SMuK 2023 – scientific programme

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T: Fachverband Teilchenphysik

T 109: Higgs, Di-Higgs III

T 109.4: Talk

Thursday, March 23, 2023, 16:35–16:50, HSZ/0105

Search for Higgs boson pair production via vector-boson fusion in final states with four b-quarks in the boosted regime using data collected by the ATLAS detector at √s = 13 TeV — •Marcus Vinicius Gonzalez Rodrigues, Janna Katharina Behr, and Kunlin Ran for the ATLAS collaboration — DESY, Hamburg, Germany

Searches targeting Higgs boson pair production via vector-boson fusion (VBF) provide unique access to the coupling of a Higgs boson pair to a vector boson pair (HHVV), and allow to set constraints on theories that predict resonant production of heavy particles that interact directly with the Higgs boson. The ultimate goal of this analysis is to improve the constraints on the HHVV coupling and search for heavy particles produced via VBF. For this purpose we consider the VBF di-Higgs pair production with final states containing four b-quarks in the boosted regime, where a pair of particle showers initiated by b-quarks from the decay of a high transverse momentum Higgs boson produces one single merged large-radius jet.

This analysis relies on data collected by the ATLAS detector at √s = 13 TeV with an integrated luminosity of 139fb⁻¹. To improve the signal vs. background discrimination a Boosted Decision Tree (BDT) is used to define signal regions sensitive to the HHVV coupling, whereas a Parametric BDT is employed to define signal regions targeting resonant production in a wide range of masses. In this presentation the BDT performance will be shown with regard to the HHVV coupling constraints and to the limits on the resonant production.