The Phenomenology of a Top Quark Seesaw Model

Abstract

The top quark seesaw mechanism offers a method for constructing a composite Higgs field without the usual difficulties that accompany traditional technicolor or topcolor theories. The focus of this article is to study the phenomenology of the new physics required by this mechanism. After establishing a set of criteria for a plausible top quark seesaw theory, we develop two models, the first of which has a heavy weak singlet fermion with hypercharge 4/3 while the second has, in addition, a heavy weak singlet hypercharge -2/3 fermion. At low energies, these theories contain one or two Higgs doublets respectively. We then derive the low energy effective Higgs potential in detail for the two-doublet theory as well as study the likely experimental signatures for both theories. A strong constraint on the one-doublet model is the measured value of the rho parameter which permits the new heavy fermion to have a mass of about 5-7 TeV, when the Higgs has a mass greater than 300 GeV. In the two-doublet model, mixing of the new heavy Y=-2/3 fermion and the b quark affects the prediction for R_b. In order to agree with the current limits on R_b, the mass of this fermion should be at least 12 TeV. The mass of the heavy Y=4/3 fermion in the two-doublet model is not as sharply constrained by experiments and can be as light as 2.5 TeV.

33 pages, 12 figures, uses harvmac and pictex

Cited by in corpus (32)

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• Single Top Production as a Window to Physics Beyond the Standard Model
• Electroweak Precision Constraints on the Littlest Higgs Model with T Parity
• Little Higgs and Custodial SU(2)
• Top Quark Seesaw, Vacuum Structure and Electroweak Precision Constraints
• How Can a Heavy Higgs Boson be Consistent with the Precision Electroweak Measurements?
• New Topflavor Models with Seesaw Mechanism
• A Three Site Higgsless Model
• Smoking-gun signatures of little Higgs models
• The Intermediate Higgs
• A Composite Little Higgs Model
• Electroweak Symmetry Breaking and Extra Dimensions
• Dynamical Electroweak Breaking and Latticized Extra Dimensions
• Role of Present and Future Atomic Parity Violation Experiments in Precision Electroweak Tests
• Minimal Composite Higgs Model with Light Bosons
• Prospects for top-prime quark discovery at the Tevatron
• Weak-Singlet Fermions: Models and Constraints
• Limits on a Composite Higgs Boson
• Precision Electroweak Observables in the Minimal Moose Little Higgs Model
• Vector Leptons in the Higgs Triplet Model
• Multi-lepton signals from the top-prime quark at the LHC
• Higgs Boson Decay into Hadronic Jets
• Fine-tuning in gauge mediated supersymmetry breaking models and induced top Yukawa coupling
• Induced top Yukawa coupling and suppressed Higgs mass parameters
• Top Seesaw with a Custodial Symmetry, and the 126 GeV Higgs
• LHC signatures of vector-like quarks
• Probing Heavy Higgs Boson Models with a TeV Linear Collider
• Third Generation Seesaw Mixing with new Vector-Like Weak-Doublet Quarks
• Measuring CP-Violating Observables in Rare Top Decays at the LHC
• The State of the Standard Model
• Phenomenology of extra quarks at the LHC
• Unscrambling New Models for Higher-Energy Physics