Probing two Universal Extra Dimension model with leptons and photons at the LHC and ILC

TL;DR

This paper explores collider signatures of universal extra dimension models at the LHC and ILC, identifying potential signals that could distinguish new physics from the Standard Model within certain energy ranges.

Contribution

It provides the first detailed analysis of electroweak mode excitations in 2UED models at both LHC and ILC, including signal predictions and significance levels.

Findings

Two lepton plus missing energy signals detectable up to 400 GeV.

Three lepton plus missing energy signals detectable up to 600 GeV.

Single photon plus missing energy signal observable with beam polarization at ILC.

Abstract

We discuss the collider signatures of electroweak (1,0)-mode excitations in the framework of two universal extra dimension (2UED) at the LHC and ILC. In general, pair production of electroweak (1,0)-mode particles of 2UED gives rise to multi lepton plus missing transverse momentum signal. Upto 1/R = 400 GeV two lepton plus missing transverse momentum signal and upto 1/R = 600 GeV three lepton plus missing transverse momentum signal stands over the $5\sigma$ standard deviation of the Standard Model background at the LHC with $100 fb^{-1}$ integrated luminosity. At ILC we study single photon plus missing energy signal from the production of U(1) gauge boson in association with a U(1) spinless adjoint. With proper choice of beam polarization, signal strength is greater than $5\sigma$ standard deviation of the Standard Model background almost upto the kinematic limit of the collider.