Improved Constraints on the Standard Model Higgs Self-Interaction Using a Search for HH → 4b via the Vector-Boson Fusion Production Mode at √S = 13 TeV in 126 fb^-1 of Data Collected by the ATLAS Experiment
A search for di-Higgs production via the Vector Boson Fusion mechanism decaying to 4 bottom quarks is performed using 126 fb−1 of data from Run 2 of ATLAS at √s = 13 TeV. The search was performed in the non-resonant regime, finding an upper bound on the production cross-section for the Standard Model VBF→HH→4b of about 200 times the Standard Model. Constraints are placed on both the HHVV coupling (which determines the W/Z-higgs four-point interaction strength) and HHH Higgs self-coupling scale factors at 95% confidence. The HHVV coupling scaling factor (κ2V ) is constrained to an observed interval between 0.09 and 1.98, with expected constraints of −0.03 < κ2V < 2.10. The HHH Higgs self-coupling scale factor (κλ ) is constrained with observed limits −10.1 < κλ < 13.3 and expected limits of −11.6 < κλ < 14.9. No significant excess of events beyond the primarily multi-jet background is measured.
Dr. Stephen Sekula
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Milke, Christopher, "Improved Constraints on the Standard Model Higgs Self-Interaction Using a Search for HH → 4b via the Vector-Boson Fusion Production Mode at √S = 13 TeV in 126 fb^-1 of Data Collected by the ATLAS Experiment" (2022). Physics Theses and Dissertations. 14.
Available for download on Saturday, July 22, 2023