Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 36: Higgs Boson: Extended Models 1

T 36.2: Vortrag

Dienstag, 22. März 2022, 16:30–16:45, T-H21

Exotic Higgs Decays: ATLAS Search for Higgs Decays to Two Light Scalars — •Judith Höfer, Claudia Seitz, Rickard Ström, and Beate Heinemann — DESY, Hamburg, Germany

Extensions of the SM Higgs sector featuring one or several singlet scalar fields are realised in many BMS models. While several searches have been performed targeting decays of the SM Higgs boson to two light spin-zero particles of the same mass, the decay to two new scalars of different mass is largely unexplored. The successive decays of these particles can give rise to spectacular high-multiplicity collider signatures, including so-called cascade decays, where the heavier of the scalars decays into the lighter one. The talk discusses an analysis searching for scalar decays to multi-b final states with the ATLAS experiment at the Large Hadron Collider, CERN. The analysis focuses on the ZH production mode and the channel where the scalars decay to b-quarks, resulting in a challenging low-pT jet final state. These signatures motivate the use of many novel reconstruction techniques, such as the reconstruction of soft secondary vertices, a newly developed low-pT X->bb tagger, and an event hypothesis neural network to accurately identify the Higgs decay to the light scalars among the reconstructed objects.