Constraints on models with universal extra dimensions from dilepton searches at the LHC

Edelhäuser, Lisa; Flacke, Thomas; Krämer, M.

doi:10.1007/jhep08(2013)091

Cited by 30 publications

(19 citation statements)

References 39 publications

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“…This should be compared with other constraints which are typically strongest from the oblique electroweak corrections estimated to be around 1=R > 0:8 TeV [15]. The bounds from direct searches at colliders typically lead to subdominant or comparable constraints [16], owing to the relatively compressed mass spectrum within this class of models. Recent LHC Higgs mass bounds can constrain UED from the renormalization group running of the physical parameters [17].…”

Section: Universal Extra Dimensionmentioning

confidence: 97%

Constraining minimal and nonminimal universal extra dimension models with Higgs couplings

Dey

Ray

2013

Phys. Rev. D

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Early indications from the LHC for the observed scalar boson imply properties close to the Standard Model Higgs, putting considerable constraints on TeV scale new physics scenarios. In this paper we consider flat extra dimensional scenarios with the fifth spatial dimension compactified on an S 1 =Z 2 orbifold. We find in the minimal model the experimentally preferred effective Higgs couplings to gluons and photons at 95% confidence level disfavor the new physics scale below 1.3 TeV. We demonstrate that a generalization of these models to include brane localized kinetic terms can relieve the tension to accommodate scales as low as 0.4 TeV.

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Section: Universal Extra Dimensionmentioning

confidence: 97%

Constraining minimal and nonminimal universal extra dimension models with Higgs couplings

Dey

Ray

2013

Phys. Rev. D

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“…Now, for the BLT parameters and R −1 that lead to a larger Γ t→cγ compared to the SM the second level KK particles become much lighter. Clearly, a qualitative comparison with [74] shows that a lighter KK particle implies significant propagator enhancement leading the dilepton cross section to a degree that is ruled out by LHC dilepton data. We have checked that even the modification in couplings via the overlap integrals is not enough to evade these bounds.…”

Section: S T U Parameters Fcnc and Other Issuesmentioning

confidence: 98%

“…Presently the bounds on new physics particles are quite high as can be seen from the exotic particle searches of ATLAS and CMS [72,73]. In the case of mUED, LHC dilepton searches put constraints on second KK level particles to be m KK (2) ≥ 1.4 TeV [74]. Now, for the BLT parameters and R −1 that lead to a larger Γ t→cγ compared to the SM the second level KK particles become much lighter.…”

Section: S T U Parameters Fcnc and Other Issuesmentioning

confidence: 99%

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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“…45 . The dilepton final state can arise from the production of second-level KK states which can decay into SM particles and thus do not result in any missing transverse momentum.…”

Section: Lhc Constraintsmentioning

confidence: 99%

Status report on universal extra dimensions after LHC8

Servant

2015

Mod. Phys. Lett. A

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Although they do not address the hierarchy problem, models with Universal Extra Dimensions have attracted a lot of attention as simple benchmark models characterized by small mass splittings and a dark matter WIMP played by the Lightest Kaluza-Klein particle (LKP). We review their status, with emphasis on the minimal implementation in 5 dimensions (MUED) in which the LKP is a massive hypercharge gauge boson. In this case, the mass range accounting for the correct dark matter abundance (around 1.4 TeV) remains untouched by LHC8 and is out of reach of present DM direct detection experiments. However, LHC14 can probe the relevant region in the 3-lepton channel.

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Constraints on models with universal extra dimensions from dilepton searches at the LHC

Cited by 30 publications

References 39 publications

Constraining minimal and nonminimal universal extra dimension models with Higgs couplings

Constraining minimal and nonminimal universal extra dimension models with Higgs couplings

Rare top decays in minimal and nonminimal universal extra dimension models

Status report on universal extra dimensions after LHC8

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