Search for single production of vectorlike top partners through th channel at the HE-LHC and FCC-hh

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 -> T (b) over barj with the subsequent decay mode of T -> t (-> bW(+) -> bl(+)upsilon(l))h (-> 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 5 sigma 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.

Automated summary

This study proposes, within a simplified model framework, the observation of the electroweak production of a vectorlike T quark associated with a standard model bottom quark at the HE-LHC and FCC-hh, obtaining excluded regions and discovery reach in the parameter plane, as well as analyzing the sensitivity in terms of production cross section times branching fraction at both colliders.