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5D UED: Flat and Flavorless
High Energy Physics - Phenomenology · Submitted 30 Jun 2010
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim We document a mostly unsuccessful attempt at utilizing localization in a flat extra dimension to resolve these flavor constraints while maintaining KK-parity as a good quantum number.
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The abstract, sentence by sentence
5D UED is not automatically minimally flavor violating. This is due to flavor asymmetric counter-terms required on the branes. Additionally, there are likely to be higher dimensional operators which directly contribute to flavor observables. We document a mostly unsuccessful attempt at utilizing localization in a flat extra dimension to resolve these flavor constraints while maintaining KK-parity as a good quantum number. It is unsuccessful insofar as we seem to be forced to add brane operators in such a way as to precisely mimic the effects of a double throat warped extra dimension. In the course of our efforts, we encounter and present solutions to a problem common to many extra dimensional models in which fields are "doubly localized:" ultra-light modes. Under scrutiny, this issue seems tied to an intrinsic tension between maintaining Kaluza-Klein parity and resolving mass hierarchies via localization.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | 5D UED is not automatically minimally flavor violating. | background 0.59 | 0.26 | 0.43 | asserted 1.00 |
| s1 | This is due to flavor asymmetric counter-terms required on the branes. | background 0.43 | 0.22 | 0.13 | asserted 1.00 |
| s2 | Additionally, there are likely to be higher dimensional operators which directly contribute to flavor observables. | background 0.94 | 0.17 | 0.09 | hedged possibility 1.00 |
| s3 | We document a mostly unsuccessful attempt at utilizing localization in a flat extra dimension to resolve these flavor constraints while maintaining KK-parity as a good quantum number. | contribution 0.63 | 0.94 | 0.27 | asserted 0.98 |
| s4 | It is unsuccessful insofar as we seem to be forced to add brane operators in such a way as to precisely mimic the effects of a double throat warped extra dimension. | limitation 0.65 | 0.91 | 0.40 | asserted 0.51 |
| s5 | In the course of our efforts, we encounter and present solutions to a problem common to many extra dimensional models in which fields are "doubly localized:" ultra-light modes. | contribution 0.81 | 0.90 | 0.07 | asserted 1.00 |
| s6 | Under scrutiny, this issue seems tied to an intrinsic tension between maintaining Kaluza-Klein parity and resolving mass hierarchies via localization. | interpretation 0.93 | 0.78 | 0.33 | hedged possibility 0.81 |
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The paper
Original abstract
5D UED is not automatically minimally flavor violating. This is due to flavor asymmetric counter-terms required on the branes. Additionally, there are likely to be higher dimensional operators which directly contribute to flavor observables. We document a mostly unsuccessful attempt at utilizing localization in a flat extra dimension to resolve these flavor constraints while maintaining KK-parity as a good quantum number. It is unsuccessful insofar as we seem to be forced to add brane operators in such a way as to precisely mimic the effects of a double throat warped extra dimension. In the course of our efforts, we encounter and present solutions to a problem common to many extra dimensional models in which fields are "doubly localized:" ultra-light modes. Under scrutiny, this issue seems tied to an intrinsic tension between maintaining Kaluza-Klein parity and resolving mass hierarchies via localization.
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References
How the literature uses it
13 arXiv papers cite this in 18 sentences
Papers citing it · 9 sentences without a confident label
Cites it as support 1 paper
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Flavor physics dictates them to be proportional to the unit matrix.[In Ref [ref] it has been shown that fermion mass matrices in split-UED induce FCNC's unless the mass matrices are flavor blind, i.e., proportional to the unit matrix in flavor space.
Constraints on UED from W' searches · Non-Minimal Universal Extra Dimensions · 0.96
Cites it as background 7 papers
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Here we provide a brief review on (Split) UED model with the exact KK-parity [ref] following Ref. [ref] , where the model is understood as a low energy effective description of Randall-Sundrum (RS) model.
Bounds on the Fermion-Bulk Masses in Models with Universal Extra Dimensions · Universal Extra Dimensions with bulk fermion masses: split-UED · 0.96
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In minimal UED (MUED) [ref] , the first KK excitation of the photon[Actually the LKP photon ($γ^(1)$) is very close to the KK excitation of the hypercharge gauge boson ($B^(1)$), because the weak mixing angle for the KK states are suppressed by a small factor $(m_W^2/m_KK^2)≪1$ [ref] .] with a mass $M_1=1/R$ is the LKP.[See Refs. [ref] for reviews on universal extra dimensions as well as Refs. [ref] for the most recent LHC bounds on MUED.] The phenomenology of KK DM [ref] becomes much richer when bulk mass terms for fermions [ref] and the boundary localized kinetic terms (BLKTs) [ref] are allowed as in non-minimal UED (NMUED) [ref] .
Electroweak Kaluza-Klein Dark Matter · Introduction · 0.93
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Among other models, especially models with universal extra dimensions (UED) [ref] , where all the Standard Model (SM) particles are allowed to propagate in the extra dimensions, address various theoretical issues such as dark matter [ref] , the number of generations [ref] , and the Yukawa hierarchy problem [ref] .
Phenomenology of Universal Extra Dimensions with Bulk-Masses and Brane-Localized Terms · Introduction · 0.89
What it cites · 29 sentences without a confident label
Uses the method or tool of 1 paper
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Integrating out the KK gluon and performing some Fierz rearrangements of the operators yields the effective Hamiltonian for four fermion interactions [ref] [equation] where $α, β$ are color indices.
The Flavor of the Composite Pseudo-Goldstone Higgs · Contributions to FCNC's · 0.85
Uses data or values from 2 papers
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The overlap integrals for the mixing terms are given by [equation] Therefore, the diagrams contributing to a shift in electroweak precision observables evaluate to: [equation] where we have used the fact that the masses of the hypercharge gauge boson KK-modes are approximately given by $m_n = n π/L$. $Δρ$ is then given by: [equation] Depending on the exact value of the compactification scale $L$, this can be in agreement with the EWP bound of $Δρ≈(0.1 ±0.6) ·10^-3$ [ref] .
Electroweak symmetry breaking after LEP1 and LEP2 · Electroweak precision bounds · 0.82
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The overlap integrals for the mixing terms are given by [equation] Therefore, the diagrams contributing to a shift in electroweak precision observables evaluate to: [equation] where we have used the fact that the masses of the hypercharge gauge boson KK-modes are approximately given by $m_n = n π/L$. $Δρ$ is then given by: [equation] Depending on the exact value of the compactification scale $L$, this can be in agreement with the EWP bound of $Δρ≈(0.1 ±0.6) ·10^-3$ [ref] .
A Combination of Preliminary Electroweak Measurements and Constraints on the Standard Model · Electroweak precision bounds · 0.82
Compares with 1 paper
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[ref] that the off diagonal couplings are given by [equation] This results in an effective suppression of the KK-gluon FCNC contribution [equation] As anticipated, this is the same relation that is obtained in RS models [ref] .
The Flavor of the Composite Pseudo-Goldstone Higgs · Brane-localized operators in 5D UED · 0.95
Cites as background 15 papers
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Specifically, it has been shown that warped geometry provides an automatic built-in GIM mechanism which suppresses tree-level flavor changing neutral currents [ref] .
The Flavor of the Composite Pseudo-Goldstone Higgs · Flavor constraints · 0.83
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Specifically, it has been shown that warped geometry provides an automatic built-in GIM mechanism which suppresses tree-level flavor changing neutral currents [ref] .
Flavor Violation Tests of Warped/Composite SM in the Two-Site Approach · Flavor constraints · 0.83
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Specifically, it has been shown that warped geometry provides an automatic built-in GIM mechanism which suppresses tree-level flavor changing neutral currents [ref] .
A Common Origin for Neutrino Anarchy and Charged Hierarchies · Flavor constraints · 0.83
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