Boosted top quark signals for heavy vector boson excitations in a universal extra dimension model

In view of the fact that the n=1 Kaluza-Klein (KK) modes in a model with a universal extra dimension could mimic supersymmetry signatures at the LHC, it is necessary to look for the n=2 KK modes, which have no analogues in supersymmetry. We discuss the possibility of searching for heavy n=2 vector boson resonances—especially the g₂—through their decays to a highly boosted top quark-antiquark pair using recently developed top-jet tagging techniques in the hadronic channel. It is shown that tt¯ signals from the n=2 gluon resonance are as efficient a discovery mode at the LHC as dilepton channels from the γ₂ and Z₂ resonances.