Bounds on Universal Extra Dimensions

By T. Appelquist, Hsin-Chia Cheng, B. Dobrescu. 2000

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We show that the bound from the electroweak data on the size of extra dimensions accessible to all the standard model elds is rather loose. These \universal" extra dimensions could have a compactication scale as low as 300 GeV for one extra dimension. This is because the Kaluza-Klein number is conserved and thus the contributions to the electroweak observables arise only from loops. The main constraint comes from weak-isospin violation eects. We also compute the contributions to the S parameter and the Zb b vertex. The direct bound on the compactication scale is set by CDF and D0 in the few hundred GeV range, and the Run II of the Tevatron will either discover extra dimensions or else it could signicantly raise the bound on the compactication scale. In the case of two universal extra dimensions, the current lower bound on the compactication scale depends logarithmically on the ultra-violet cuto of the higher dimensional theory, but can be estimated to lie between 400 and 800 GeV. With three or more extra dimensions, the cuto dependence may be too strong to allow an estimate.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/7fedbd16850c7ad6cc6ff80133e950f48c9385ef

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Citations in the corpus

Precise calculation of the relic density of Kaluza-Klein dark matter in universal extra dimensions (2005, background): “A particularly appealing scenario is offered by the so called Universal Extra Dimensions (UED), originally proposed in [3], where all SM particles are allowed to freely propagate into the bulk of one or more extra dimensions.”
TeV symmetry and the little hierarchy problem (2003, background): “The KK-parity prohibits the lowest KK states from contributing to the higher dimensional operators at the tree level, therefore allowing them to be as light as 300 GeV [10, 13].”
Optimized dark matter searches in deep observations of Segue 1 with MAGIC (2013, background): “, [4]), as well as theories with extra dimensions [5], minimal SM extensions [6], and others (for a review see, e.”
Search for squarks and gluinos in events with isolated leptons, jets and missing transverse momentum at $\sqrt{s}=8$ TeV with the ATLAS detector (2015, methodology): “The signal models considered cover simplified [26, 27] and phenomenological SUSY models, as well as a minimal Universal Extra Dimension (mUED) scenario [28, 29].”
Proton stability in grand unified theories, in strings and in branes (2006, background): “Another example, is proton decay in universal extra dimension models where in a class of such models one finds [278] p → + +e− , + + − (Section 6.”
Pinch Technique: Theory and Applications (2009, methodology): “, the Kaluza-Klein modes in models with universal extra dimensions [134–136]) must undergo the PT rearrangement, and be written in the form Π̂NP; for some recent applications of this methodology in various SM extensions, see, e.”
Theoretical constraints on the Higgs effective couplings (2009, methodology): “This class includes models with a fundamental Higgs scalar and a new parity at the TeV scale, such as the R-parity in supersymmetry and KK-parity in extra-dimension [ 10 ].”