Scalar Decay Constant and Yukawa Coupling in Walking Gauge Theories
arXiv:1103.5576 · doi:10.1103/PhysRevD.83.096003
Abstract
We propose an approach for the calculation of the yukawa coupling through the scalar decay constant and the chiral condensate in the context of the extended technicolor (ETC). We perform the nonperturbative computation of the yukawa coupling based on the improved ladder Schwinger-Dyson equation. It turns out that the yukawa coupling can be larger or smaller than the standard model (SM) value, depending on the number of the weak doublets for each technicolor (TC) index. It is thus nontrivial whether or not the huge enhancement of the production of the scalar via the gluon fusion takes place even for a walking TC model with a colored techni-fermion. For the typical one-family TC model near conformality, it is found that the yukawa coupling is slightly larger than the SM one, where the expected mass of the scalar bound state is around 500 GeV. In this case, the production cross section via the gluon fusion is considerably enhanced, as naively expected, and hence such a scalar can be discovered/excluded at the early stage of the LHC.
arXiv comment8 pages, 1 figure, typos are corrected. Version to appear in PRD
References in corpus (26)
- Strong Dynamics and Electroweak Symmetry Breaking
- Topcolor Assisted Technicolor
- Light scalar at LHC: the Higgs or the dilaton?
- Four Generations and Higgs Physics
- Light Composite Higgs from Higher Representations versus Electroweak Precision Measurements -- Predictions for LHC
- Quarks and Leptons Beyond the Third Generation
- Extra Families, Higgs Spectrum and Oblique Corrections
- Four Statements about the Fourth Generation
- Can the QCD running coupling have a causal analyticity structure?
- Precision Constraints on Extra Fermion Generations
- A Light Dilaton in Walking Gauge Theories
- Holographic Estimate of Oblique Corrections for Technicolor
- Techni-dilaton at Conformal Edge
- Relations between Observables and the Infrared Fixed-Point in QCD
- Constraints on Mass Spectrum of Fourth Generation Fermions and Higgs Bosons
- Behavior of the S Parameter in the Crossover Region Between Walking and QCD-Like Regimes of an SU(N) Gauge Theory
- Top Mode Standard Model with Extra Dimensions
- Holographic Techni-dilaton
- Parameter in the Holographic Walking/Conformal Technicolor
- Meson masses in large Nf QCD from the Bethe-Salpeter equation
- pi^+ - pi^0 mass difference and S parameter in the large N_f QCD
- Z Boson Propagator Correction in Technicolor Theories with ETC Effects Included
- Dynamical chiral symmetry breaking in gauge theories with extra dimensions
- Quest for the Dynamical Origin of Mass - An LHC perspective from Sakata, Nambu and Maskawa
- The Higgs Boson Mass and Ward-Takahashi Identity in Gauged Nambu-Jona-Lasinio Model
- Topped MAC with extra dimensions?