Improved sphaleron decoupling condition and the Higgs coupling constants in the real singlet-extended standard model

2014/06/30 by Kaori Fuyuto, Eibun Senaha · 1 citation
Physics and Astronomy · #Coupling (piping) #Decoupling (probability) #Electroweak interaction #Fermion #Gauge (firearms) #Higgs boson #Higgs field #High-Energy Particle Collisions Research #Materials science #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum electrodynamics #Sphaleron #Standard Model (mathematical formulation) #Vacuum expectation value #hep-ph

paper · pdf · doi:10.1103/physrevd.90.015015

published as Phys. Rev. D 90, 015015 (2014) · 25 pages, 11 figures

openalex publication_date 2014/07/14 · arxiv created 2014/07/27 · arxiv updated 2014/07/29 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We improve the sphaleron decoupling condition in the real singlet-extended standard model (SM). The sphaleron energy is obtained using the finite-temperature one-loop effective potential with daisy resummation. For moderate values of the model parameters, the sphaleron decoupling condition is found to be v_C/T_C>(1.1\ensuremath-1.2), where T_C denotes a critical temperature and v_C is the corresponding vacuum expectation value of the doublet Higgs field at T_C. We also investigate the deviation of the triple Higgs boson coupling from its standard model value in the region where the improved sphaleron decoupling condition is satisfied. As a result of the improvement, the deviation of the triple Higgs boson coupling gets more enhanced. In a typical case, if the Higgs couplings to the gauge bosons/fermions deviate from the SM values by about 3 (10)%, the deviation of the triple Higgs boson coupling can be as large as about 16 (50)%, which is about 4 (8)% larger than that based on the conventional criterion v_C/T_C>1.

Citations

• Real Higgs singlet and the electroweak phase transition in the standard model
• Review of Particle Physics
• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Electroweak Baryogenesis and Standard Model CP Violation
• New physics effect on the Higgs self-coupling
• Progress in Electroweak Baryogenesis
• Standard Model CP-violation and Baryon asymmetry
• Radiative Corrections as the Origin of Spontaneous Symmetry Breaking
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• CP-Violation in the Renormalizable Theory of Weak Interaction
• On anomalous electroweak baryon-number non-conservation in the early universe
• Electroweak baryogenesis

Cited by

• Electroweak sphaleron with dimension-six operators

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