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Constraints on spin-0 dark matter mediators and invisible Higgs decays using ATLAS 13 TeV $pp$ collision data with two top quarks and missing transverse momentum in the final state

The ATLAS collaboration
Aad, Georges , Abbott, Braden Keim , Abbott, D.C. , Abeling, Kira , Abidi, Haider , Aboulhorma, Asmaa , Abramowicz, Halina , Abreu, Henso , Abulaiti, Yiming , Abusleme Hoffman, A.C.
Eur.Phys.J.C 83 (2023) 503, 2023.
https://doi.org/10.17182/hepdata.129623

Abstract (data abstract)
This paper presents a statistical combination of searches targeting final states with two top quarks and invisible particles, characterised by the presenceof zero, one or two leptons, at least one jet originating from a $b$-quark and missing transverse momentum.The analyses are searches for phenomena beyond the Standard Model consistent with the direct production of dark matter in $pp$ collisions at the LHC, using 139 fb$^{-\text{1}}$ of data collected with the ATLAS detector at a centre-of-mass energy of 13 TeV.The results are interpreted in terms of simplified dark matter models with a spin-0 scalar or pseudoscalar mediator particle. In addition,the results are interpreted in terms of upper limits on the Higgs boson invisible branching ratio, where the Higgs boson is producedaccording to the Standard Model in association with a pair of top quarks.For scalar (pseudoscalar) dark matter models, with all couplings set to unity, the statistical combination extends the mass range excluded by the best of the individual channels by 100 (30) GeV, excluding mediator masses up to 370 GeV.In addition, the statistical combination improves the expected coupling exclusion reach by 14\% (24\%), assuming a scalar (pseudoscalar) mediator mass of 10 GeV.An upper limit on the Higgs boson invisible branching ratio of 0.38 ($\text{0.30}^{+\text{0.13}}_{-\text{0.09}}$) is observed (expected) at 95\% confidence level.

  • Figure 2a

    Data from Figure 2a

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    Post-fit signal region yields for the tt0L-high and the tt0L-low analyses. The bottom panel shows the statistical significance of the...

  • Figure 2b

    Data from Figure 2b

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    Representative fit distribution in the signal region for the tt1L analysis: each bin of such distribution corresponds to a single...

  • Figure 2c

    Data from Figure 2c

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    Representative fit distribution in the same flavour leptons signal region for the tt2L analysis: each bin of such distribution, starting...

  • Figure 4

    Data from Figure 4

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    Summary of the total uncertainty in the background prediction for each SR of the tt0L-low, tt0L-high, tt1L and tt2L analysis...

  • Figure 5a

    Data from Figure 5a

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    Exclusion limits for colour-neutral scalar mediator dark matter models as a function of the mediator mass $m(\phi)$ for a DM...

  • Figure 5b

    Data from Figure 5b

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    Exclusion limits for colour-neutral pseudoscalar mediator dark matter models as a function of the mediator mass $m(a)$ for a DM...

  • Figure 9a

    Data from Figure 9a

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    $E_{\text{T}}^{\text{miss}}$ distribution in SR0X for the tt0L-low analysis. The contributions from all SM backgrounds are shown after the profile likelihood...

  • Figure 9b

    Data from Figure 9b

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    $E_{\text{T}}^{\text{miss}}$ distribution in SRWX for the tt0L-low analysis. The contributions from all SM backgrounds are shown after the profile likelihood...

  • Figure 9c

    Data from Figure 9c

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    $E_{\text{T}}^{\text{miss}}$ distribution in SRTX for the tt0L-low analysis. The contributions from all SM backgrounds are shown after the profile likelihood...

  • Figure 10a

    Data from Figure 10a

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    Exclusion limits for colour-neutral scalar mediator dark matter models as a function of the mediator mass $m(\phi)$ for a DM...

  • Figure 10b

    Data from Figure 10b

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    Exclusion limits for colour-neutral pseudoscalar mediator dark matter models as a function of the mediator mass $m(a)$ for a DM...

  • Auxiliary Figure 1a

    Data from Auxiliary Figure 1a

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    Exclusion limits for colour-neutral scalar mediator dark matter models as a function of the mediator mass $m(\phi)$ for a DM...

  • Auxiliary Figure 1b

    Data from Auxiliary Figure 1b

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    Exclusion limits for colour-neutral pseudoscalar mediator dark matter models as a function of the mediator mass $m(a)$ for a DM...

  • Auxiliary Figure 2a

    Data from Auxiliary Figure 2a

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    Exclusion limits for colour-neutral scalar mediator dark matter models as a function of the mediator mass $m(\phi)$ for a DM...

  • Auxiliary Figure 2b

    Data from Auxiliary Figure 2b

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    Exclusion limits for colour-neutral pseudoscalar mediator dark matter models as a function of the mediator mass $m(a)$ for a DM...

  • Auxiliary Figure 3

    Data from Auxiliary Figure 3

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    Representative fit distribution in the different flavour leptons signal region for the tt2L analysis: each bin of such distribution, starting...

  • Auxiliary Table 5

    Data from Auxiliary Table 5

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    Signal acceptance in SR0X, SRWX and SRTX for simplified DM+$t\bar{t}$ model, defined as the number of accepted events at generator...

  • Auxiliary Table 6

    Data from Auxiliary Table 6

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    Signal acceptance in SR0X, SRWX and SRTX for simplified DM+$tW$ model, defined as the number of accepted events at generator...

  • Auxiliary Table 7

    Data from Auxiliary Table 7

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    Signal acceptance in SR0X, SRWX and SRTX for simplified DM+$tj$ model, defined as the number of accepted events at generator...

  • Auxiliary Table 8

    Data from Auxiliary Table 8

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    Signal efficiency in SR0X, SRWX and SRTX for simplified DM+$t\bar{t}$ model, defined as the number of selected reconstructed events divided...

  • Auxiliary Table 9

    Data from Auxiliary Table 9

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    Signal efficiency in SR0X, SRWX and SRTX for simplified DM+$tW$ model, defined as the number of selected reconstructed events divided...

  • Auxiliary Table 10

    Data from Auxiliary Table 10

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    Signal efficiency in SR0X, SRWX and SRTX for simplified DM+$tj$ model, defined as the number of selected reconstructed events divided...

  • Auxiliary Table 11

    Data from Auxiliary Table 11

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    Cutflow for the reference point DM+$t\bar{t}$ $m(\phi, \chi) = (10, 1)$ GeV in signal region SR0X. The column labelled 'weighted'...

  • Auxiliary Table 12

    Data from Auxiliary Table 12

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    Cutflow for the reference point DM+$t\bar{t}$ $m(\phi, \chi) = (10, 1)$ GeV in signal region SRWX. The column labelled 'weighted'...

  • Auxiliary Table 13

    Data from Auxiliary Table 13

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    Cutflow for the reference point DM+$t\bar{t}$ $m(\phi, \chi) = (10, 1)$ GeV in signal region SRTX. The column labelled 'weighted'...

  • Auxiliary Table 14

    Data from Auxiliary Table 14

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    Cutflow for the reference point DM+$t\bar{t}$ $m(a, \chi) = (10, 1)$ GeV in signal region SR0X. The column labelled 'weighted'...

  • Auxiliary Table 15

    Data from Auxiliary Table 15

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    Cutflow for the reference point DM+$t\bar{t}$ $m(a, \chi) = (10, 1)$ GeV in signal region SRWX. The column labelled 'weighted'...

  • Auxiliary Table 16

    Data from Auxiliary Table 16

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    Cutflow for the reference point DM+$t\bar{t}$ $m(a, \chi) = (10, 1)$ GeV in signal region SRTX. The column labelled 'weighted'...

  • Auxiliary Table 17

    Data from Auxiliary Table 17

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    Cutflow for the reference point DM+$tW$ $m(\phi, \chi) = (10, 1)$ GeV in signal region SR0X. The column labelled 'weighted'...

  • Auxiliary Table 18

    Data from Auxiliary Table 18

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    Cutflow for the reference point DM+$tW$ $m(\phi, \chi) = (10, 1)$ GeV in signal region SRWX. The column labelled 'weighted'...

  • Auxiliary Table 19

    Data from Auxiliary Table 19

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    Cutflow for the reference point DM+$tW$ $m(\phi, \chi) = (10, 1)$ GeV in signal region SRTX. The column labelled 'weighted'...

  • Auxiliary Table 20

    Data from Auxiliary Table 20

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    Cutflow for the reference point DM+$tW$ $m(a, \chi) = (10, 1)$ GeV in signal region SR0X. The column labelled 'weighted'...

  • Auxiliary Table 21

    Data from Auxiliary Table 21

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    Cutflow for the reference point DM+$tW$ $m(a, \chi) = (10, 1)$ GeV in signal region SRWX. The column labelled 'weighted'...

  • Auxiliary Table 22

    Data from Auxiliary Table 22

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    Cutflow for the reference point DM+$tW$ $m(a, \chi) = (10, 1)$ GeV in signal region SRTX. The column labelled 'weighted'...

  • Auxiliary Table 23

    Data from Auxiliary Table 23

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    Cutflow for the reference point DM+$tj$ $m(\phi, \chi) = (10, 1)$ GeV in signal region SR0X. The column labelled 'weighted'...

  • Auxiliary Table 24

    Data from Auxiliary Table 24

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    Cutflow for the reference point DM+$tj$ $m(\phi, \chi) = (10, 1)$ GeV in signal region SRWX. The column labelled 'weighted'...

  • Auxiliary Table 25

    Data from Auxiliary Table 25

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    Cutflow for the reference point DM+$tj$ $m(\phi, \chi) = (10, 1)$ GeV in signal region SRTX. The column labelled 'weighted'...

  • Auxiliary Table 26

    Data from Auxiliary Table 26

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    Cutflow for the reference point DM+$tj$ $m(a, \chi) = (10, 1)$ GeV in signal region SR0X. The column labelled 'weighted'...

  • Auxiliary Table 27

    Data from Auxiliary Table 27

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    Cutflow for the reference point DM+$tj$ $m(a, \chi) = (10, 1)$ GeV in signal region SRWX. The column labelled 'weighted'...

  • Auxiliary Table 28

    Data from Auxiliary Table 28

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    Cutflow for the reference point DM+$tj$ $m(a, \chi) = (10, 1)$ GeV in signal region SRTX. The column labelled 'weighted'...

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