SMuK 2023 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 31: Theory Higgs, BMS

T 31.5: Vortrag

Dienstag, 21. März 2023, 18:00–18:15, HSZ/0201

Trilinear Higgs Self-Couplings at O(α_t²) in the CP-Violating NMSSM — •Christoph Borschensky¹, Thi Nhung Dao², Martin Gabelmann³, Margarete Mühlleitner¹, and Heidi Rzehak⁴ — ¹Karlsruhe Institute of Technology, Germany — ²PHENIKAA University, Hanoi, Vietnam — ³DESY, Hamburg, Germany — ⁴Eberhard Karls Universität Tübingen, Germany

In supersymmetric theories the Higgs boson masses are derived quantities where higher-order corrections have to be included in order to match the measured Higgs mass value at the precision of current experiments. Closely related through the Higgs potential are the Higgs self-interactions. In addition, the measurement of the trilinear Higgs self-coupling provides the first step towards the reconstruction of the Higgs potential and the experimental verification of the Higgs mechanism sui generis.

In this talk, I will present the O(α_t²) corrections to the trilinear Higgs self-couplings in the CP-violating Next-to-Minimal Supersymmetric extension of the SM (NMSSM), calculated in the gaugeless limit at vanishing external momenta. The higher-order corrections turn out to be larger than the corresponding mass corrections, but show the expected perturbative convergence. The inclusion of the loop-corrected effective trilinear Higgs self-coupling in gluon fusion into Higgs pairs and the estimate of the theoretical uncertainty due to missing higher-order corrections indicate that the missing electroweak higher-order corrections may be significant.