Göttingen 2025 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 3: Higgs Physics II (BSM Higgs)

T 3.2: Vortrag

Montag, 31. März 2025, 17:00–17:15, ZHG105

Planck Safe Phase Transitions in a Complex Singlet Model — •Moritz Bosse and Gudrun Hiller — TU Dormund University, Dortmund, Germany

In this work, we investigate the implications of Beyond the Standard Model Higgs portal couplings on vacuum metastability and strong first-order electroweak phase transitions (SFOEWPT), which are necessary for electroweak baryogenesis. The analysis focuses on the minimal but phenomenologically rich complex singlet model (CxSM) that also provides potential dark matter candidates. It is shown that portal couplings allow for the stabilization of the vacuum up to the Planck scale while simultaneously enhancing the strength of the phase transition to become a SFOEWPT. By adopting Planck safety as a guiding principle for bottom-up model building, we derive new bounds for different dark matter scenarios compatible with SFOEWPTs. The results show that there is significant parameter space available for Planck-safe phase transitions in the CxSM and we explore how this parameter space can be probed at the LHC and beyond.

Keywords: Electroweak Baryogenesis; Phase Transitions; Planck Safety; Vacuum Stability; Singlet Models