2013/04/30 by A. E. Cárcamo Hernández, Claudio Dib, Claudio O. Dib +1 · 23 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Effective field theory #Electroweak interaction #Higgs boson #Lambda #Observable #Particle physics #Particle physics theoretical and experimental studies #Photon #Physics #Physics beyond the Standard Model #Quantum mechanics #Standard Model (mathematical formulation) #Symmetry breaking #hep-ph
paper · pdf · doi:10.1140/epjc/s10052-014-2822-6
published in The European Physical Journal C 74(4) (Springer Science+Business Media) · 30 pages, 10 figures. Version for publication in European Physical Journal C
openalex publication_date 2014/04/01 · arxiv created 2014/04/08 · arxiv updated 2015/06/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
In scenarios of strongly coupled electroweak symmetry breaking, heavy composite particles of different spin and parity may arise and cause observable effects on signals that appear at loop levels. The recently observed process of Higgs to γ γ at the LHC is one of such signals. We study the new constraints that are imposed on composite models from H→ γ γ , together with the existing constraints from the high precision electroweak tests. We use an effective chiral Lagrangian to describe the effective theory that contains the Standard Model spectrum and the extra composites below the electroweak scale. Considering the effective theory cutoff at Λ = 4π v ∼ 3\text TeV , consistency with the T and S parameters and the newly observed H→ γ γ can be found for a rather restricted range of masses of vector and axial-vector composites from 1.5 to 1.7 and 1.8 to 1.9 TeV, respectively, and only provided a non-standard kinetic mixing between the W3 and B0 fields is included.