Constraints on the Higgs boson self-coupling from single- and double-Higgs production with the ATLAS detector using $pp$ collisions at $\sqrt{s}=13$ TeV

Abstract

Constraints on the Higgs boson self-coupling are set by combining double-Higgs boson analyses in the $b\bar{b}b\bar{b}$, $b\bar{b}{\tau }^{+}{\tau }^{-}$ and $b\bar{b}\gamma \gamma$ decay channels with single-Higgs boson analyses targeting the $\gamma \gamma$, $Z{Z}^{\ast }$, $W{W}^{\ast }$, ${\tau }^{+}{\tau }^{-}$ and $b\bar{b}$ decay channels. The data used in these analyses were recorded by the ATLAS detector at the LHC in proton$-$proton collisions at $\sqrt{s}=13$ TeV and correspond to an integrated luminosity of 126$-$139 fb${}^{-1}$. The combination of the double-Higgs analyses sets an upper limit of ${\mu }_{HH}<2.4$ at 95% confidence level on the double-Higgs production cross-section normalised to its Standard Model prediction. Combining the single-Higgs and double-Higgs analyses, with the assumption that new physics affects only the Higgs boson self-coupling (${\lambda }_{HHH}$), values outside the interval $-0.4<{\kappa }_{\lambda }=({\lambda }_{HHH}/{\lambda }_{HHH}^{\text{SM}})<6.3$ are excluded at 95% confidence level. The combined single-Higgs and double-Higgs analyses provide results with fewer assumptions, by adding in the fit more coupling modifiers introduced to account for the Higgs boson interactions with the other Standard Model particles. In this relaxed scenario, the constraint becomes $-1.4<{\kappa }_{\lambda }<6.1$ at 95% CL.

17 pages in total, author list starting page 1, 6 figures, 2 tables, submitted to Phys. Lett. B. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HDBS-2022-03

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• New physics implications of VBF searches exemplified through the Georgi-Machacek model
• Improved constraints on Higgs boson self-couplings with quartic and cubic power dependencies of the cross section
• Constraining the Higgs Potential with Neural Simulation-based Inference for Di-Higgs Production
• Extracting Higgs Self-Coupling Constraints through Triple Higgs Boson Production at Future Hadron Colliders
• Visible GeV ALP from TeV Vector-like Leptons
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• Probing new physics in the Boosted $HH\to b\bar{b}\gamma \gamma$ channel at the LHC
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• Electroweak Higgs boson pair production: Updated inclusive cross sections