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In universal extra-dimensional models a conserved $Z_2$ parity ensures thestability of the lightest Kaluza-Klein particle, a potential dark-mattercandidate. We show here that boundary-localized kinetic terms, in general, donot preserve this symmetry. We examine the single production of a Kaluza-Kleinexcitation of the photon and its decay to zero-mode fermion-antifermion pairsin the presence of such terms. We explore how experiments at the Large HadronCollider at CERN can help constrain the boundary-localized kinetic terms fordifferent choices of the compactification radius.

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