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A Little Solution to the Little Hierarchy Problem: A Vector-like Generation

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arxiv 0910.3020 v2 pith:RVAZBWLE submitted 2009-10-16 hep-ph

classification hep-ph
keywords generationlittlehierarchyproblemvector-likefourthquarkssolution
verification ladder T0 review T1 audit T2 compute T3 formal
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We present a simple solution to the little hierarchy problem in the MSSM: a vector-like fourth generation. With O(1) Yukawa couplings for the new quarks, the Higgs mass can naturally be above 114 GeV. Unlike a chiral fourth generation, a vector-like generation can solve the little hierarchy problem while remaining consistent with precision electroweak and direct production constraints, and maintaining the success of the grand unified framework. The new quarks are predicted to lie between ~ 300 - 600 GeV and will thus be discovered or ruled out at the LHC. This scenario suggests exploration of several novel collider signatures.

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Forward citations

Cited by 3 Pith papers

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

  1. The curtain lowers on directly detectable higgsino dark matter

    hep-ph 2024-12 accept novelty 5.0 of 10

    Using LZ2024 limits, the paper derives new lower bounds on gaugino masses and upper bounds on higgsino mass splittings in decoupled-MSSM higgsino dark matter scenarios, plus projections for the neutrino fog.

  2. 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.

  3. 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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