{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.171917.v1","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/3150543"}}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"CMS Collaboration"},"creator":{"@type":"Organization","name":"CMS Collaboration"},"datePublished":"2026","description":"Measurements of Higgs boson pair (HH) production in the four bottom quark (4b) final state are presented using proton-proton (pp) collision data at ${\\sqrt{s}=13.6 TeV}$ collected by the CMS experiment at the CERN LHC, corresponding to an integrated luminosity of 62 $fb^{-1}$. Events in which the Higgs boson decays, H $\\rightarrow$ bb, are separately reconstructed as pairs of small-radius jets (resolved), as well as those where they are reconstructed as single large-radius jets (merged), are studied exclusively. Benefiting from new methods in trigger selection, event selection, and signal extraction, the combination of analyses in the resolved and merged topologies gives an observed (expected) upper limit on the HH signal strength, $\\mu_{HH}$, of 4.4 (4.4) at 95% confidence level (CL). Compared to previously published LHC results in the 4b final state, the expected limit with an equivalent integrated luminosity is improved by more than a factor of two in the resolved topology and is better in the merged topology as well. An updated analysis of the resolved topology using 138 $fb^{-1}$ of 13 TeV $pp$ collision data yields an observed (expected) 95% CL upper limit on $\\mu_{HH}$ of 10.0 (5.9), an improvement of about 25% in the expected limit compared to the published results using the same data. Results in the 4b final state with 13 and 13.6 TeV are combined, resulting in an observed (expected) 95% CL upper limit on $\\mu_{HH}$ of 4.7 (2.8). The allowed ranges for the Higgs boson trilinear self-coupling and quartic coupling between two Higgs bosons and two vector bosons are also reported. These are the most stringent constraints achieved in the 4b final state to date.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t1","@type":"Dataset","description":"The b tagging performance of the Run 3 PNet@HLT algorithm (in blue) compared to the best performing algorithm deployed at...","name":"Figure 2-a"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t2","@type":"Dataset","description":"Efficiencies of the triggers targeting the resolved HH$\\rightarrow$bbbb topology as functions of the generator-level $M_{HH}$ in simulated SM HH$\\rightarrow$bbbb signal...","name":"Figure 2-b"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t3","@type":"Dataset","description":"Distribution of the SM HH$\\rightarrow$bbbb signal at $\\sqrt{s}=13.6$ TeV prior to any selections, scaled by an arbitrary constant for visibility.","name":"Figure 2-b (Signal distribution before HLT 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GloParT"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t11","@type":"Dataset","description":"The mass regression performance for GloParT and ParticleNet for jets with $p_{T} > 200$ GeV, $|\\eta| < 2.4$, and satisfying...","name":"Figure 5b"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t12","@type":"Dataset","description":"Comparison between data and fit prediction from a simultaneous signal-plus-background fit to the GloParT regressed jet mass distributions in Z$\\rightarrow$...","name":"Figure 6a"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t13","@type":"Dataset","description":"Comparison between data and fit prediction from a simultaneous signal-plus-background fit to the GloParT regressed jet mass distributions in Z$\\rightarrow$...","name":"Figure 6b"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t14","@type":"Dataset","description":"Comparison between data and fit prediction from a simultaneous signal-plus-background fit to the $m_{\\mu\\mu}$ jet mass 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of all 4b validation regions in...","name":"Figure 10-b"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t19","@type":"Dataset","description":"Post-fit distributions of the SvsB classifier score in the $\\mathrm{SR_{4b}}$ of the ggHH resolved analysis for data (black points) and...","name":"Figure 11-a"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t20","@type":"Dataset","description":"Post-fit distributions of the SvsB classifier score in the $\\mathrm{SR_{4b}}$ of the ggHH resolved analysis for data (black points) and...","name":"Figure 11-b"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t21","@type":"Dataset","description":"Post-fit distributions of the SvsB classifier score in the $\\mathrm{SR_{4b}}$ of the qqHH resolved analysis for data (black points) and...","name":"Figure 12-a"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t22","@type":"Dataset","description":"Post-fit distributions of the SvsB classifier score in the $\\mathrm{SR_{4b}}$ of the qqHH 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validation region $SR_{3MnT}$ for data (black points) and the predicted background (gray...","name":"Figure 15-d"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t27","@type":"Dataset","description":"Postfit distribution of the transformed D(ggHH-vs-bkg) score in the ggHH $SR_{3T1M}$ category for data (black points) and predicted background (gray...","name":"Figure 16-a"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t28","@type":"Dataset","description":"Postfit distribution of the transformed D(ggHH-vs-bkg) score in the ggHH $SR_{3T1L}$ category for data (black points) and predicted background (gray...","name":"Figure 16-b"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t29","@type":"Dataset","description":"Postfit distribution of the transformed D(qqHH-vs-bkg) score in the qqHH $SR_{3T1M}$ category for data (black points) and predicted background (gray...","name":"Figure 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predicted background (gray...","name":"Figure 17-d"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t34","@type":"Dataset","description":"Signal+background fit. Region: SR. Selection: passPreSel. Variable: SvB_MA.ps_hh. Luminosity: 138 $fb^{-1}$","name":"Figure 18"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t35","@type":"Dataset","description":"Pre-fit and post-fit distributions of the fitted observables for the ggHH-inclusive HPSR categories of the merged analysis following the mass...","name":"Figure 20-a"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t36","@type":"Dataset","description":"Pre-fit and post-fit distributions of the fitted observables for the ggHH-inclusive LPSR categories of the merged analysis following the mass...","name":"Figure 20-b"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t37","@type":"Dataset","description":"Pre-fit and post-fit distributions of the fitted observables for the ggHH-inclusive VR categories of the merged analysis following the mass...","name":"Figure 20-c"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t38","@type":"Dataset","description":"Pre-fit and post-fit distributions of the fitted observables for the ggHH-inclusive HPSR categories of the merged analysis following the DNN...","name":"Figure 21-a"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t39","@type":"Dataset","description":"Pre-fit and post-fit distributions of the fitted observables for the ggHH-inclusive LPSR categories of the merged analysis following the DNN...","name":"Figure 21-b"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t40","@type":"Dataset","description":"Pre-fit and post-fit distributions of the fitted observables for the ggHH-inclusive VR categories of the merged analysis following the DNN...","name":"Figure 21-c"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t41","@type":"Dataset","description":"Pre-fit and post-fit distributions of the fitted observables for the qqHH HPSR categories of the merged analysis. Distributions are shown...","name":"Figure 22-a"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t42","@type":"Dataset","description":"Pre-fit and post-fit distributions of the fitted observables for the qqHH LPSR categories of the merged analysis. Distributions are shown...","name":"Figure 22-b"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t43","@type":"Dataset","description":"The background-only fit distributions of the regressed mass of the subleading H boson candidate $m_\\mathrm{reg}(H_{2})$ in ggHH SR 1.","name":"Figure 24a"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t44","@type":"Dataset","description":"The background-only fit distributions of the regressed mass of the subleading H boson candidate $m_\\mathrm{reg}(H_{2})$ in qqHH SR.","name":"Figure 24b"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t45","@type":"Dataset","description":"The background-only fit distributions of the regressed mass of the subleading H boson candidate $m_\\mathrm{reg}(H_{2})$ in ggHH SR 2.","name":"Figure 24c"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t46","@type":"Dataset","description":"The background-only fit distributions of the regressed mass of the subleading H boson candidate $m_\\mathrm{reg}(H_{2})$ in ggHH SR 3.","name":"Figure 24d"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t47","@type":"Dataset","description":"The observed (solid) and expected (dashed) 95\\% CL upper limits on the signal strength of HH production from the resolved...","name":"Figure 25-a"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t48","@type":"Dataset","description":"The same breakdown of 95\\% CL upper limits on the signal strength of qqHH production. Notations are same as in...","name":"Figure 25-b"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t49","@type":"Dataset","description":"The observed (solid) and expected (dashed) 95\\% CL upper limits on the signal strength of the HH production obtained as...","name":"Figure 26-a"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t50","@type":"Dataset","description":"The observed (solid) and expected (dashed) 95\\% CL upper limits on the signal strength of the qqHH production obtained as...","name":"Figure 26-b"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t51","@type":"Dataset","description":"The observed (solid) and expected (dashed) profile likelihood ratios as function of $\\kappa_{\\lambda}$ for the combined fit of resolved and...","name":"Figure 27-a"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t52","@type":"Dataset","description":"The observed (solid) and expected (dashed) profile likelihood ratios as function of $\\kappa_{2V}$ for the combined fit of resolved and...","name":"Figure 27-b"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t53","@type":"Dataset","description":"The observed and expected 2D exclusion range for the $\\mu_{ggHH}$, $\\mu_{qqHH}$ for the combined fit of resolved and merged HH$\\rightarrow$bbbb...","name":"Figure 28-a (observed 68% CL contour)"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t54","@type":"Dataset","description":"The observed and expected 2D exclusion range for the $\\mu_{ggHH}$, $\\mu_{qqHH}$ for the combined fit of resolved and merged HH$\\rightarrow$bbbb...","name":"Figure 28-a (observed 95% CL contour)"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t55","@type":"Dataset","description":"The observed and expected 2D exclusion range for the $\\mu_{ggHH}$, $\\mu_{qqHH}$ for the combined fit of resolved and merged HH$\\rightarrow$bbbb...","name":"Figure 28-a (expected 68% CL contour)"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t56","@type":"Dataset","description":"The observed and expected 2D exclusion range for the $\\mu_{ggHH}$, $\\mu_{qqHH}$ for the combined fit of resolved and merged HH$\\rightarrow$bbbb...","name":"Figure 28-a (expected 95% CL contour)"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t57","@type":"Dataset","description":"The observed and expected 2D exclusion range for the $\\kappa_{\\lambda}$, $\\kappa_{2V}$ for the combined fit of resolved and merged HH$\\rightarrow$bbbb...","name":"Figure 28-b (observed 68% CL contour)"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t58","@type":"Dataset","description":"The observed and expected 2D exclusion range for the $\\kappa_{\\lambda}$, $\\kappa_{2V}$ for the combined fit of resolved and merged HH$\\rightarrow$bbbb...","name":"Figure 28-b (observed 95% CL contour)"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t59","@type":"Dataset","description":"The observed and expected 2D exclusion range for the $\\kappa_{\\lambda}$, $\\kappa_{2V}$ for the combined fit of resolved and merged HH$\\rightarrow$bbbb...","name":"Figure 28-b (expected 68% CL contour)"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t60","@type":"Dataset","description":"The observed and expected 2D exclusion range for the $\\kappa_{\\lambda}$, $\\kappa_{2V}$ for the combined fit of resolved and merged HH$\\rightarrow$bbbb...","name":"Figure 28-b (expected 95% CL contour)"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t61","@type":"Dataset","description":"The observed (solid) and expected (dashed) 95% CL upper limits on the signal strength of HH production from the combination...","name":"Figure 29-a"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t62","@type":"Dataset","description":"The observed (solid) and expected (dashed) 95% CL upper limits on the signal strength of qqHH production from the combination...","name":"Figure 29-b"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t63","@type":"Dataset","description":"The observed (solid) and expected (dashed) 95% CL upper limits on the signal strength of the HH production ($\\mu_{HH}$) obtained...","name":"Figure 30-a"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t64","@type":"Dataset","description":"The observed (solid) and expected (dashed) 95% CL upper limits on the signal strength of the HH production ($\\mu_{HH}$) obtained...","name":"Figure 30-b"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t65","@type":"Dataset","description":"The observed (solid) and expected (dashed) profile likelihood ratios as function of $\\kappa_{\\lambda}$ for the combined fit of Run 2...","name":"Figure 31-a"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t66","@type":"Dataset","description":"The observed (solid) and expected (dashed) profile likelihood ratios as function of $\\kappa_{2V}$ for the combined fit of Run 2...","name":"Figure 31-b"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t67","@type":"Dataset","description":"The observed and expected 2D exclusion range for $\\mu_{ggHH}$, $\\mu_{qqHH}$ for the combination of Run 2 and Run 3 HH$\\rightarrow$bbbb...","name":"Figure 32-a (observed 68\\% CL contour)"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t68","@type":"Dataset","description":"The observed and expected 2D exclusion range for $\\mu_{ggHH}$, $\\mu_{qqHH}$ for the combination of Run 2 and Run 3 HH$\\rightarrow$bbbb...","name":"Figure 32-a (observed 95\\% CL contour)"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t69","@type":"Dataset","description":"The observed and expected 2D exclusion range for $\\mu_{ggHH}$, $\\mu_{qqHH}$ for the combination of Run 2 and Run 3 HH$\\rightarrow$bbbb...","name":"Figure 32-a (expected 68\\% CL contour)"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t70","@type":"Dataset","description":"The observed and expected 2D exclusion range for $\\mu_{ggHH}$, $\\mu_{qqHH}$ for the combination of Run 2 and Run 3 HH$\\rightarrow$bbbb...","name":"Figure 32-a (expected 95\\% CL contour)"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t71","@type":"Dataset","description":"The observed and expected 2D exclusion range for $\\kappa_{\\lambda}$, $\\kappa_{2V}$ for the combination of Run 2 and Run 3 HH$\\rightarrow$bbbb...","name":"Figure 32-b (observed 68\\% CL contour)"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t72","@type":"Dataset","description":"The observed and expected 2D exclusion range for $\\kappa_{\\lambda}$, $\\kappa_{2V}$ for the combination of Run 2 and Run 3 HH$\\rightarrow$bbbb...","name":"Figure 32-b (observed 95\\% CL contour)"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t73","@type":"Dataset","description":"The observed and expected 2D exclusion range for $\\kappa_{\\lambda}$, $\\kappa_{2V}$ for the combination of Run 2 and Run 3 HH$\\rightarrow$bbbb...","name":"Figure 32-b (expected 68\\% CL contour)"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t74","@type":"Dataset","description":"The observed and expected 2D exclusion range for $\\kappa_{\\lambda}$, $\\kappa_{2V}$ for the combination of Run 2 and Run 3 HH$\\rightarrow$bbbb...","name":"Figure 32-b (expected 95\\% CL contour)"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t75","@type":"Dataset","description":"The observed and expected upper limits at 95% CL on the $\\mu_{ZZ}$ and $\\mu_{ZH}$, observed signal strength and significance for...","name":"Table 1"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t76","@type":"Dataset","description":"Expected best fit values and 95% CL upper limits (U.L.) for $\\mu_{HH}$, $\\mu_{ggHH}$ and $\\mu_{qqHH}$ in the HH$\\rightarrow$4b resolved analysis...","name":"Table 2"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t77","@type":"Dataset","description":"Observed best fit values and 95% CL upper limits (U.L.) for $\\mu_{HH}$, $\\mu_{ggHH}$ and $\\mu_{qqHH}$ in the HH$\\rightarrow$4b resolved analysis...","name":"Table 3"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t78","@type":"Dataset","description":"Observed and expected, in absence of signal, intervals for $\\kappa_\\lambda$ and $\\kappa_{2V}$ outside of which the theoretical prediction for the...","name":"Table 4"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t79","@type":"Dataset","description":"Expected and observed $\\mu_{ggHH}$ and their corresponding upper limits (U.L.) at 95% CL in the HH$\\rightarrow$4b resolved channel with Run...","name":"Table 5"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t80","@type":"Dataset","description":"The expected best fit signal strengths and 95% CL upper limits (U.L.) on the inclusive, $\\mu_{ggHH}$, and $\\mu_{qqHH}$ signal strengths...","name":"Table 6"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t81","@type":"Dataset","description":"The observed best fit signal strengths and 95% CL upper limits (U.L.) on the inclusive, $\\mu_{ggHH}$, and $\\mu_{qqHH}$ signal 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the HH$\\rightarrow$bbbb...","name":"Table 11"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t86","@type":"Dataset","description":"Generator-level normalized differential distributions for non-resonant Higgs boson pair production in the $\\mathrm{HH}\\to 4b$ channel as a function of pT(HH)...","name":"Supplementary Gen-level $p^{\\mathrm{HH}}_\\mathrm{T}$"},{"@id":"https://doi.org/10.17182/hepdata.171917.v1/t87","@type":"Dataset","description":"Generator-level normalized differential distributions for non-resonant Higgs boson pair production in the $\\mathrm{HH}\\to 4b$ channel as a function of m(HH)...","name":"Supplementary Gen-level $m_{\\mathrm{HH}}$"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins3150543?version=1"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/171917"}],"inLanguage":"en","name":"Improved results on Higgs boson pair production in the 4b final 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