Parts | Days | Selection | Search | Updates | Downloads | Help

T: Fachverband Teilchenphysik

T 92: Higgs Boson: Extended Models 3

T 92.5: Talk

Thursday, March 24, 2022, 17:15–17:30, T-H23

Z₂ Non-Restoration and Composite Higgs: Singlet-Assisted Baryogenesis w/o Topological Defects — Andrei Angelescu, Florian Goertz, and •Aika Tada — Max-Planck-Institut für Kernphysik, Heidelberg

Simple scalar extensions of the Standard Model with a spontaneously broken Z₂ symmetry allow for a strongly first order electroweak phase transition, as sought in order to realize electroweak baryogenesis. To circumvent the emergence of phenomenologically problematic domain walls often encountered in this context, in 2112.12087 (A. Angelescu, F. Goertz, AT), a scalar singlet framework featuring a thermal history which does not restore Z₂ in the early universe is proposed. This can be realized in a low energy effective theory with D>4 operators. A possible UV completion is provided by a SO(6)/SO(5) Composite Higgs model with fermions in a symmetric 20^′ of SO(6), where the potential and the Yukawa terms are obtained by spurion analysis and a CP violating term arises. Matching the two models and exploring them numerically shows that this scenario can fulfil all Sakharov criteria needed for electroweak baryogenesis.