Two universal extra dimensions and spinless photons at the ILC

TL;DR

This paper explores the phenomenology of two universal extra dimensions at the ILC, focusing on production, decay, and detection prospects of KK particles, especially the spinless photon as a dark matter candidate.

Contribution

It provides detailed calculations of production cross sections and decay channels for (1,0) and (1,1) KK modes, highlighting distinctive signatures of the two extra dimensions model.

Findings

KK-leptons and spinless photon production cross sections computed

Distinctive decay signatures of KK particles identified

Potential for discovering (1,1) KK bosons as resonances

Abstract

We study the ILC phenomenology of (1,0) Kaluza-Klein (KK) modes along two universal extra dimensions compactified on the chiral square. We compute production cross sections of various (1,0) particles at the ILC with sqrt(s)=1 TeV, focusing on decays of KK-leptons and the KK partner of hypercharge gauge boson down to the "spinless photon", which is the lightest KK particle. We contrast this model to one universal extra dimension with KK-photon (spin-1) and supersymmetry with neutralino (spin-1/2) or gravitino (spin-3/2) dark matter. We also investigate the discovery potential for (1,1) KK bosons as s-channel resonances.