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We study the discovery potential of down type iso-singlet quarks, $D$,predicted by the $E_6$ GUT model in the ${pp\rightarrow D\bar{D}\rightarrowZZd\bar{d} \rightarrow \ell^+\ell^-\ell^+\ell^- d\bar{d}}$ channel at theHL-LHC and FCC-hh colliders. The analysis is performed using a high levelanalysis description language and its runtime interpreter. The study showsthat, using solely this channel, HL-LHC can discover $D$ quarks up to a mass of710 GeV whereas FCC-hh up to 2430 GeV with data collected in their complete runperiods.

Down type iso-singlet quarks at the HL-LHC and FCC-hh