Four generations and Higgs physics

2007/06/26 by Graham D. Kribs, Tilman Plehn, Michael Spannowsky +1 · 364 citations
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #Electroweak interaction #Gauge (firearms) #Gauge boson #Gauge theory #Higgs boson #High-Energy Particle Collisions Research #Large Hadron Collider #Nuclear physics #Observable #Parameter space #Particle physics #Particle physics theoretical and experimental studies #Phenomenology (philosophy) #Physics #Physics beyond the Standard Model #Quantum mechanics #Standard Model (mathematical formulation) #Statistics #Technicolor #hep-ph

paper · pdf · doi:10.1103/physrevd.76.075016

published in Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields 76(7) (American Physical Society) · 11 pages, 7 figures, REVTeX

arxiv created 2007/06/26 · openalex publication_date 2007/10/26 · arxiv updated 2010/04/06 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

In the light of the LHC, we revisit the implications of a fourth generation of chiral matter. We identify a specific ensemble of particle masses and mixings that are in agreement with all current experimental bounds as well as minimize the contributions to electroweak precision observables. Higgs masses between 115--315 (115--750) GeV are allowed by electroweak precision data at the 68% and 95% C.L. Within this parameter space, there are dramatic effects on Higgs phenomenology: production rates are enhanced, weak-boson-fusion channels are suppressed, angular distributions are modified, and Higgs pairs can be observed. We also identify exotic signals, such as Higgs decay to same-sign dileptons. Finally, we estimate the upper bound on the cutoff scale from vacuum stability and triviality.

Citations

• Window on the Higgs boson: Fourth generationb′decays reexamined
• Physics potential and experimental challenges of the LHC luminosity upgrade
• Determining the Structure of Higgs Couplings at the CERN Large Hadron Collider
• Quarks and leptons beyond the third generation
• On the metastability of the Standard Model vacuum
• The discovery of the fourth family at the LHC: what if?
• Model-independent description and Large Hadron Collider implications of suppressed two-photon decay of a light Higgs boson
• Modifications to the properties of the Higgs boson
• Is Vtb≃1?
• Probing the MSSM Higgs sector via weak boson fusion at the LHC
• H→WW as the discovery mode for a light Higgs boson
• Evidence for Production of Single Top Quarks and First Direct Measurement of|Vtb|
• Broadening the Higgs boson with right-handed neutrinos and a higher dimension operator at the electroweak scale
• Review of Particle Physics

Cited by

• The TeraZ Mirage: New Physics Lost in Blind Directions
• Measuring the Higgs sector
• Minimal Lee–Wick extension of the Standard Model
• Collider signals of a composite Higgs in the Standard Model with four generations
• Minimal gauge origin of baryon triality and flavorful signatures at the LHC
• Four generations, Higgs physics, and the MSSM
• H→ γγ beyond the Standard Model
• Measuring the magnitude of the fourth-generationCKM4matrix elementVt′b′at the LHC
• Search for Heavy Bottomlike Quarks Decaying to an Electron or Muon and Jets inpp¯Collisions ats=1.96 TeV
• Properties of the top quark
• Confronting the fourth generation two-Higgs-doublet model with the phenomenology of heavy Higgs bosons
• Searches for Higgs bosons in pp collisions at s=7 and 8 TeV in the context of four-generation and fermiophobic models
• 125 GeV Higgs state in the context of four generations with two Higgs doublets