Abstract
The vectorlike top partners are potential signature of some new physics beyond the Standard Model at the TeV scale. In this paper, we propose to search for the vectorlike T quark with charge 2/3 in the framework of a simplified model where the top partners only couples with the third generation of Standard Model quarks. We investigate the observability for electroweak production of a vectorlike T quark in association with a standard model bottom quark through the process pp rightarrow Tbar{b}j with the subsequent decay mode of Trightarrow t(rightarrow b W^+rightarrow b ell ^{+} nu _{ell })h( rightarrow gamma gamma ), at the proposed High Energy Large Hadron Collider (HE-LHC) and Future Circular Collider in hadron-hadron mode (FCC-hh) including the realistic detector effects. The 95% confidence level excluded regions and the 5sigma discovery reach in the parameter plane of kappa _{T}-m_T, are respectively obtained at the HE-LHC with the integrated luminosity of 15 ab^{-1} and the FCC-hh with the integrated luminosity of 30 ab^{-1}. We also analyze the projected sensitivity in terms of the production cross section times branching fraction at the HE-LHC and FCC-hh.
Highlights
For δ = 0 and κT = 0.3, top partner can be probed at 5σ level with mass about 1.5 TeV at the High Energy Large Hadron Collider (HE-LHC) and up to 2.1 TeV at the Future Circular Collider in hadron-hadron mode (FCC-hh) thorough the single production followed the T → th decay channel, while the 95% exclusion limits for top partner mass can be reached at about 1.7 TeV at HE-LHC and 2.6 TeV at the FCC-hh
To estimate the impact of systematic uncertainty, for δ = 10% and κT = 0.3, we find that top partner mass can be reached at about 1.75 TeV at the FCC-hh, while the exclusion limit for top partner mass to be about 2.3 TeV at the FCC-hh
The vectorlike top partners play a central role in many new physics (NP) models which attempt to address the hierarchy problem
Summary
Searches for singly produced top partners can be used to probe these EW couplings, which would serve a as a complementary channel to for future collider once the top partner is discovered and its mass determined. The rough estimation by Backovic et al [44] has shown that it is challenging to observe the T quark with the diphoton decay channel at the 14 TeV LHC due to the small production cross section. 2, we briefly describe the simplified model and calculate the single top partner production cross section at the HE-LHC and FCChh. In Sect.
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