A vector-like fourth generation with a discrete symmetry from Split-UED

Abstract

Split-UED allows for the possibility that the lowest lying KK excitations of the Standard Model fermions can be much lighter than the corresponding gauge or Higgs KK states. This can happen provided the fermion bulk masses are chosen to be large, in units of the inverse compactification radius, 1/R, and negative. In this setup, all of the other KK states would be effectively decoupled from low energy physics. Such a scenario would then lead to an apparent vector-like fourth generation with an associated discrete symmetry that allows us to accommodate a dark matter candidate. In this paper the rather unique phenomenology presented by this picture will be examined.

13 pages, 5 figures

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• LHC 750 GeV Diphoton excess in a radiative seesaw model
• Inclusive nonresonant multilepton probes of new phenomena at $\sqrt{s}=$ 13 TeV
• Bounds on the Fermion-Bulk Masses in Models with Universal Extra Dimensions
• Global fits of the Minimal Universal Extra Dimensions scenario
• Electroweak Kaluza-Klein Dark Matter
• Search for single vector-like quarks in ppbar collisions at sqrt(s) = 1.96 TeV
• 5D UED: Flat and Flavorless
• Fourth Generation Parity
• A Review on Non-Minimal Universal Extra Dimensions
• The oblique parameters in the 2HDM with Vector-Like Quarks: Confronting $M_W$ CDF-II Anomaly
• Neutrino dark matter candidate in fourth generation scenarios
• Constraints on split-UED from Electroweak Precision Tests
• Pseudoscalar decays to gauge bosons at the LHC and at a future 100 TeV collider
• Minimal and non-minimal Universal Extra Dimension models in the light of LHC data at 13 TeV
• Stability of the Standard Model Vacuum with Vector-Like Leptons: A Critical Examination
• Search for vector-like leptons coupling to first- and second-generation Standard Model leptons in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Search for vector-like leptons with long-lived particle decays in the CMS muon system in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Constraining Bosonic Supersymmetry from Higgs results and 8 TeV ATLAS multi-jets plus missing energy data
• Investigating the jet activity accompanying the production at the LHC of a massive scalar particle decaying into photons
• Dilepton + jet signature of Split-UED at the LHC