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PreprintCC BY 4.0arXiv

Flavour Chains at the TeV Edge

  • Admir Greljo
  • Xavier Ponce Díaz
  • Lia Schöneweiß
Open at sourcePDFDOICite

Abstract

We study chains of vector-like fermions that generate the Yukawa hierarchies as products of small mixings, with the Higgs coupled at a single link. Minimal Flavour Protection allows these flavour messengers to live at the TeV scale, while Higgs naturalness offers a reason to place them there: in cosmological solutions based on Higgs criticality, their large multiplicity lowers the critical point of the Higgs potential to the TeV scale. Crucially, the same Higgs interactions induce tree-level shifts in the Z and W couplings of light fermions. Existing LEP and SLD measurements already bound MF/|yF|≳ 3 TeV, while a future Tera-Z factory such as FCC-ee could probe up to $100$ TeV. It would test the parameter space most relevant to Higgs naturalness, reaching scenarios with Higgs-mass tuning at the level of 10−4 or worse in minimal realisations. Longer chains partially alleviate this tuning but do not eliminate it, making a Tera-Z factory a decisive test of the framework.

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Cite

BibTeXRIS
BibTeX
@misc{greljo2026flavour,
  title = {{Flavour Chains at the TeV Edge}},
  author = {Admir Greljo and Xavier Ponce Díaz and Lia Schöneweiß},
  howpublished = {arXiv},
  year = {2026},
  month = nov,
  doi = {10.48550/arxiv.2611.05464},
  eprint = {2611.05464},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2611.05464},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Flavour Chains at the TeV Edge
AU  - Admir Greljo
AU  - Xavier Ponce Díaz
AU  - Lia Schöneweiß
PY  - 2026
DA  - 2026/11/03
PB  - arXiv
DO  - 10.48550/arxiv.2611.05464
UR  - https://arxiv.org/abs/2611.05464
AB  - We study chains of vector-like fermions that generate the Yukawa hierarchies as products of small mixings, with the Higgs coupled at a single link. Minimal Flavour Protection allows these flavour messengers to live at the TeV scale, while Higgs naturalness offers a reason to place them there: in cosmological solutions based on Higgs criticality, their large multiplicity lowers the critical point of the Higgs potential to the TeV scale. Crucially, the same Higgs interactions induce tree-level shifts in the Z and W couplings of light fermions. Existing LEP and SLD measurements already bound M_F/|y_F|≳ 3 TeV, while a future Tera-Z factory such as FCC-ee could probe up to $100$ TeV. It would test the parameter space most relevant to Higgs naturalness, reaching scenarios with Higgs-mass tuning at the level of 10^−4 or worse in minimal realisations. Longer chains partially alleviate this tuning but do not eliminate it, making a Tera-Z factory a decisive test of the framework.
ER  -