KK Parity in Warped Extra Dimension

TL;DR

This paper develops models with KK parity in warped extra dimensions to stabilize dark matter candidates and explores their phenomenological implications, addressing hierarchy and flavor issues in these models.

Contribution

It introduces warped extra dimension models with KK parity, analyzing their stability, dark matter potential, and collider signatures, which are novel compared to previous models without KK parity.

Findings

The UV-IR-UV model is gravitationally unstable.

Additional mechanisms are needed for flavor issues in IR-UV-IR models.

Warped KK parity leads to distinct collider signals.

Abstract

We construct models with a Kaluza-Klein (KK) parity in a five- dimensional warped geometry, in an attempt to address the little hierarchy problem present in setups with bulk Standard Model fields. The lightest KK particle (LKP) is stable and can play the role of dark matter. We consider the possibilities of gluing two identical slices of 5D AdS in either the UV (IR-UV-IR model) or the IR region (UV-IR-UV model) and discuss the model-building issues as well as phenomenological properties in both cases. In particular, we find that the UV-IR-UV model is not gravitationally stable and that additional mechanisms might be required in the IR-UV-IR model in order to address flavor issues. Collider signals of the warped KK parity are different from either the conventional warped extra dimension without KK parity, in which the new particles are not necessarily pair-produced, or the KK parity in flat universal extra dimensions, where each KK level is nearly degenerate in mass. Dark matter and collider properties of a TeV mass KK Z gauge boson as the LKP are discussed.