SMuK 2023 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 134: Higgs, Di-Higgs IV

T 134.6: Vortrag

Donnerstag, 23. März 2023, 18:45–19:00, HSZ/0105

A model-independent analysis of interference effects in the t t final state at the LHC involving two CP-mixed Higgs bosons — Henning Bahl¹, •Romal Kumar², and Georg Weiglein^2,3 — ¹University of Chicago, Department of Physics and Enrico Fermi Institute, 5720 South Ellis Avenue, Chicago, IL 60637 USA — ²Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany — ³II. Institut für Theoretische Physik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany

Various extensions of the Standard Model predict the existence of additional Higgs bosons. If these additional Higgs bosons are sufficiently heavy, an important search channel is the di-top final state. In this channel interference contributions between the signal and the corresponding QCD background process are expected to be important. If more than one heavy Higgs boson is present, besides the signal-background interference effects associated with each Higgs boson also important signal-signal interference effects are possible. We perform a comprehensive model-independent analysis of the various interference contributions within a simplified model framework considering two heavy Higgs bosons that can mix with each other, taking into account large resonance-type effects arising from loop-level mixing between the scalars. The interference effects are studied both in an analytic way at the parton level and with Monte Carlo simulations for proton-proton collisions at the LHC. The mapping of the general approach to a specific model is demonstrated for the case of a complex Two-Higgs Doublet Model.