Top-color dynamics and the effective gluon-gluon-Higgs operator

2002/01/31 by M. Hashimoto, Michio Hashimoto · 1 citation
Physics and Astronomy · #Black Holes and Theoretical Physics #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex #hep-ph

paper · pdf · doi:10.1103/physrevd.66.095015

published as Phys.Rev. D66 (2002) 095015 · 11 pages, 1 figure, REVTeX; To appear in PRD. Discussion is improved

arxiv created 2002/10/04 · openalex publication_date 2002/11/27 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We discuss the production of the composite Higgs boson in top-color models via the gluon fusion process. We consider the contribution of color-octet massive gauge bosons (colorons) strongly interacting with the top quark, in addition to nonstandard contributions of the top-Yukawa coupling and heavy colored fermions other than the top quark. In order to estimate the contribution of colorons, we derive the low-energy effective theory by eliminating colorons by using the equation of motion for colorons. We replace the composite operator (q_Lt_R)(t_Rq_L) in the effective theory by the composite Higgs operator. We then obtain the effective gluon-gluon-Higgs (ggH) operator induced by colorons and find that its coefficient (A_col) is proportional to m_dyn²/M², where M and m_dyn denote the coloron mass and the mass dynamically generated by colorons, respectively. The contribution of colorons A_col becomes comparable to the top-loop effect A_top for M\ensuremath∼O(1TeV) and m_dyn\ensuremath∼O(0.6TeV). Such a large dynamical mass can be realized in top-seesaw (TSS) models consistently with the experimental value of the top quark mass (m_t^(exp)), while the dynamical mass itself is adjusted to m_t^(exp) in top-color assisted technicolor models (TC2). We find that the coloron contribution A_col can be sizable in a certain class of TSS models: the contribution of colorons (the top loop) is dominant in the real (imaginary) part of the \stackrel\ensuremath→Hgg amplitude for the Higgs boson mass m_H of the order of 1 TeV. On the other hand, enhancement of the top-Yukawa coupling becomes important in TC2. We can observe signatures of the Higgs boson in TC2 with m_H\ensuremath∼200GeV even at the Fermilab Tevatron run II as well as at the CERN LHC. We estimate S/√(B)=3--6 for an integrated luminosity of 2fb^\ensuremath-1 and m_H=190GeV at the Tevatron run II.

Citations

• Dynamical chiral symmetry breaking in gauge theories with extra dimensions
• Dynamical Model of Elementary Particles Based on an Analogy with Superconductivity. I

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