Deciphering Universal Extra Dimension from the top quark signals at the CERN LHC

TL;DR

This paper investigates how Universal Extra Dimension models could be detected at the LHC by analyzing top quark signals, showing that KK excitations can mimic top pairs and could be discovered with sufficient data.

Contribution

It demonstrates the potential to identify Universal Extra Dimension signals through top quark decay signatures at the LHC, with specific kinematic cuts and luminosity requirements.

Findings

KK top/bottom quarks can mimic top-pair signals

Discovery possible for inverse radius up to 750 GeV with 100 fb$^{-1}$

Proper kinematic cuts enhance detection prospects

Abstract

Models based on Universal Extra Dimensions predict Kaluza-Klein (KK) excitations of all Standard Model (SM) particles. We examine the pair production of KK excitations of top- and bottom-quarks at the Large Hadron Collider. Once produced, the KK top/bottom quarks can decay to $b$-quarks, leptons and the lightest KK-particle, $\gamma_1$, resulting in 2 $b$-jets, two opposite sign leptons and missing transverse momentum, thereby mimicing top-pair production. We show that, with a proper choice of kinematic cuts, an integrated luminosity of 100 fb$^{-1}$ would allow a discovery for an inverse radius upto $R^{-1} = 750$ GeV.