Abstract
In this paper we study the contribution of new possible heavy quarks to the process $\mathrm{h}\mathrm{a}\mathrm{d}\mathrm{r}\mathrm{o}\mathrm{n}\ensuremath{-}\mathrm{h}\mathrm{a}\mathrm{d}\mathrm{r}\mathrm{o}\mathrm{n}\ensuremath{\rightarrow}{W}^{+}{W}^{\ensuremath{-}}X$. We consider new exotic quarks as proposed in three extended electroweak models: the vector singlet model (VSM), the vector doublet model (VDM), and the fermion---mirror-fermion model (FMFM). We discuss the high energy unitarity behavior for the elementary process and their implications. We present the predictions of the exotic quark contribution for the CERN Large Hadron Collider (LHC). We present some distributions that can separate the standard model contribution from the new exotic quark contribution.
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