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Bounds on the Fermion-Bulk Masses in Models with Universal Extra Dimensions

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arxiv 1204.0522 v1 pith:E3OZUBGC submitted 2012-04-02 hep-ph

Gui-Yu Huang , Kyoungchul Kong , Seong Chan Park This is my paper · ORCID
classification hep-ph
keywords massesbulkextraboundsmassmodelsuniversaldimension
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In models with extra dimensions, vectorlike Dirac masses for fermion fields are generically allowed. These masses are independent of electroweak symmetry breaking and do not contribute to the known masses for the quarks and leptons. They control the profile of the bulk wave functions, the mass spectra of Kaluza-Klein modes, and interactions that could be tested in experiments. In this article, we study the effects of bulk masses in electroweak precision measurements and in dark matter and collider searches, to set bounds on the bulk mass parameters in models with a flat universal extra dimension, namely, Split-UED. We find the current bound on the universal bulk-mass to be smaller than (0.2-0.3)/R, where R is the radius of the extra dimension. Similar but slightly relaxed bounds are obtained in the non-universal bulk mass case. The LHC is expected to play an important role in constraining the remaining parameter space.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Revisiting Universal Extra-Dimension Model with Gravity Mediated Decays

    hep-ph 2024-12 conditional novelty 5.0 of 10

    Existing LHC data exclude fat-brane mUED compactification scales below about 3 TeV, and ML-tagged searches at 500 fb^-1 could extend the reach to roughly 3.2 to 3.4 TeV.

  2. Searching for vector-like leptons decaying into an electron and missing transverse energy in e$^{+}$e$^{-}$ collisions with $\sqrt{s} = 240$ GeV at the FCC-ee

    hep-ex 2026-04 unverdicted novelty 4.0 of 10

    Monte Carlo projections for FCC-ee at 240 GeV set 95% CL exclusion limits on vector-like lepton mass and Yukawa coupling in a lepton-portal scalar dark-matter scenario if no signal appears.

  3. Single production of singlet vector-like leptons at the ILC

    hep-ph 2024-12 conditional novelty 4.0 of 10

    Projected 5-sigma discovery regions for singlet vector-like leptons at the 1 TeV ILC are derived, covering masses 300-700 GeV and coupling kappa down to about 0.026.

  4. Prospects for probing neutral vector-like leptons via pair production at muon collider

    hep-ph 2026-06 unverdicted novelty 3.0 of 10

    Simulations indicate a 6 TeV muon collider with 4 ab^{-1} can reach >5σ significance for neutral doublet VLLs of 1.3-3 TeV mass using 4j2μ and 2ℓ2μ + missing energy channels under polarized beams.

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