LHC Signatures of a Vector-Like Top Partner and Charged Higgs Boson in the 2HDM-II

I will discuss the collider phenomenology of vector-like quarks in the context of an extended Higgs sector. The study focuses on a vector-like top partner (VLT) embedded in the Type-II Two-Higgs-Doublet Model, where the additional Higgs doublet opens new decay channels beyond the Standard Model. When the VLT is part of a $(T,B)$ doublet, its couplings to the non-standard Higgs states are significantly enhanced. This leads to decay chains involving the charged Higgs boson and results in final states with large $b$-jet multiplicities and characteristic leptonic signatures. The analysis is based on full Monte Carlo simulations of VLT pair production at the 14 TeV LHC, covering both fully hadronic and semi-leptonic final states. I will present the projected discovery reach: for a charged Higgs mass of $m_{H^\pm}=600$ GeV, a $5\sigma$ signal is attainable for VLT masses up to about 1.3 TeV with 300 fb$^{-1}$, and up to roughly 1.5 TeV at higher luminosities.