Exotic decays of top partners with charge 5/3: bounds and opportunities

Understand

Exotic decays of top partners in new bosons are the norm in realistic models of a composite Higgs.

• We focus on the custodial charge-$5/3$ partner, which normally decays exclusively into $tW^+$.
• The new channels include a colour-sextet, $X_{5/3} \to \bar{b} \pi_6$, as well as singly and doubly charged scalars, $X_{5/3} \to t \phi^+$, $b \phi^{++}$.
• We use existing same-sign lepton searches to show that the new final states are constrained at the same level as the standard one.