Exploring vector-like top quark pair production via charged Higgs decays in multi-b-jet and opposite-sign dilepton final state at the LHC
Year: 2025
Type: article
Abstract: We investigate the discovery prospects of a vector-like top partner (VLT) in the Type-II Two-Higgs-Doublet Model (2HDM-II) extended by a vector-like quark (VLQ) doublet ( TB ) at the 14 TeV Large Hadron Collider (LHC). In this work, the VLT is pair-produced via $$pp \rightarrow T\bar{T}$$ p p → T T ¯ and predominantly decays through the cascade $$T \rightarrow H^+ b \rightarrow t b b$$ T → H + b → t b b , with the top quark decaying leptonically. The resulting final state, comprising an opposite-sign lepton pair and multiple b -jets, offers a clean experimental signature. We evaluate the discovery significance as a function of the VLT and charged Higgs masses, integrated luminosity, and background systematic uncertainties. For $$m_{H^\pm } = 600$$ m H ± = 600 GeV and 5% systematic uncertainty, a $$5\sigma $$ 5 σ discovery is achievable for $$m_T \lesssim 1300$$ m T ≲ 1300 GeV with 300 fb $$^{-1}$$ - 1 luminosity. At higher luminosities of 1000 and 3000 fb $$^{-1}$$ - 1 , the reach extends to 1500–1600 GeV, depending on the level of systematic uncertainty. While heavier $$H^\pm $$ H ± masses reduce sensitivity, discovery remains attainable at high luminosity.
Source: The European Physical Journal C
Authors: R. Benbrik, M. Berrouj, M. Boukidi, K. Kahime
Institutions: Cadi Ayyad University, Polish Academy of Sciences
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
Funder: Narodowe Centrum Nauki
Award: G5314822124
OpenAlex ID: W4410189166