Münster 2017 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 86: Higgs Physik (Theorie) 2
T 86.5: Vortrag
Mittwoch, 29. März 2017, 17:45–18:00, VSH 06
Phenomenology of the 125 GeV Higgs boson in the N2HDM — Margarete Mühlleitner1, Marco O. P. Sampaio2, Rui Santos3,4, and •Jonas Wittbrodt1,5 — 1ITP, KIT, 76128 Karlsruhe, Germany — 2Departamento de Física, Universidade de Aveiro and CIDMA, 3810-183 Aveiro, Portugal — 3ISEL, Instituto Politécnico de Lisboa, 1959-007 Lisboa, Portugal — 4CFTC, Universidade de Lisboa, 1749-016 Lisboa, Portugal — 5DESY, D-22607 Hamburg, Germany
The N2HDM is based on the CP-conserving 2HDM extended by a real scalar singlet field. Its enlarged parameter space and its fewer symmetry conditions as compared to supersymmetric models allow for an interesting phenomenology compatible with current experimental constraints. In this talk, we present the phenomenology of the 125 GeV Higgs boson in this model. We performed a large scan of the N2HDM parameter space which takes into account all applicable theoretical and experimental constraints. In the N2HDM the 125 GeV state can mix with the singlet field. We find that this singlet admixture can be sizeable despite the SM-like behaviour observed at the LHC. We show how the singlet admixture affects the coupling structure and signal strengths of the 125 GeV Higgs boson and analyse how to best constrain it experimentally. Like in the 2HDM, the N2HDM features a wrong-sign regime where the gauge and bottom quark couplings are of opposite sign. We discuss how the correct and wrong sign regimes can be distinguished through measurements of the 125 GeV Higgs properties.