Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 72: BSM Higgs 3 (extended Higgs sectors)

T 72.5: Talk

Wednesday, March 6, 2024, 17:00–17:15, Geb. 30.41: HS 3

In search for heavy and light scalars with the Higgs boson in the hadronic final state with the ATLAS experiment — •Daariimaa Battulga, Arely Cortes Gonzalez, and Cigdem Issever — Institut für Physik, Humboldt-Universität zu Berlin

One of the most successful theories, the Standard Model (SM) of particle physics, describes the fundamental interactions amongst the subatomic particles. Yet, there are many unexplored areas in new physics beyond the SM. With the Higgs boson discovery, many open questions in particle physics can be explored further, such as searches for an extended Higgs sector, including additional heavy scalars. In this search, a heavy scalar X in a mass range of 1 − 6 TeV decays into a Higgs boson, and the light scalar S, in a mass range of 70 − 500 GeV. Here, with a sufficiently high mass of the scalar X, the scalar S and the Higgs boson are Lorentz-boosted. When it comes to where both the scalar S and the Higgs boson decay into a pair of bottom quarks, they can be reconstructed and identified inside a large-radius jet. This talk presents the status of this search, which employs a new graph neural network to identify jets containing two bottom quarks. This study uses the proton-proton collision data collected by the ATLAS detector with the center of mass energy of √s=13 TeV with an integrated luminosity of L=140 fb⁻¹.

Keywords: Higgs boson; Beyond the standard model; Xbb tagging; Resonant search