Multiple vector-like fermions in SU(5) GUT raise the unification scale to about 10^15.5 GeV, suppress proton decay operators via multiplet admixtures, and relax rigid Yukawa relations to better match observed fermion masses.
Minimal SU(5) GUTs with vectorlike fermions
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With XGBoost at 14 TeV and 3000 fb⁻¹, 2σ exclusion of a tau-mixing singlet vectorlike lepton can reach ~500 GeV (3-lepton) and ~405 GeV (4-lepton) if systematics are negligible.
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Fermion Multiplicities at the GUT Scale: A Statistical Study of Unification and Proton Decay
Multiple vector-like fermions in SU(5) GUT raise the unification scale to about 10^15.5 GeV, suppress proton decay operators via multiplet admixtures, and relax rigid Yukawa relations to better match observed fermion masses.
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Machine learning study on single production of a singlet vectorlike lepton at the Large Hadron Collider
With XGBoost at 14 TeV and 3000 fb⁻¹, 2σ exclusion of a tau-mixing singlet vectorlike lepton can reach ~500 GeV (3-lepton) and ~405 GeV (4-lepton) if systematics are negligible.