Abstract (data abstract)

Constraints on the Higgs boson self-coupling are set by combining double-Higgs boson analyses in the bbbb, bb$\tau\tau$ and bb$\gamma\gamma$ decay channels with single-Higgs boson analyses targeting the $\gamma\gamma$, $ZZ^{∗}$, $WW^{∗}$, $\tau\tau$ and bb decay channels. The data used in these analyses were recorded by the ATLAS detector at the LHC in proton−proton collisions at 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 $-0.4< \kappa_\lambda < 6.3$ 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.

Table 1

Data from Figure 3

10.17182/hepdata.135471.v1/t1

Observed and expected 95% CL upper limits on the signal strength for double-Higgs production from the bbbb, bb$\tau\tau$ and bb$\gamma\gamma$...
Table 2

Data from Figure 4a

10.17182/hepdata.135471.v1/t2

Observed and expected 95% CL exclusion limits on the production cross-sections of the combined ggF HH and VBF HH processes...
Table 3

Data from Figure 4b

10.17182/hepdata.135471.v1/t3

Observed and expected 95% CL exclusion limits on the production cross-sections of the VBF HH process as a function of...
Table 4 (HHH obs)

Data from Figure 5a

10.17182/hepdata.135471.v1/t4

Observed values of the test statistic (-2ln$\Lambda$), as a function of the $\kappa_\lambda$ parameter for the single-Higgs and double-Higgs analyses...
Table 5 (diHiggs obs)

Data from Figure 5a

10.17182/hepdata.135471.v1/t5

Observed values of the test statistic (-2ln$\Lambda$), as a function of the $\kappa_\lambda$ parameter for the double-Higgs analyses, with all...
Table 6 (singleH obs)

Data from Figure 5a

10.17182/hepdata.135471.v1/t6

Observed values of the test statistic (-2ln$\Lambda$), as a function of the $\kappa_\lambda$ parameter for the single-Higgs analyses, with all...
Table 7 (generic obs)

Data from Figure 5a

10.17182/hepdata.135471.v1/t7

Observed values of the test statistic (-2ln$\Lambda$), as a function of the $\kappa_\lambda$ parameter for the single-Higgs and double-Higgs combination...
Table 8 (HHH exp)

Data from Figure 5b

10.17182/hepdata.135471.v1/t8

Expected values of the test statistic (-2ln$\Lambda$), as a function of the $\kappa_\lambda$ parameter for the single-Higgs and double-Higgs analyses...
Table 9 (diHiggs exp)

Data from Figure 5b

10.17182/hepdata.135471.v1/t9

Expected values of the test statistic (-2ln$\Lambda$), as a function of the $\kappa_\lambda$ parameter for the double-Higgs analyses.
Table 10 (singleH exp)

Data from Figure 5b

10.17182/hepdata.135471.v1/t10

Expected values of the test statistic (-2ln$\Lambda$), as a function of the $\kappa_\lambda$ parameter for the single-Higgs analyses, with all...
Table 11 (generic exp)

Data from Figure 5b

10.17182/hepdata.135471.v1/t11

Expected values of the test statistic (-2ln$\Lambda$), as a function of the $\kappa_\lambda$ parameter for the single-Higgs and double-Higgs analyses...
Table 12 (HHH obs 68%)

Data from Figure 6a

10.17182/hepdata.135471.v1/t12

Observed constraints in the $\kappa_\lambda$–$\kappa_t$ plane from single-Higgs and double-Higgs combination. The solid lines show the 68% CL contours. The...
Table 13 (HHH obs 95%)

Data from Figure 6a

10.17182/hepdata.135471.v1/t13

Observed constraints in the $\kappa_\lambda$–$\kappa_t$ plane from single-Higgs and double-Higgs combination. The dashed lines show the 95% CL contours. The...
Table 14 (diHiggs obs 68%)

Data from Figure 6a

10.17182/hepdata.135471.v1/t14

Observed constraints in the $\kappa_\lambda$–$\kappa_t$ plane from double-Higgs analysis. The solid lines show the 68% CL contours. The double-Higgs contours...
Table 15 (diHiggs obs 95%)

Data from Figure 6a

10.17182/hepdata.135471.v1/t15

Observed constraints in the $\kappa_\lambda$–$\kappa_t$ plane from double-Higgs analysis. The dashed lines show the 95% CL contours. The double-Higgs contours...
Table 16 (singleH obs 68%)

Data from Figure 6a

10.17182/hepdata.135471.v1/t16

Observed constraints in the $\kappa_\lambda$–$\kappa_t$ plane from single-Higgs analysis. The solid lines show the 68% CL contours.
Table 17 (singleH obs 95%)

Data from Figure 6a

10.17182/hepdata.135471.v1/t17

Observed constraints in the $\kappa_\lambda$–$\kappa_t$ plane from single-Higgs analysis. The dashed lines show the 95% CL contours.
Table 18 (HHH exp 68%)

Data from Figure 6b

10.17182/hepdata.135471.v1/t18

Expected constraints in the $\kappa_\lambda$–$\kappa_t$ plane from single-Higgs and double-Higgs combination. The solid lines show the 68% CL contours. The...
Table 19 (HHH exp 95%)

Data from Figure 6b

10.17182/hepdata.135471.v1/t19

Expected constraints in the $\kappa_\lambda$–$\kappa_t$ plane from single-Higgs and double-Higgs combination. The dashed lines show the 95% CL contours. The...
Table 20 (diHiggs exp 68%)

Data from Figure 6b

10.17182/hepdata.135471.v1/t20

Expected constraints in the $\kappa_\lambda$–$\kappa_t$ plane from double-Higgs analyses. The solid lines show the 68% CL contours. The double-Higgs contours...
Table 21 (diHiggs exp 95%)

Data from Figure 6b

10.17182/hepdata.135471.v1/t21

Expected constraints in the $\kappa_\lambda$–$\kappa_t$ plane from double-Higgs analyses. The dashed lines show the 95% CL contours. The double-Higgs contours...
Table 22 (singleH exp 68%)

Data from Figure 6b

10.17182/hepdata.135471.v1/t22

Expected constraints in the $\kappa_\lambda$–$\kappa_t$ plane from single-Higgs analyses. The solid lines show the 68% CL contours.
Table 23 (singleH exp 95%)

Data from Figure 6b

10.17182/hepdata.135471.v1/t23

Expected constraints in the $\kappa_\lambda$–$\kappa_t$ plane from single-Higgs analyses. The dashed lines show the 95% CL contours.
Table 24

Data from Figure Aux 1

10.17182/hepdata.135471.v1/t24

Observed and expected 95% CL upper limits on the sum of the ggF HH and VBF HH production cross-section from...
Table 25 (bbbb observed)

Data from Figure Aux 3a

10.17182/hepdata.135471.v1/t25

Observed value of the test statistic (-2ln$\Lambda$), as a function of the $\kappa_\lambda$ parameter for the HH to bbbb analysis....
Table 26 (bbtautau observed)

Data from Figure Aux 3a

10.17182/hepdata.135471.v1/t26

Observed value of the test statistic (-2ln$\Lambda$), as a function of the $\kappa_\lambda$ parameter for the HH to bb$\tau\tau$ analysis....
Table 27 (bbyy observed)

Data from Figure Aux 3a

10.17182/hepdata.135471.v1/t27

Observed value of the test statistic (-2ln$\Lambda$), as a function of the $\kappa_\lambda$ parameter for the HH to bb$\gamma\gamma$ analysis....
Table 28 (combined observed)

Data from Figure Aux 3a

10.17182/hepdata.135471.v1/t28

Observed value of the test statistic (-2ln$\Lambda$), as a function of the $\kappa_\lambda$ parameter for the double-Higgs combination. All other...
Table 29 (bbbb expected)

Data from Figure Aux 3b

10.17182/hepdata.135471.v1/t29

Expected value of the test statistic (-2ln$\Lambda$), as a function of the $\kappa_\lambda$ parameter for HH to bbbb analysis. All...
Table 30 (bbtautau expected)

Data from Figure Aux 3b

10.17182/hepdata.135471.v1/t30

Expected value of the test statistic (-2ln$\Lambda$), as a function of the $\kappa_\lambda$ parameter for HH to bb$\tau\tau$ analysis. All...
Table 31 (bbyy expected)

Data from Figure Aux 3b

10.17182/hepdata.135471.v1/t31

Expected value of the test statistic (-2ln$\Lambda$), as a function of the $\kappa_\lambda$ parameter for HH to bb$\gamma\gamma$ analysis. All...
Table 32 (combined expected)

Data from Figure Aux 3b

10.17182/hepdata.135471.v1/t32

Expected value of the test statistic (-2ln$\Lambda$), as a function of the $\kappa_\lambda$ parameter for double-Higgs combination. All other coupling...
Table 33 (bbbb observed)

Data from Figure Aux 4a

10.17182/hepdata.135471.v1/t33

Observed value of the test statistic (-2ln$\Lambda$), as a function of the $\kappa_{2V}$ parameter for the HH to bbbb analysis....
Table 34 (bbtautau observed)

Data from Figure Aux 4a

10.17182/hepdata.135471.v1/t34

Observed value of the test statistic (-2ln$\Lambda$), as a function of the $\kappa_{2V}$ parameter for the HH to bb$\tau\tau$ analysis....
Table 35 (bbyy observed)

Data from Figure Aux 4a

10.17182/hepdata.135471.v1/t35

Observed value of the test statistic (-2ln$\Lambda$), as a function of the $\kappa_{2V}$ parameter for the HH to bb$\gamma\gamma$ analysis....
Table 36 (combined observed)

Data from Figure Aux 4a

10.17182/hepdata.135471.v1/t36

Observed value of the test statistic (-2ln$\Lambda$), as a function of the $\kappa_{2V}$ parameter for the double-Higgs combination. All other...
Table 37 (bbbb expected)

Data from Figure Aux 4b

10.17182/hepdata.135471.v1/t37

Expected value of the test statistic (-2ln$\Lambda$), as a function of the $\kappa_{2V}$ parameter for the HH to bbbb analysis....
Table 38 (bbtautau expected)

Data from Figure Aux 4b

10.17182/hepdata.135471.v1/t38

Expected value of the test statistic (-2ln$\Lambda$), as a function of the $\kappa_{2V}$ parameter for the HH to bb$\tau\tau$ analysis....
Table 39 (bbyy expected)

Data from Figure Aux 4b

10.17182/hepdata.135471.v1/t39

Expected value of the test statistic (-2ln$\Lambda$), as a function of the $\kappa_{2V}$ parameter for the HH to bb$\gamma\gamma$ analysis....
Table 40 (combined expected)

Data from Figure Aux 4b

10.17182/hepdata.135471.v1/t40

Expected value of the test statistic (-2ln$\Lambda$), as a function of the $\kappa_{2V}$ parameter for the double-Higgs combination. All other...
Table 41 (diHiggs obs 68%)

Data from Figure Aux 5a

10.17182/hepdata.135471.v1/t41

Observed constraints in the $\kappa_{2V}$–$\kappa_{V}$ plane from double-Higgs combination. The solid lines show the 68% (95%) CL contours.
Table 42 (diHiggs obs 95%)

Data from Figure Aux 5a

10.17182/hepdata.135471.v1/t42

Observed constraints in the $\kappa_{2V}$–$\kappa_{V}$ plane from double-Higgs combination. The dashed lines show the 68% (95%) CL contours.
Table 43 (diHiggs exp 68%)

Data from Figure Aux 5b

10.17182/hepdata.135471.v1/t43

Expected constraints in the $\kappa_{2V}$-$\kappa_{V}$ plane from double-Higgs combination. The solid lines show the 68% CL contours.
Table 44 (diHiggs exp 95%)

Data from Figure Aux 5b

10.17182/hepdata.135471.v1/t44

Expected constraints in the $\kappa_{2V}$-$\kappa_{V}$ plane from double-Higgs combination. The dashed lines show the 95% CL contours.

Table 1

Table 2

Table 3

Table 4 (HHH obs)

Table 5 (diHiggs obs)

Table 6 (singleH obs)

Table 7 (generic obs)

Table 8 (HHH exp)

Table 9 (diHiggs exp)

Table 10 (singleH exp)

Table 11 (generic exp)

Table 12 (HHH obs 68%)

Table 13 (HHH obs 95%)

Table 14 (diHiggs obs 68%)

Table 15 (diHiggs obs 95%)

Table 16 (singleH obs 68%)

Table 17 (singleH obs 95%)

Table 18 (HHH exp 68%)

Table 19 (HHH exp 95%)

Table 20 (diHiggs exp 68%)

Table 21 (diHiggs exp 95%)

Table 22 (singleH exp 68%)

Table 23 (singleH exp 95%)

Table 24

Table 25 (bbbb observed)

Table 26 (bbtautau observed)

Table 27 (bbyy observed)

Table 28 (combined observed)

Table 29 (bbbb expected)

Table 30 (bbtautau expected)

Table 31 (bbyy expected)

Table 32 (combined expected)

Table 33 (bbbb observed)

Table 34 (bbtautau observed)

Table 35 (bbyy observed)

Table 36 (combined observed)

Table 37 (bbbb expected)

Table 38 (bbtautau expected)

Table 39 (bbyy expected)

Table 40 (combined expected)

Table 41 (diHiggs obs 68%)

Table 42 (diHiggs obs 95%)

Table 43 (diHiggs exp 68%)

Table 44 (diHiggs exp 95%)

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