SMuK 2023 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 57: Single Top – Higgs Top

T 57.6: Vortrag

Mittwoch, 22. März 2023, 17:05–17:20, HSZ/0101

CP-violation, Asymmetries and Interferences in ttphi — •Duarte Azevedo^1,2, Rodrigo Capucha³, António Onofre⁴, and Rui Santos^3,5 — ¹Institute for Theoretical Physics, Karlsruhe Institute of Technology, 76128 Karlsruhe, Germany — ²Institute for Astroparticle Physics, Karlsruhe Institute of Technology, 76344 Karlsruhe, Germany — ³Centro de Fisica Teórica e Computacional, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, Edificio C8 1749-016 Lisboa, Portugal — ⁴Departamento de Fisica , Universidade do Minho, 4710-057 Braga, Portugal — ⁵ISEL - Instituto Superior de Engenharia de Lisboa, Instituto Politécnico de Lisboa 1959-007 Lisboa, Portugal

We present the results of our paper, where we use the associated production of top-quark pairs (t\bar{t}\phi) with a generic scalar boson (\phi) at the LHC (pp \to t\bar{t}\phi) to explore the sensitivity of a large set of observables to the sign of the CP mixing angle (\alpha), present in the coupling between the scalar boson and the top quarks.

The mass of the scalar boson is set to m_\phi = 125 GeV (the Standard Model Higgs boson mass) and its coupling to top-quarks is varied such that \alpha = 0, 22.5, 45.0, 67.5, 90.0, 135.0 and 180.0. Dileptonic final states of the t\bar{t}\phi system are used, where the scalar boson is set to decay as \phi \to b\bar{b}.

The most sensitive CP-observables are selected to compute Confidence Level (CL) limits as a function of the sign of the top quark Yukawa couplings to the \phi boson.