Karlsruhe 2024 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 70: Di-Higgs 2 (4b & other)

T 70.6: Vortrag

Mittwoch, 6. März 2024, 17:15–17:30, Geb. 30.41: HS 1

Study of di-Higgs couplings in the multi-lepton channel with the ATLAS detector — •Janek Both, Volker Büscher, Christian Schmitt, and Duc Bao Ta — Johannes Gutenberg-University, Mainz

While numerous predictions about the Higgs boson have been tested after its discovery at the LHC, the functional form of the Higgs potential remains largely undetermined. After electroweak symmetry breaking, the Higgs potential gives rise to cubic and quartic terms in the Higgs field, inducing a self-coupling that can be probed experimentally in Higgs pair production. Due to the small cross-section, di-Higgs processes have mainly been studied in decay channels with high branching ratio in the past. However, with increasing data size, multi-lepton channels will become more important, as they are less affected by background processes than the established analyses. In view of small signal rates, refined and sophisticated analysis strategies are required to increase the sensitivity of these channels.

In this talk, an analysis of the HH → WWWW → 3 ℓ + X process with the ATLAS detector is presented. By taking into account the distribution of the invariant di-Higgs mass, the event selection can be optimized depending on the assumption about the trilinear self-coupling and di-Higgs couplings in the Higgs Effective Field Theory. The expected sensitivity to di-Higgs couplings after Run 3 and at the HL-LHC are presented.

Keywords: ATLAS; Di-Higgs; Higgs self-coupling; Higgs Effective Field Theory