نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشکده فیزیک، دانشگاه صنعتی شاهرود
2 Physics Faculty, Shahrood University of Technology, P.O.Box 3619995161 Shahrood, Iran
کلیدواژهها
عنوان مقاله English
نویسندگان English
In this research, we consider Composite Higgs Models with a relatively small global symmetry-breaking scale,
f in the strong coupling sector, where the Higgs boson emerges as a pseudo-Nambu-Goldstone boson. The model also includes a singlet scalar resonance, the sigma particle (σ), which mixes with the Higgs. Using an effective chiral Lagrangian, the structure of the theory's vacuum minima is analyzed. It is shown that in the absence of σ, achieving f scales above 1 TeV requires a small amount of fine-tuning to be consistent with experimental constraints. However, mixing with this light scalar particle resolves this tension and allows for a lower f scale. Subsequently, we impose up-to-date experimental constraints based on combined LHC Run-2 fits on the Higgs couplings to gauge bosons and the top quark. By also applying limits from Higgs exotic decay searches, the model's parameter space is quantitatively determined, and viable benchmark points are extracted. Furthermore, an alternative scenario based on the CDF results is investigated to illustrate the model's sensitivity to independent collider data. The analyses demonstrate that the presence of the light scalar σ can effectively alleviate constraints arising from the electroweak precision parameters S
and T as well as deviations in the Higgs couplings.
کلیدواژهها English
