Exotic Quark Production in ep Collisions

We investigate the single production and decay of charge -1/3, weak isosinglet vectorlike exotic $D$ quarks in string inspired $E_6$ theories at future ep colliders; THERA with $\sqrt s$=1 TeV, L=40 $pb^{-1}$ and CERN Large Hadron Electron Collider (LHeC) with $\sqrt s$=1.4 TeV, $L=10^4$ $pb^{-1}$. We found that an analysis of the decay modes of $D$ should probe the mass ranges of 100-450 GeV and 100-1200 GeV at the center of mass energies, 1 and 1.4 TeV, respectively.

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