Non-minimal universal extra dimensions

Abstract

In this paper we investigate the phenomenological implications of boundary localized terms (BLTs) in the model of Universal Extra Dimensions (UED). In particular, we study the electroweak Kaluza-Klein mass spectrum resulting from BLTs and their effect on electroweak symmetry breaking via the five dimensional Higgs mechanism. We find that the addition of BLTs to massive five dimensional fields induces a non-trivial extra dimensional profile for the zero and non-zero Kaluza-Klein (KK) modes. Hence BLTs generically lead to a modification of Standard Model parameters and are therefore experimentally constrained, even at tree level. We study Standard Model constraints on three representative non-minimal UED models in detail and find that the constraints on BLTs are weak. On the contrary, non-zero BLTs have a major impact on the spectrum and couplings of non-zero KK modes. For example, there are regions of parameter space where the Lightest Kaluza-Klein particle (LKP) is either the Kaluza-Klein Higgs boson or the first KK mode of the W^3.

38 pages, 8 figures, added references, accepted by PRD

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• Status Report on Universal Extra Dimensions After LHC8
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• A note on gauge-fixing in the electroweak sector of nmUED
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• Unitarity Constraints on non-minimal Universal Extra Dimensional Model
• Extra Dimensions at the LHC
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• Mono-top Signature from Fermionic Top-partner
• Spontaneous CP violation, sterile neutrino dark matter, and leptogenesis
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• Belle II Constraints on the Non-Minimal Universal Extra Dimensional Model