{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.137769.v2","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/2621476"}},{"@id":"https://doi.org/10.1103/PhysRevD.108.052003","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"ATLAS Collaboration"},"creator":{"@type":"Organization","name":"ATLAS Collaboration"},"datePublished":"2025","description":"A search for nonresonant Higgs boson pair production in the $b\\bar{b}b\\bar{b}$ final state is presented. The analysis uses 126 fb$^{-1}$ of $pp$ collision data at $\\sqrt{s}={13}$ TeV collected with the ATLAS detector at the Large Hadron Collider, and targets both the gluon-gluon fusion and vector-boson fusion production modes. No evidence of the signal is found and the observed (expected) upper limit on the cross-section for nonresonant Higgs boson pair production is determined to be 5.4 (8.1) times the Standard Model predicted cross-section at 95% confidence level. Constraints are placed on modifiers to the $HHH$ and $HHVV$ couplings. The observed (expected) $2\\sigma$ constraints on the $HHH$ coupling modifier, $\\kappa_\\lambda$, are determined to be $[-3.5, 11.3]$ ($[-5.4, 11.4]$), while the corresponding constraints for the $HHVV$ coupling modifier, $\\kappa_{2V}$, are $[-0.0, 2.1]$ ($[-0.1, 2.1]$). In addition, constraints on relevant coefficients are derived in the context of the Standard Model effective field theory and Higgs effective field theory, and upper limits on the $HH$ production cross-section are placed in seven Higgs effective field theory benchmark scenarios.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.137769.v2/t1","@type":"Dataset","description":"Distributions of the reconstructed mHH in data (shown by the black points), the estimated background (shown by the yellow histograms)...","name":"Figure 9a"},{"@id":"https://doi.org/10.17182/hepdata.137769.v2/t2","@type":"Dataset","description":"Distributions of the reconstructed mHH in data (shown by the black points), the estimated background (shown by the yellow histograms)...","name":"Figure 9b"},{"@id":"https://doi.org/10.17182/hepdata.137769.v2/t3","@type":"Dataset","description":"The observed 95% CL exclusion limits as a function of κλ (obtained using the signal strength μggF+VBF as the 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