Collider Phenomenology with Split-UED

TL;DR

This paper explores how Split Universal Extra Dimensions affect collider signals, especially the production of level-2 Kaluza-Klein modes, and discusses their potential to explain cosmic ray positron excesses.

Contribution

It introduces the impact of non-zero fermion bulk masses on collider phenomenology within Split-UED models, highlighting modifications to KK mode couplings and discovery prospects.

Findings

Enhanced dilepton resonance signals at colliders due to fermion mass profiles.

Potential explanation for cosmic ray positron excess via KK mode decays.

Modified coupling behaviors affecting KK mode production and detection.

Abstract

We investigate the collider implications of Split Universal Extra Dimensions. The non-vanishing fermion mass in the bulk, which is consistent with the KK-parity, largely modifies the phenomenology of Minimal Universal Exta Dimensions. We scrutinize the behavior of couplings and study the discovery reach of the Tevatron and the LHC for level-2 Kaluza-Klein modes in the dilepton channel, which would indicates the presence of the extra dimensions. Observation of large event rates for dilepton resonances can result from a nontrivial fermion mass profile along the extra dimensions, which, in turn, may corroborate extra dimensional explanation for the observation of the positron excess in cosmic rays.