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Combination of searches for Higgs boson pairs in $pp$ collisions at $\sqrt{s} =$13 TeV with the ATLAS detector

The collaboration
Phys.Lett.B 800 (2020) 135103, 2020.

Abstract (data abstract)
This letter presents a combination of searches for Higgs boson pair production using up to 36.1 fb-1 of proton-proton collision data at a centre-of-mass energy $\sqrt{s}$ = 13 TeV recorded with the ATLAS detector at the LHC. The combination is performed using six analyses searching for Higgs boson pairs decaying into the bbbb, bbWW, bb$\tau\tau$, WWWW, bb$\gamma\gamma$ and WW$\gamma\gamma$ final states. Results are presented for non-resonant and resonant Higgs boson pair production modes. The combined observed limit at 95% confidence level on the non-resonant Higgs boson pair production cross-section is 6.9 times the predicted Standard Model cross-section. Limits are also set on the ratio ($\kappa_{\lambda}$) of the Higgs boson self-coupling to its Standard Model value. This ratio is constrained at 95% confidence level to -5.0$<\kappa_{\lambda}<$12.0. In addition, limits are set on the production of narrow scalar resonances and spin-2 Kaluza-Klein Randall-Sundrum gravitons. Exclusion regions are also provided in the parameter space of the habemus Minimal Supersymmetric Standard Model and the Electroweak Singlet Model.

• #### Signal acceptance times efficiency

Data from Figs. 4 (a)

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Signal acceptance times efficiency as a function of κλ for the $b\bar{b}b\bar{b}$, $b\bar{b}\tau^{+}\tau^{-}$ and $b\bar{b}\gamma\gamma$ analyses. The $b\bar{b}b\bar{b}$ curve is...

• #### Cross-section upper limits at fixed &kappa;<sub>&lambda;</sub>

Data from Figs. 4 (b)

10.17182/hepdata.90521.v1/t2

Upper limits at 95% CL on the cross-section of the ggF non-resonant SM HH production as a function of κλ....

• #### Spin-0 cross-section upper limits of bbbb

Data from Figs. 5 (a)

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Upper limits at 95% CL on the cross-section of the resonant Higgs boson pair production for a spin-0 heavy scalar

• #### Spin-0 cross-section upper limits of bbtautau

Data from Figs. 5 (a)

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Upper limits at 95% CL on the cross-section of the resonant Higgs boson pair production for a spin-0 heavy scalar

• #### Spin-0 cross-section upper limits of bbWW

Data from Figs. 5 (a)

10.17182/hepdata.90521.v1/t5

Upper limits at 95% CL on the cross-section of the resonant Higgs boson pair production for a spin-0 heavy scalar

• #### Spin-0 cross-section upper limits of bbgammagamma

Data from Figs. 5 (a)

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Upper limits at 95% CL on the cross-section of the resonant Higgs boson pair production for a spin-0 heavy scalar

• #### Spin-0 cross-section upper limits of WWWW

Data from Figs. 5 (a)

10.17182/hepdata.90521.v1/t7

Upper limits at 95% CL on the cross-section of the resonant Higgs boson pair production for a spin-0 heavy scalar

• #### Spin-0 cross-section upper limits of WWgammagamma

Data from Figs. 5 (a)

10.17182/hepdata.90521.v1/t8

Upper limits at 95% CL on the cross-section of the resonant Higgs boson pair production for a spin-0 heavy scalar

• #### Spin-0 cross-section upper limits of combination in low mass

Data from Figs. 5 (a)

10.17182/hepdata.90521.v1/t9

Upper limits at 95% CL on the cross-section of the resonant Higgs boson pair production for a spin-0 heavy scalar

• #### Spin-0 cross-section upper limits of combination in mid mass

Data from Figs. 5 (a)

10.17182/hepdata.90521.v1/t10

Upper limits at 95% CL on the cross-section of the resonant Higgs boson pair production for a spin-0 heavy scalar

• #### Spin-0 cross-section upper limits of combination in high mass

Data from Figs. 5 (a)

10.17182/hepdata.90521.v1/t11

Upper limits at 95% CL on the cross-section of the resonant Higgs boson pair production for a spin-0 heavy scalar

• #### Spin-2 c1 cross-section upper limits of bbbb

Data from Figs. 5 (b)

10.17182/hepdata.90521.v1/t12

Upper limits at 95% CL on the cross-section of the resonant Higgs boson pair production for a spin-2 KK graviton...

• #### Spin-2 c1 cross-section upper limits of bbtautau

Data from Figs. 5 (b)

10.17182/hepdata.90521.v1/t13

Upper limits at 95% CL on the cross-section of the resonant Higgs boson pair production for a spin-2 KK graviton...

• #### Spin-2 c1 cross-section upper limits of bbWW

Data from Figs. 5 (b)

10.17182/hepdata.90521.v1/t14

Upper limits at 95% CL on the cross-section of the resonant Higgs boson pair production for a spin-2 KK graviton...

• #### Spin-2 c1 cross-section upper limits of combination in low mass

Data from Figs. 5 (b)

10.17182/hepdata.90521.v1/t15

Upper limits at 95% CL on the cross-section of the resonant Higgs boson pair production for a spin-2 KK graviton...

• #### Spin-2 c1 cross-section upper limits of combination in mid mass

Data from Figs. 5 (b)

10.17182/hepdata.90521.v1/t16

Upper limits at 95% CL on the cross-section of the resonant Higgs boson pair production for a spin-2 KK graviton...

• #### Spin-2 c1 cross-section upper limits of combination in high mass

Data from Figs. 5 (b)

10.17182/hepdata.90521.v1/t17

Upper limits at 95% CL on the cross-section of the resonant Higgs boson pair production for a spin-2 KK graviton...

• #### Spin-2 c2 cross-section upper limits of bbbb

Data from Figs. 5 (c)

10.17182/hepdata.90521.v1/t18

Upper limits at 95% CL on the cross-section of the resonant Higgs boson pair production for a spin-2 KK graviton...

• #### Spin-2 c2 cross-section upper limits of bbtautau

Data from Figs. 5 (c)

10.17182/hepdata.90521.v1/t19

Upper limits at 95% CL on the cross-section of the resonant Higgs boson pair production for a spin-2 KK graviton...

• #### Spin-2 c2 cross-section upper limits of bbWW

Data from Figs. 5 (c)

10.17182/hepdata.90521.v1/t20

Upper limits at 95% CL on the cross-section of the resonant Higgs boson pair production for a spin-2 KK graviton...

• #### Spin-2 c2 cross-section upper limits of combination in low mass

Data from Figs. 5 (c)

10.17182/hepdata.90521.v1/t21

Upper limits at 95% CL on the cross-section of the resonant Higgs boson pair production for a spin-2 KK graviton...

• #### Spin-2 c2 cross-section upper limits of combination in mid mass

Data from Figs. 5 (c)

10.17182/hepdata.90521.v1/t22

Upper limits at 95% CL on the cross-section of the resonant Higgs boson pair production for a spin-2 KK graviton...

• #### Spin-2 c2 cross-section upper limits of combination in high mass

Data from Figs. 5 (c)

10.17182/hepdata.90521.v1/t23

Upper limits at 95% CL on the cross-section of the resonant Higgs boson pair production for a spin-2 KK graviton...

• #### Expected EWK-singlet exclusion with tan&beta;=1

Data from Figs. 6 (a)

10.17182/hepdata.90521.v1/t24

Expected exclusion regions for the EWK-singlet model for tan β = 1. The theoretical contour points with width over mass...

• #### Observed EWK-singlet exclusion with tan&beta;=1

Data from Figs. 6 (a)

10.17182/hepdata.90521.v1/t25

Observed exclusion regions for the EWK-singlet model for tan β = 1. The theoretical contour points with width over mass...

• #### Expected EWK-singlet exclusion with tan&beta;=2

Data from Figs. 6 (b)

10.17182/hepdata.90521.v1/t26

Expected exclusion regions for the EWK-singlet model for tan β = 2. The theoretical contour points with width over mass...

• #### Observed EWK-singlet exclusion with tan&beta;=2

Data from Figs. 6 (b)

10.17182/hepdata.90521.v1/t27

Observed exclusion regions for the EWK-singlet model for tan β = 2. The theoretical contour points with width over mass...

• #### Expected EWK-singlet exclusion with mS=260GeV

Data from Figs. 7 (a)

10.17182/hepdata.90521.v1/t28

Expected exclusion regions in the EWK-singlet model for mS= 260 GeV. The theoretical contour points with width over mass of...

• #### Observed EWK-singlet exclusion with mS=260GeV

Data from Figs. 7 (a)

10.17182/hepdata.90521.v1/t29

Observed exclusion regions in the EWK-singlet model for mS= 260 GeV. The theoretical contour points with width over mass of...

• #### Expected hMSSM exclusion

Data from Figs. 7 (b)

10.17182/hepdata.90521.v1/t30

Expected exclusion regions in the hMSSM model

• #### Expected hMSSM exclusion (-1 sigma band)

Data from Figs. 7 (b)

10.17182/hepdata.90521.v1/t31

Expected exclusion regions (-1 sigma band) in the hMSSM model

• #### Expected hMSSM exclusion (+1 sigma band)

Data from Figs. 7 (b)

10.17182/hepdata.90521.v1/t32

Expected exclusion regions (+1 sigma band) in the hMSSM model

• #### Observed hMSSM exclusion

Data from Figs. 7 (b)

10.17182/hepdata.90521.v1/t33

Observed exclusion regions in the hMSSM model

• #### Cross-section limits at fixed &kappa;<sub>&lambda;</sub> (stat)

Data from Figs. 4 in auxiliary materials on https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HDBS-2018-58/

10.17182/hepdata.90521.v1/t34

Upper limits at 95% CL on the signal cross-section of the ggF non-resonant Higgs boson pair production as a function...

• #### Expected EWK-singlet exclusion with tan&beta;=5

Data from Figs. 5 (a) in auxiliary materials on https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HDBS-2018-58/

10.17182/hepdata.90521.v1/t35

Expected exclusion regions for the EWK-singlet model with tan β = 5.0. The theoretical contour points with width over mass...

• #### Observed EWK-singlet exclusion with tan&beta;=5

Data from Figs. 5 (a) in auxiliary materials on https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HDBS-2018-58/

10.17182/hepdata.90521.v1/t36

Observed exclusion regions for the EWK-singlet model with tan β = 5.0. The theoretical contour points with width over mass...

• #### Expected EWK-singlet exclusion with mS=300GeV

Data from Figs. 5 (b) in auxiliary materials on https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HDBS-2018-58/

10.17182/hepdata.90521.v1/t37

Expected exclusion regions for the EWK-singlet model with mS = 300 GeV. The theoretical contour points with width over mass...

• #### Observed EWK-singlet exclusion with mS=300GeV

Data from Figs. 5 (b) in auxiliary materials on https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HDBS-2018-58/

10.17182/hepdata.90521.v1/t38

Observed exclusion regions for the EWK-singlet model with mS = 300 GeV. The theoretical contour points with width over mass...

• #### Expected EWK-singlet exclusion with mS=400GeV

Data from Figs. 5 (c) in auxiliary materials on https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HDBS-2018-58/

10.17182/hepdata.90521.v1/t39

Expected exclusion regions for the EWK-singlet model with mS = 400 GeV. The theoretical contour points with width over mass...

• #### Observed EWK-singlet exclusion with mS=400GeV

Data from Figs. 5 (c) in auxiliary materials on https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HDBS-2018-58/

10.17182/hepdata.90521.v1/t40

Observed exclusion regions for the EWK-singlet model with mS = 400 GeV. The theoretical contour points with width over mass...

• #### Expected EWK-singlet exclusion with mS=500GeV

Data from Figs. 5 (d) in auxiliary materials on https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HDBS-2018-58/

10.17182/hepdata.90521.v1/t41

Expected exclusion regions for the EWK-singlet model with mS = 500 GeV. The theoretical contour points with width over mass...

• #### Observed EWK-singlet exclusion with mS=500GeV

Data from Figs. 5 (d) in auxiliary materials on https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HDBS-2018-58/

10.17182/hepdata.90521.v1/t42

Observed exclusion regions for the EWK-singlet model with mS = 500 GeV. The theoretical contour points with width over mass...