{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.165282.v1","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/3065780"}}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"CMS Collaboration"},"creator":{"@type":"Organization","name":"CMS Collaboration"},"datePublished":"2025","description":"This note presents a comprehensive overview and statistical combination of searches for the nonresonant production of Higgs boson pairs (HH) using data from proton-proton collisions collected by the CMS experiment at the LHC from 2016 to 2018 at a centre-of-mass energy of 13 TeV, corresponding to a total integrated luminosity of 138 fb$ ^{-1} $. Upper limits at $95\\%$ confidence level are set on the rate of the HH production. The observed (expected) upper limit on the inclusive production cross section relative to the standard model expectation is found to be 3.5 (2.5). Assuming all other Higgs boson couplings are equal to their values in the standard model, we exclude HH production at $95\\%$ confidence level for values of the Higgs boson trilinear self-coupling modifier $ \\kappa_{\\lambda} $ outside the range between $-$1.39 and 7.02. Similarly, for the coupling modifier $ \\kappa_{2\\mathrm{V}} $ affecting the interaction between two vector bosons and two Higgs bosons, we exclude HH production for values outside the range between 0.62 and 1.42. This work also studies HH production in new physics scenarios, using the Higgs effective field theory parametrisation. An extrapolation of the results to the integrated luminosity expected after the high-luminosity upgrade of the LHC is also presented.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.165282.v1/t1","@type":"Dataset","description":"Values of the effective Lagrangian couplings for the Higgs Effective field theory benchmarks proposed in Ref. [33].","name":"Table 1"},{"@id":"https://doi.org/10.17182/hepdata.165282.v1/t2","@type":"Dataset","description":"Values of the effective Lagrangian couplings for the Higgs Effective field theory benchmarks proposed in Ref. [34].","name":"Table 2"},{"@id":"https://doi.org/10.17182/hepdata.165282.v1/t3","@type":"Dataset","description":"Summary of results for the HH analyses included in this combination. The second column is the observed (expected) 95$\\%$ CL...","name":"Table 3"},{"@id":"https://doi.org/10.17182/hepdata.165282.v1/t4","@type":"Dataset","description":"The 95% CL upper limits on the inclusive signal strength $ r = \\sigma_{HH} /\\sigma_{HH} ^\\text{SM} $ for each channel...","name":"Figure 9"},{"@id":"https://doi.org/10.17182/hepdata.165282.v1/t5","@type":"Dataset","description":"The 95$\\%$ CL upper limits on the VBF signal strength $r_{VBF HH} = \\sigma_{VBF HH}/\\sigma_{VBF HH}^{SM}$ for each channel and...","name":"Figure 10"},{"@id":"https://doi.org/10.17182/hepdata.165282.v1/t6","@type":"Dataset","description":"The 95$\\%$ CL upper limits on the inclusive HH cross section as a function of $\\kappa_\\lambda$. All other couplings are...","name":"Figure 11_a"},{"@id":"https://doi.org/10.17182/hepdata.165282.v1/t7","@type":"Dataset","description":"The 95$\\%$ CL upper limits on the inclusive HH cross section as a function of $\\kappa_{2V}$. All other couplings are...","name":"Figure 11_b"},{"@id":"https://doi.org/10.17182/hepdata.165282.v1/t8","@type":"Dataset","description":"The profile likelihood ratio test statistic $-2\\Delta\\log(L)$ as a function of coupling modifiers $\\kappa_\\lambda$ for the combination of all channels,...","name":"Figure 12_a"},{"@id":"https://doi.org/10.17182/hepdata.165282.v1/t9","@type":"Dataset","description":"The profile likelihood ratio test statistic $-2\\Delta\\log(L)$ as a function of coupling modifiers $\\kappa_{2V}$ for the combination of all channels,...","name":"Figure 12_b"},{"@id":"https://doi.org/10.17182/hepdata.165282.v1/t10","@type":"Dataset","description":"The 68 $\\%$ CL expected contours of $-2\\Delta\\log(L)$ in the ($\\kappa_\\lambda$, $\\kappa_{2V}$) plane for the combination of all channels when...","name":"Figure 13_a [68$\\%$ CL Expected]"},{"@id":"https://doi.org/10.17182/hepdata.165282.v1/t11","@type":"Dataset","description":"The 95$\\%$ CL expected contours of 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The theoretical...","name":"Figure 14"},{"@id":"https://doi.org/10.17182/hepdata.165282.v1/t30","@type":"Dataset","description":"Upper limits on the HH cross section as a function of the $C_2$ coupling modifier. 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