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

TL;DR

This paper explores the detection of heavy second-level Kaluza-Klein vector bosons in a Universal Extra Dimension model at the LHC, focusing on their decay into boosted top quark pairs using advanced top-jet tagging techniques.

Contribution

It demonstrates that $n=2$ KK gluon resonances can be effectively discovered via top-jet signatures, providing a new search channel distinct from supersymmetry.

Findings

$tar{t}$ signals from $g_2$ are as promising as dilepton channels for discovery.

Top-jet tagging techniques enhance detection of highly-boosted top quarks.

Second-level KK modes offer unique signatures not mimicked by supersymmetry.

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.