Observing Heavy Top Quarks with charge 5/3 and Heavy $B$ quarks with the CMS detector: A Feasibility Study

In this note, we present a feasibility study for searches for two exotic particles - a heavy top quark with a fractional charge of 5/3, $T_{5/3}$, and its partner, the heavy $B$ quark. These particles decay to a top quark and a $W$ boson, leading to very busy events with multi-leptons and multi-jets. We consider the event signatures where same-sign dileptons are likely to be produced. The backgrounds are predominantly from standard model signatures due to $t\overline t WW$, $t\overline t W$ and multiple-$W$+jets production. We conclude that it is possible to observe these exotic particles with masses around 500 GeV, in data samples ranging from a few hundred inverse pico-barns to about 1~fb$^{-1}$ of integrated luminosity.