Boosted Top Quark Signals for Heavy Vector Boson Excitations in a Universal Extra Dimension Model

Abstract

In view of the fact that the $n=1$ Kaluza-Klein (KK) modes in a model with a Universal Extra Dimension (UED), 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 $g_2$ -- 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 $t\bar{t}$ signals from the $n=2$ gluon resonance are as efficient a discovery mode at the LHC as dilepton channels from the ${\gamma }_2$ and $Z_2$ resonances.

Comments: 22 pages, 8 embedded figures