2014/01/01 by Antonio Dobado, Rafael L. Delgado, Felipe J. Llanes-Estrada +1 · 4 citations
Physics and Astronomy · #Amplitude #Black Holes and Theoretical Physics #Boson #Cosmology and Gravitation Theories #Electroweak interaction #Gauge boson #Gauge theory #Goldstone boson #Higgs boson #Higgs field #Higgs mechanism #Higgs sector #Particle physics #Particle physics theoretical and experimental studies #Physics #Physics beyond the Standard Model #Quantum mechanics #Renormalization #Scalar (mathematics) #Scattering amplitude #Spontaneous symmetry breaking #Symmetry breaking #Technicolor #Unitarity #hep-ph
paper · pdf · doi:10.1063/1.4891127
published in AIP conference proceedings, 151-158 (American Institute of Physics) · Delivered at the II Russian-Spanish Congress "Particle and Nuclear Physics at all Scales and Cosmology" Institute of Cosmos Sciences, Saint-Petersburg, October 1-4, 2013. To be published (AIP proc.)
openalex publication_date 2014/01/01 · arxiv created 2014/02/04 · arxiv updated 2015/04/17 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The apparent finding of a 125-GeV light Higgs boson closes unitarity of the minimal Standard Model (SM), that is weakly interacting: this is an exceptional feature not generally true if new physics exists beyond the mass gap found at the LHC up to 700 GeV. Such new physics induces departures of the low-energy dynamics for the minimal electroweak symmetry-breaking sector, with three Goldstone bosons (related to longitudinal W bosons) and one light scalar, from the SM couplings. We calculate the scattering amplitudes among these four particles and their partial-wave projections in effective theory. For this we employ the Electroweak Chiral Lagrangian extended by one light scalar and carry out the complete one-loop computation at high energy including the counterterms needed for perturbative renormalization, of dimension eight. For most of parameter space, the scattering is strongly interacting (with the SM a remarkable exception). We therefore explore various unitarization methods, that can already be applied to the tree-level WL WL amplitude; we find and study a natural second sigma-like scalar pole there.