Implications of the Stability and Triviality Bounds on the Standard Model with Three and Four Chiral Generations
| Autor: | Akin Wingerter |
|---|---|
| Přispěvatelé: | Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: |
Quark
Physics Nuclear and High Energy Physics Particle physics 010308 nuclear & particles physics Physics beyond the Standard Model High Energy Physics::Lattice High Energy Physics::Phenomenology FOS: Physical sciences Elementary particle 7. Clean energy 01 natural sciences Triviality Standard Model High Energy Physics - Phenomenology High Energy Physics - Phenomenology (hep-ph) [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph] 0103 physical sciences Higgs boson Grand Unified Theory High Energy Physics::Experiment 010306 general physics Boson |
| Zdroj: | Physical Review D Physical Review D, American Physical Society, 2011, 84, pp.095012. ⟨10.1103/PhysRevD.84.095012⟩ |
| ISSN: | 1550-7998 1550-2368 |
| DOI: | 10.1103/PhysRevD.84.095012⟩ |
| Popis: | We revisit the stability and triviality bounds on the Higgs boson mass in the context of the standard model with three and four generations (SM3 and SM4, respectively). In light of the recent results from LHC, the triviality bound in the SM3 has now become obsolete, and the stability bound implies for a Higgs mass of e.g. ${m}_{H}=115\text{ }\text{ }\mathrm{GeV}$ the onset of new physics before $\ensuremath{\Lambda}=650\text{ }\text{ }\mathrm{TeV}$, whereas there are no limits for ${m}_{H}\ensuremath{\ge}133\text{ }\text{ }\mathrm{GeV}$. For the SM4, the stability and triviality curves intersect and bound a finite region. As a consequence, the fourth generation fermions place stringent theoretical limits on the Higgs mass, and there is a maximal scale beyond which the theory cannot be perturbatively valid. We find that the Higgs mass cannot exceed 700 GeV for any values of the fourth generation fermion masses. Turning the argument around, the absence of a Higgs signal for ${m}_{H}\ensuremath{\le}600\text{ }\text{ }\mathrm{GeV}$ excludes a fourth generation with quark masses below 300 GeV and lepton masses below 350 GeV. In particular, the quark bounds also hold for the small mixing scenarios for which the direct limits from Tevatron and LHC are not applicable, and the lepton bounds we obtain are stronger than the collider limits. If a Higgs boson lighter than 700 GeV is not observed, a fourth generation of chiral fermions with perturbative Yukawa couplings will be conclusively excluded for the full range of parameters. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|