Top-Mode Pseudos at the LHC

Abstract

We discuss LHC phenomenologies of the Top-Mode Pseudos $(h^0_t,A^0_t)$, composite pseudo Nambu--Goldstone bosons predicted in the model recently proposed in a framework of the top quark condensation. The CP-even Top-Mode Pseudo, dubbed tHiggs ($h^0_t$), is identified with the 126 GeV Higgs boson at the LHC. We analyze the coupling properties of the tHiggs in comparison with the currently available data reported from LHC Run-I to find that the tHiggs can be consistent with the LHC Higgs boson. The mass formula relating masses of the Top-Mode Pseudos allows us to place an indirect limit on the mass of the CP-odd Top-Mode Pseudo ($A^0_t$) from the constraint on the tHiggs coupling strengths. The presence of the mass formula also significantly affects the coupling property of $A^0_t$, which ensures $A^0_t$ weakly coupled to the Standard Model particles. The direct limit on the mass of $A^0_t$ is placed by data on searches for new resonances in several channels at the LHC Run-I. We find the lower mass bound from both the indirect and direct limits, $m_{A^0_t} \gtrsim 560$ GeV. The discovery channel of $A^0_t$ in the upcoming LHC Run-II is also addressed.