Search for Higgs boson pairs decaying to WW*WW*, WW*$\tau\tau$, and $\tau\tau\tau\tau$ in proton-proton collisions at $\sqrt{s}$ = 13 TeV

The CMS collaboration
JHEP 07 (2023) 095, 2023.

Abstract (data abstract)
The results of a search for Higgs boson pair ($\textrm{HH}$) production in the $\textrm{WW}^{*}\textrm{WW}^{*}$, $\textrm{WW}^{*}\tau\tau$, and $\tau\tau\tau\tau$ decay modes are presented. The search uses $138~\text{fb}^{-1}$ of proton-proton collision data recorded by the CMS experiment at the LHC at a center-of-mass energy of $13~\mathrm{TeV}$ from 2016 to 2018. Analyzed events contain two, three, or four reconstructed leptons, including electrons, muons, and hadronically decaying tau leptons. No evidence for a signal is found in the data. Upper limits are set on the cross section for nonresonant $\textrm{HH}$ production, as well as resonant production in which a new heavy particle decays to a pair of Higgs bosons. For nonresonant production, the observed (expected) upper limit on the cross section at $95\%$ confidence level (CL) is $21.3$ ($19.4$) times the standard model (SM) prediction. The observed (expected) ratio of the trilinear Higgs boson self-coupling to its value in the SM is constrained to be within the interval $-6.9$ to $11.1$ ($-6.9$ to $11.7$) at $95\%$ CL, and limits are set on a variety of new-physics models using an effective field theory approach. The observed (expected) limits on the cross section for resonant $\textrm{HH}$ production range from $0.18$ to $0.90$ ($0.08$ to $1.06$)$~\mathrm{pb}$ at $95\%$ CL for new heavy-particle masses in the range $250$--$1000~\mathrm{GeV}$.

  • Figure 4-a

    Data from Figure 4 (top left) on page 17

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    Distribution of an input to the BDT classifier in the $2\ell$(ss) category: The scalar $p_{T}$ sum, denoted as $H_{T}$, of...

  • Figure 4-b

    Data from Figure 4 (top right) on page 17

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    Distribution of an input to the BDT classifier in the $2\ell$(ss) category: The angular separation $\Delta R$ between the two...

  • Figure 4-c

    Data from Figure 4 (bottom left) on page 17

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    Distribution of an input to the BDT classifier in the $3\ell$ category: The angular separation between $\ell_{3}$ and the nearest...

  • Figure 4-d

    Data from Figure 4 (bottom right) on page 17

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    Distribution of an input to the BDT classifier in the $3\ell$ category: The linear discrimminant $p_{T}^{miss,LD}$. The discriminant is defined...

  • Figure 5-a

    Data from Figure 5 (left) on page 19

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    Distributions of the transverse mass $m_{T}$ of the lepton that is not originating from the Z boson decay and the...

  • Figure 5-b

    Data from Figure 5 (right) on page 19

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    Distributions of the four lepton invariant mass $m_{4\ell}$ in the $4\ell$/ZZ control region. The distributions expected for the ZZ as...

  • Figure 6-a

    Data from Figure 6 (left) on page 20

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    Distributions of the transverse mass $m_{T}$ of the leading lepton and the missing transverse momentum in the $2\ell$(ss) control region....

  • Figure 6-b

    Data from Figure 6 (right) on page 20

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    Distributions of the reconstructed HH mass $m_{HH}$ in the $2\ell+2 au_{h}$ control region. The distributions expected for the misidentified $\ell/...

  • Figure 7-a

    Data from Figure 7 (top left) on page 26

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    Distribution in the output of the BDT trained for nonresonant HH production and evaluated for the benchmark scenario JHEP04 BM7...

  • Figure 7-b

    Data from Figure 7 (top right) on page 26

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    Distribution in the output of the BDT trained for nonresonant HH production and evaluated for the benchmark scenario JHEP04 BM7...

  • Figure 7-c

    Data from Figure 7 (bottom center) on page 26

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    Distribution in the output of the BDT trained for nonresonant HH production and evaluated for the benchmark scenario JHEP04 BM7...

  • Figure 8-a

    Data from Figure 8 (top left) on page 28

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    Distribution in the output of the BDT trained for nonresonant HH production and evaluated for the benchmark scenario JHEP04 BM7...

  • Figure 8-b

    Data from Figure 8 (top right) on page 28

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    Distribution in the output of the BDT trained for nonresonant HH production and evaluated for the benchmark scenario JHEP04 BM7...

  • Figure 8-c

    Data from Figure 8 (bottom left) on page 28

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    Distribution in the output of the BDT trained for nonresonant HH production and evaluated for the benchmark scenario JHEP04 BM7...

  • Figure 8-d

    Data from Figure 8 (bottom right) on page 28

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    Distribution in the output of the BDT trained for nonresonant HH production and evaluated for the benchmark scenario JHEP04 BM7...

  • Figure 9

    Data from Figure 9 on page 29

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    Observed and expected $95\%$ CL upper limits on the SM HH production cross section, obtained for both individual search categories...

  • Figure 10-a

    Data from Figure 10 (left) on page 29

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    Observed and expected $95\%$ CL upper limits on the HH production cross section as a function of the Higgs boson...

  • Figure 10-b

    Data from Figure 10 (right) on page 29

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    Observed and expected $95\%$ CL upper limits on the HH production cross section as a function of the Higgs boson...

  • Figure 11-a

    Data from Figure 11 (top) on page 30

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    Observed and expected $95\%$ CL upper limits on the HH production cross section for the twelve benchmark scenarios from doi:10.1007/JHEP04(2016)126,...

  • Figure 11-b

    Data from Figure 11 (bottom) page 30

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    Observed and expected $95\%$ CL upper limits on the HH production cross section for the twelve benchmark scenarios from doi:10.1007/JHEP04(2016)126,...

  • Figure 12-a

    Data from Figure 12 (left) on page 32

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    Observed and expected $95\%$ CL upper limits on the HH production cross section as a function of the effective coupling...

  • Figure 12-b

    Data from Figure 12 (right) on page 32

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    Observed and expected $95\%$ CL upper limits on the HH production cross section as a function of the effective coupling...

  • Figure 13-a

    Data from Figure 13 (left) on page 32

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    Observed and expected $95\%$ CL upper limits on the HH production cross section as a function of the Higgs boson...

  • Figure 13-b

    Data from Figure 13 (right) on page 32

    10.17182/hepdata.130795.v2/t24

    Observed and expected $95\%$ CL upper limits on the HH production cross section as a function of the effective coupling...

  • Figure 14-a

    Data from Figure 14 (top left) on page 33

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    Observed and expected $95\%$ CL upper limits on the production of new particles X of spin $0$ and mass $m_{X}$...

  • Figure 14-b

    Data from Figure 14 (top right) on page 33

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    Observed and expected $95\%$ CL upper limits on the production of new particles X of spin $0$ and mass $m_{X}$...

  • Figure 14-c

    Data from Figure 14 (bottom left) on page 33

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    Observed and expected $95\%$ CL upper limits on the production of new particles X of spin $2$ and mass $m_{X}$...

  • Figure 14-d

    Data from Figure 14 (bottom right) on page 33

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    Observed and expected $95\%$ CL upper limits on the production of new particles X of spin $2$ and mass $m_{X}$...

  • Figure 15-a

    Data from Figure 15 (left) on page 34

    10.17182/hepdata.130795.v2/t29

    Distribution in the output of the BDT trained for resonances of spin 2 and mass $750\,$GeV production for the $2\ell$(ss)...

  • Figure 15-b

    Data from Figure 15 (right) on page 34

    10.17182/hepdata.130795.v2/t30

    Distribution in the output of the BDT trained for resonances of spin 2 and mass $750\,$GeV production for the $3\ell$...

Version 2 modifications: A few tables of the original publication that have been added between journal submission and publication have been added.

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