{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.157024.v1","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/2845789"}},{"@id":"https://doi.org/10.1103/PhysRevD.111.032006","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"ATLAS Collaboration"},"creator":{"@type":"Organization","name":"ATLAS Collaboration"},"datePublished":"2025","description":"A search for the production of three Higgs bosons ($HHH$) in the $b\\bar{b}b\\bar{b}b\\bar{b}$ final state is presented. The search uses 126 $\\text{fb}^{-1}$ of proton-proton collision data at $\\sqrt{s}=13$ TeV collected with the ATLAS detector at the Large Hadron Collider. The analysis targets both non-resonant and resonant production of $HHH$. The resonant interpretations primarily consider a cascade decay topology of $X\\rightarrow SH\\rightarrow HHH$ with masses of the new scalars $X$ and $S$ up to 1.5 TeV and 1 TeV, respectively. In addition to scenarios where $S$ is off-shell, the non-resonant interpretation includes a search for standard model (SM) $HHH$ production, with limits on the tri-linear and quartic Higgs self-coupling set. No evidence for $HHH$ production is observed. An upper limit of 59 fb is set, at 95% confidence level, on the cross-section for Standard-Model $HHH$ production.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.157024.v1/t1","@type":"Dataset","description":"Jet pairing efficiencies over the parameter space for the SM-like $(\\kappa_3,\\kappa_4)$ scan. The pairing efficiency is evaluated in the 6$b$...","name":"Figure 03a - SM pairing efficiencies"},{"@id":"https://doi.org/10.17182/hepdata.157024.v1/t2","@type":"Dataset","description":"Jet pairing efficiencies over the parameter space for the TRSM signals. The pairing efficiency is evaluated in the 6$b$ region...","name":"Figure 03b - TRSM pairing efficiencies"},{"@id":"https://doi.org/10.17182/hepdata.157024.v1/t3","@type":"Dataset","description":"Jet pairing efficiencies over the parameter space for the narrow-width heavy resonance signals. The pairing efficiency is evaluated in the...","name":"Figure 03c - Narrow-width Heavy Resonance pairing efficiencies"},{"@id":"https://doi.org/10.17182/hepdata.157024.v1/t4","@type":"Dataset","description":"Jet pairing efficiencies over the parameter space for the wide-width heavy resonance signals. The pairing efficiency is evaluated in the...","name":"Figure 03d - Wide-width Heavy Resonance pairing efficiencies"},{"@id":"https://doi.org/10.17182/hepdata.157024.v1/t5","@type":"Dataset","description":"Distributions of scores for nonresDNN in 6b data and the background prediction after background-only fits to the observed data. The...","name":"Figure 06a - Post-fit nonresDNN score distribution"},{"@id":"https://doi.org/10.17182/hepdata.157024.v1/t6","@type":"Dataset","description":"Distributions of scores for resDNN in 6b data and the background prediction after background-only fits to the observed data. The...","name":"Figure 06b - Post-fit resDNN score distribution"},{"@id":"https://doi.org/10.17182/hepdata.157024.v1/t7","@type":"Dataset","description":"Distributions of scores for heavyresDNN in 6b data and the background prediction after background-only fits to the observed data. The...","name":"Figure 06c - Post-fit heavyresDNN score distribution"},{"@id":"https://doi.org/10.17182/hepdata.157024.v1/t8","@type":"Dataset","description":"Expected 95% CL $HHH$ cross section upper limits for the phase space within the perturbative unitarity bounds of the TRSM...","name":"Figure 07a - TRSM expected limits"},{"@id":"https://doi.org/10.17182/hepdata.157024.v1/t9","@type":"Dataset","description":"Observed 95% CL $HHH$ cross section upper limits for the phase space within the perturbative unitarity bounds of the TRSM...","name":"Figure 07b - TRSM observed limits"},{"@id":"https://doi.org/10.17182/hepdata.157024.v1/t10","@type":"Dataset","description":"Expected 95% CL $HHH$ cross section upper limits for the narrow-width (1%) heavy resonance signals.","name":"Figure 08a - Narrow-width Heavy Resonance expected upper limits"},{"@id":"https://doi.org/10.17182/hepdata.157024.v1/t11","@type":"Dataset","description":"Expected 95% CL $HHH$ cross section upper limits for the wide-width (20%) heavy resonance signals.","name":"Figure 08b - Wide-width Heavy Resonance expected limits"},{"@id":"https://doi.org/10.17182/hepdata.157024.v1/t12","@type":"Dataset","description":"Observed 95% CL $HHH$ cross section upper limits for the narrow-width (1%) heavy resonance signals.","name":"Figure 08c - Narrow-width Heavy Resonance observed limits"},{"@id":"https://doi.org/10.17182/hepdata.157024.v1/t13","@type":"Dataset","description":"Observed 95% CL $HHH$ cross section upper limits for the wide-width (20%) heavy resonance signals.","name":"Figure 08d - Wide-width Heavy Resonance observed limits"},{"@id":"https://doi.org/10.17182/hepdata.157024.v1/t14","@type":"Dataset","description":"Expected 95% CL constraints on $\\kappa_3$ and $\\kappa_4$, the ratios of the Higgs tri-linear and quartic self-couplings to their predicted...","name":"Figure 09 - 2D-kappa scan expected 95% CL limits"},{"@id":"https://doi.org/10.17182/hepdata.157024.v1/t15","@type":"Dataset","description":"Expected 68% CL constraints on $\\kappa_3$ and $\\kappa_4$, the ratios of the Higgs tri-linear and quartic self-couplings to their predicted...","name":"Figure 09 - 2D-kappa scan expected 68% CL limits"},{"@id":"https://doi.org/10.17182/hepdata.157024.v1/t16","@type":"Dataset","description":"Observed 95% CL constraints on $\\kappa_3$ and $\\kappa_4$, the ratios of the Higgs tri-linear and quartic self-couplings to their predicted...","name":"Figure 09 - 2D-kappa scan observed 95% CL limits"},{"@id":"https://doi.org/10.17182/hepdata.157024.v1/t17","@type":"Dataset","description":"Observed 68% CL constraints on $\\kappa_3$ and $\\kappa_4$, the ratios of the Higgs tri-linear and quartic self-couplings to their predicted...","name":"Figure 09 - 2D-kappa scan observed 68% CL limits"},{"@id":"https://doi.org/10.17182/hepdata.157024.v1/t18","@type":"Dataset","description":"Unitarity limits, calculated in Eur. Phys. J. C 84 (2024) 366, are overlaid in the region bounded by the gray...","name":"Figure 09 - 2D-kappa scan unitarity limits"},{"@id":"https://doi.org/10.17182/hepdata.157024.v1/t19","@type":"Dataset","description":"Overall acceptance x efficiency for events entering the 6$b$ region over the parameter space for the TRSM signals. Generator weights,...","name":"Figure Aux 01a - TRSM Acc x Eff"},{"@id":"https://doi.org/10.17182/hepdata.157024.v1/t20","@type":"Dataset","description":"Overall acceptance x efficiency for events entering the 6$b$ region over the parameter space for the narrow-width heavy resonance signals....","name":"Figure Aux 01b - Narrow-width Heavy Resonance Acc x Eff"},{"@id":"https://doi.org/10.17182/hepdata.157024.v1/t21","@type":"Dataset","description":"Overall acceptance x efficiency for events entering the 6$b$ region over the parameter space for the wide-width heavy resonance signals....","name":"Figure Aux 01c - Wide-width Heavy Resonance Acc x Eff"},{"@id":"https://doi.org/10.17182/hepdata.157024.v1/t22","@type":"Dataset","description":"Expected one-dimensional likelihood scan over the Higgs self-coupling modifier $\\kappa_3$. Both of the modifiers are profiled in the profile-likelihood fit,...","name":"Figure Aux 14a - 1D-kappa scan kappa-3 expected -loglikelihood"},{"@id":"https://doi.org/10.17182/hepdata.157024.v1/t23","@type":"Dataset","description":"Observed one-dimensional likelihood scan over the Higgs self-coupling modifier $\\kappa_3$. Both of the modifiers are profiled in the profile-likelihood fit,...","name":"Figure Aux 14a - 1D-kappa scan kappa-3 observed -loglikelihood"},{"@id":"https://doi.org/10.17182/hepdata.157024.v1/t24","@type":"Dataset","description":"Expected one-dimensional likelihood scan over the Higgs self-coupling modifier $\\kappa_4$. Both of the modifiers are profiled in the profile-likelihood fit,...","name":"Figure Aux 14b - 1D-kappa scan kappa-4 expected -loglikelihood"},{"@id":"https://doi.org/10.17182/hepdata.157024.v1/t25","@type":"Dataset","description":"Observed one-dimensional likelihood scan over the Higgs self-coupling modifier $\\kappa_4$. Both of the modifiers are profiled in the profile-likelihood fit,...","name":"Figure Aux 14b - 1D-kappa scan kappa-4 observed -loglikelihood"},{"@id":"https://doi.org/10.17182/hepdata.157024.v1/t26","@type":"Dataset","description":"Summary of the impact on the analysis of different sources of systematic uncertainty. The impact is estimated as the absolute...","name":"Table 02 - Uncertainty impacts"},{"@id":"https://doi.org/10.17182/hepdata.157024.v1/t27","@type":"Dataset","description":"Cutflow for selected signal points. 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