the value of the cross-section ${\sigma }_{pp\to H^{\prime }+X\to \gamma +\gamma +X}$ for $\sqrt{s}=13\mathrm{\text{TeV}}$ is essentially smaller than the present experimental upper bound. Besides, we find that for the chosen values of parameters there should exist the CP-even scalar boson with mass $\approx 2m_{\chi }$ and very small width. In addition, the model predicts the existence of the extra neutral CP-even scalar boson and the charged scalar boson with masses of the order of 1 TeV.