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T: Fachverband Teilchenphysik

T 84: Theorie: BSM II

T 84.7: Vortrag

Donnerstag, 22. März 2018, 18:00–18:15, Z6 - SR 1.010

Electroweak Phase Transition in the N2HDM — •Jonas Müller, Margarete Mühlleitner, and Philipp Basler — Karlsruher Institut für Technologie, ITP, Karlsruhe, Deutschland

While in the Standard Model (SM) it is not possible to generate the observed matter-antimatter asymmetry of the universe through baryogenesis, extended Higgs sectors are more promising in this respect. We investigate the prospects for a strong first order electroweak phase transition (PT) in the Next-to-Two-Higgs Doublet Model (N2HDM) where the CP-conserving Two-Higgs-Doublet Model is extended by an additional real singlet. We consider the N2HDM type I and II where one of the three neutral CP-even Higgs bosons can be the SM-like Higgs boson. By taking into account all relevant theoretical and experimental constraints, we investigate the implications of the requirement of a strong PT for LHC phenomenology. We find preferred mass configurations for the non SM-like Higgs bosons and show the implications on the signal rates of the SM-like Higgs boson. We furthermore highlight the interplay between the strong PT and the size of the trilinear Higgs self-couplings.