Universal Extra-Dimensional models with boundary localized kinetic terms: Probing at the LHC

TL;DR

This paper investigates how boundary-localized kinetic terms in universal extra-dimensional models affect the stability of dark matter candidates and explores how LHC experiments can constrain these boundary effects.

Contribution

It demonstrates that boundary-localized kinetic terms generally break the $Z_2$ symmetry, affecting the production and decay of Kaluza-Klein particles, and proposes experimental constraints from the LHC.

Findings

Boundary-localized kinetic terms can break KK parity.

Single production of KK photon is affected by boundary terms.

LHC data can constrain boundary-localized kinetic parameters.

Abstract

In universal extra-dimensional models a conserved $Z_2$ parity ensures the stability of the lightest Kaluza-Klein particle, a potential dark-matter candidate. We show here that boundary-localized kinetic terms, in general, do not preserve this symmetry. We examine the single production of a Kaluza-Klein excitation of the photon and its decay to zero-mode fermion-antifermion pairs in the presence of such terms. We explore how experiments at the Large Hadron Collider at CERN can help constrain the boundary-localized kinetic terms for different choices of the compactification radius.