Production of exotic composite quarks at the LHC

Abstract

We consider the production at the LHC of exotic composite quarks of charge $Q=+(5/3)e$ and $Q=-(4/3)e$. Such states are predicted in composite models of higher isospin multiplets ($I_W=1$ or $I_W=3/2$). Given their exotic charges (such as $5/3$), their decays proceed through the electroweak interactions. We compute decay widths and rates for resonant production of the exotic quarks at the LHC. Partly motivated by the recent observation of an excess by the CMS collaboration in the $e/p_{T}jj$ final state signature we focus on $pp\to U^{+}j\to W^{+}+jj\to {\ell }^{+}/p_{T}jj$ and then perform a fast simulation of the detector reconstruction based on DELPHES. We then scan the parameter space of the model ($m_{\ast }=\Lambda$) and study the statistical significance of the signal against the relevant standard model background ($Wjj$ followed by leptonic decay of the $W$ gauge boson) providing the luminosity curves as function of $m_{\ast }$ for discovery at 3- and 5-$\sigma$ level.

14 pages, 10 figures

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• Like-sign dileptons with mirror type composite neutrinos at the HL-LHC
• Vector-like quarks decaying into singly and doubly charged bosons at LHC