ATLAS searches for di-Higgs production at 13 TeV and prospects for HL-LHC. (29th June 2020)

• Record Type: Journal Article
• Authors: Sano, Y
• Other Names: collab.
• Is Part Of: Physica scripta. Volume 95:Number 8(2020)
• Publication Date: 2020-06-29
• Subjects: ATLAS -- di-Higgs production -- LHC; Physics -- Periodicals; 530.05
• DOI: 10.1088/1402-4896/ab9f78
• Languages: English
• ISSNs: 0031-8949

Abstract

Abstract: The latest results on production of Higgs boson pairs at 13 TeV by the ATLAS experiment at LHC are reported, including a combination of six different decay modes. Results include b b ̄ τ − τ +, b b ̄ b b ̄, b b ̄ γ γ, b b ̄ WW, WWWW and WW γ γ final states, and they are interpreted both in terms of sensitivity to the SM and as limits on κ λ, a scaling of the triple-Higgs interaction strength. The most stringent constraint on di-Higgs production cross-section is set at 6.9 times SM cross-section and κ λ is constrained in the range −5–12 at 95% confidence level. A new search dedicated to the Vector-Boson-Fusion production was performed in the b b ̄ b b ̄ final state. No significant excess, relative to the background-only Standard Model expectation, is observed and interpretation in terms of the coupling between a Higgs boson pair and two vector bosons is also provided: coupling values normalized to the Standard Model expectation of κ 2 V < − 0.56 and 2.89 < κ 2 V are excluded at the 95% confidence level. Future prospects of testing the Higgs self-couplings at the High Luminosity LHC are also reported.