Effective description of brane terms in extra dimensions

Águila, F. del; Pérez-Victoria, M.; Santiago, José

doi:10.1088/1126-6708/2006/10/056

Cited by 37 publications

(29 citation statements)

References 54 publications

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“…For completeness first we describe the general set-up of nmUED with BLTs and as we proceed we point out how to revert to mUED. For a more detailed discussion of the model see [16][17][18][19][20][21][22][23][24][25][26][27][28].…”

Section: Model Descriptionmentioning

confidence: 99%

“…Therefore nmUED has a rich phenomenology compared to the mUED scenario thanks to the presence of the BLT parameters. Some of the recent studies on the phenomenology of the BLTs can be found in [17][18][19][20][21][22][23][24][25][26][27][28]. Now, an important aspect of SM is the absence of flavour changing neutral current (FCNC) interactions at the tree-level.…”

Section: Introductionmentioning

confidence: 99%

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Rare top decays in minimal and nonminimal universal extra dimension models

Dey

Jha

2016

Phys. Rev. D

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The flavour changing decays of the top quark are severely suppressed in the Standard Model by virtue of the Glashow-Iliopoulos-Maiani mechanism. Many beyond Standard Model extensions predict the decay rates at a level that is observable in the LHC. We perform a complete one-loop calculation of the flavour changing top quark decays t → cγ and t → ch in the universal extra dimensional model. Apart from considering the decay rates in the minimal version of the model, we also calculate the rates in the non-minimal scenario where the presence of boundary localised terms interestingly modify the set-up. We find that the decay rates in the minimal variant of the model do not change much from their Standard Model values. In the non-minimal version of this model, these decay rates can be higher for specific choices of the boundary localised parameters for a certain range of inverse compactification radius. But these model parameters lead to Kaluza-Klein particle masses that are in tension with various searches at the LHC.

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Section: Model Descriptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Rare top decays in minimal and nonminimal universal extra dimension models

Dey

Jha

2016

Phys. Rev. D

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“…The former effect is in principle computable within any given model [12,13,14], while the latter is a priori unknown, as its origin lies in the ultraviolet physics above the cut-off scale [14,15,16,17]. A common assumption throughout the existing literature on UED is to ignore any boundary terms at the cut-off scale.…”

Section: B the Nature Of The Dark Matter Particlementioning

confidence: 99%

“…As explained earlier, the assumptions behind MUED can be easily relaxed by allowing nonvanishing boundary terms at the scale Λ [15,16,17,45]. This would modify the KK spectrum and correspondingly change the MUED predictions for the KK relic density.…”

Section: B Relic Density Calculation With Coannihilationsmentioning

confidence: 99%

Kaluza-Klein dark matter: Direct detection vis-a-vis CERN LHC

et al. 2008

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We explore the phenomenology of Kaluza-Klein (KK) dark matter in very general models with universal extra dimensions (UEDs), emphasizing the complementarity between high-energy colliders and dark matter direct detection experiments. In models with relatively small mass splittings between the dark matter candidate and the rest of the (colored) spectrum, the collider sensitivity is diminished, but direct detection rates are enhanced. UEDs provide a natural framework for such mass degeneracies. We consider both 5-dimensional and 6-dimensional non-minimal UED models, and discuss the detection prospects for various KK dark matter candidates: the KK photon γ 1 , the KK Z-boson Z 1 , the KK Higgs boson H 1 and the spinless KK photon γ H . We combine collider limits such as electroweak precision data and expected LHC reach, with cosmological constraints from WMAP, and the sensitivity of current or planned direct detection experiments. Allowing for general mass splittings, we show that neither colliders, nor direct detection experiments by themselves can explore all of the relevant KK dark matter parameter space. Nevertheless, they probe different parameter space regions, and the combination of the two types of constraints can be quite powerful. For example, in the case of γ 1 in 5D UEDs the relevant parameter space will be almost completely covered by the combined LHC and direct detection sensitivities expected in the near future. PACS numbers: 95.35.+d,11.10.Kk,95.30.Cq,14.80.Ly 2

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“…It has been pointed out in [22] that their effect can however be eliminated by suitable field redefinitions (see also [23]). …”

Section: Estimate Of the Cut-off And Loop Correctionsmentioning

confidence: 99%

Electroweak symmetry breaking and precision tests with a fifth dimension

Panico¹,

Serone²,

Wulzer³

2007

Nuclear Physics B

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We perform a complete study of flavour and CP conserving electroweak observables in a slight refinement of a recently proposed five-dimensional model on R 4 × S 1 /Z 2 , where the Higgs is the internal component of a gauge field and the Lorentz symmetry is broken in the fifth dimension.Interestingly enough, the relevant corrections to the electroweak observables turn out to be of universal type and essentially depend only on the value of the Higgs mass and on the scale of new physics, in our case the compactification scale 1/R. The model passes all constraints for 1/R ≥ 4.7 TeV at 90% C.L., with a moderate fine-tuning in the parameters. The Higgs mass turns out to be always smaller than 200 GeV although higher values would be allowed, due to a large correction to the T parameter. The lightest non-SM states in the model are typically colored fermions with a mass of order 1 − 2 TeV.

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Effective description of brane terms in extra dimensions

Cited by 37 publications

References 54 publications

Rare top decays in minimal and nonminimal universal extra dimension models

Rare top decays in minimal and nonminimal universal extra dimension models

Kaluza-Klein dark matter: Direct detection vis-a-vis CERN LHC

Electroweak symmetry breaking and precision tests with a fifth dimension

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