Probing two Universal Extra Dimensions at International Linear Collider

TL;DR

This paper explores how future electron-positron colliders can detect signals of universal extra dimensions through specific vector boson modes, using photon energy distributions and decay channels, with promising results for certain particles.

Contribution

It introduces a method to identify (1,1)-th KK mode vector bosons in two universal extra dimension models via photon energy spectra and decay signatures at future colliders.

Findings

B(1,1) signals exceed 5σ significance over background

Detection prospects for W3(1,1) are limited due to fewer events

Photon energy distribution effectively measures KK particle masses

Abstract

We discuss collider signatures of (1,1)-th Kaluza-Klein (KK) mode vector bosons in the framework of two universal extra dimension model, at a future electron-positron collider. Production of the (1,1)-th KK mode of electro-weak vector bosons (B(1,1), W3(1,1)), are considered in association with a hard photon. Without caring about the decay products of those vector bosons, one can measure the masses of these particles just by looking at the photon energy distribution. Once produced these particles dominantly decay to a pair of jets or to a pair of top quarks. Thus we look for a pair of jets or a pair of top quarks in association with a photon. Upto the kinematic limit of the collider, signals from the B(1,1) production and decay in both the above mentioned channels are greater than the $5\sigma$ fluctuation of the Standard Model background. However, the number of events from W3(1,1) production and decay is smaller and its detection prospect is not very good.