Search for Charged Higgs Bosons through Vector-Like Top Quark Pair Production at the LHC

We investigate the production and decay of a vector-like top partner (T) with charge 2/3 within the Two Higgs Doublet Model Type II (2HDM-II) extended by a vector-like quark (VLQ) doublet (TB). This study focuses on the decay sequence where the T quark produces a charged Higgs boson (H^+) and a bottom quark, followed by the H^+ decay into a top and bottom quark, due to the small branching ratio for H^+ in the studied region. Previous research https: //doi. org/10. 1103/PhysRevD. 109. 055016Phys. Rev. D109, 055016 has shown that the decay pathway T H^+b followed by H^+ tb is dominant across a significant portion of the parameter space. We analyze the collider process pp TT (bH^+) (bH^-) (b (tb) ) (b (tb) ), resulting in final states enriched with bottom quarks. Our findings highlight this channel as a promising avenue for discovering the new top partner and charged Higgs boson, offering substantial detection potential across a broad parameter space.