Expected event yields in each $m_{jj}$ bin for the different background processes in the SR of the VTR category, in the 2017 and 2018 samples. The background yields and the corresponding uncertainties are obtained after performing a combined fit across all of the CRs and SR. The expected signal contributions for a Higgs boson, produced in the non-VBF and VBF modes, decaying to invisible particles with a branching fraction of $\mathcal{B}(\text{H} \to \text{inv}) = 1$, and the observed event yields are also reported.

Event yields for the postfit background model from the background-only and signal-plus-background fits, as well as the observed event yields for MTR, 2017, signal region. All signal and control regions from the 2017 and 2018 data sets are included in the fit.

Event yields for the postfit background model from the background-only and signal-plus-background fits, as well as the observed event yields for MTR, 2017, dimuon region. All signal and control regions from the 2017 and 2018 data sets are included in the fit.

Event yields for the postfit background model from the background-only and signal-plus-background fits, as well as the observed event yields for MTR, 2018, signal region. All signal and control regions from the 2017 and 2018 data sets are included in the fit.

Event yields for the postfit background model from the background-only and signal-plus-background fits, as well as the observed event yields for MTR, 2018, dimuon region. All signal and control regions from the 2017 and 2018 data sets are included in the fit.

Event yields for the postfit background model from the background-only and signal-plus-background fits, as well as the observed event yields for VTR, 2017, signal region. All signal and control regions from the 2017 and 2018 data sets are included in the fit.

Event yields for the postfit background model from the background-only and signal-plus-background fits, as well as the observed event yields for VTR, 2017, dimuon region. All signal and control regions from the 2017 and 2018 data sets are included in the fit.

Event yields for the postfit background model from the background-only and signal-plus-background fits, as well as the observed event yields for VTR, 2018, signal region. All signal and control regions from the 2017 and 2018 data sets are included in the fit.

Event yields for the postfit background model from the background-only and signal-plus-background fits, as well as the observed event yields for VTR, 2018, single electron region. All signal and control regions from the 2017 and 2018 data sets are included in the fit.

Event yields for the postfit background model from the background-only and signal-plus-background fits, as well as the observed event yields for VTR, 2018, dielectron region. All signal and control regions from the 2017 and 2018 data sets are included in the fit.

Event yields for the postfit background model from the background-only and signal-plus-background fits, as well as the observed event yields for VTR, 2018, dimuon region. All signal and control regions from the 2017 and 2018 data sets are included in the fit.

Event yields for the postfit background model from the background-only and signal-plus-background fits, as well as the observed event yields for MTR, 2017, photon region. All signal and control regions from the 2017 and 2018 data sets are included in the fit.

Event yields for the postfit background model from the background-only and signal-plus-background fits, as well as the observed event yields for MTR, 2018, photon region. All signal and control regions from the 2017 and 2018 data sets are included in the fit.

Event yields for the postfit background model from the background-only and signal-plus-background fits, as well as the observed event yields for MTR, 2017, single electron region. All signal and control regions from the 2017 and 2018 data sets are included in the fit.

Event yields for the postfit background model from the background-only and signal-plus-background fits, as well as the observed event yields for MTR, 2017, single muon region. All signal and control regions from the 2017 and 2018 data sets are included in the fit.

Event yields for the postfit background model from the background-only and signal-plus-background fits, as well as the observed event yields for MTR, 2017, dielectron region. All signal and control regions from the 2017 and 2018 data sets are included in the fit.

Event yields for the postfit background model from the background-only and signal-plus-background fits, as well as the observed event yields for MTR, 2018, single electron region. All signal and control regions from the 2017 and 2018 data sets are included in the fit.

Event yields for the postfit background model from the background-only and signal-plus-background fits, as well as the observed event yields for MTR, 2018, single muon region. All signal and control regions from the 2017 and 2018 data sets are included in the fit.

Event yields for the postfit background model from the background-only and signal-plus-background fits, as well as the observed event yields for MTR, 2018, dielectron region. All signal and control regions from the 2017 and 2018 data sets are included in the fit.

Event yields for the postfit background model from the background-only and signal-plus-background fits, as well as the observed event yields for VTR, 2017, single electron region. All signal and control regions from the 2017 and 2018 data sets are included in the fit.

Event yields for the postfit background model from the background-only and signal-plus-background fits, as well as the observed event yields for VTR, 2017, single muon region. All signal and control regions from the 2017 and 2018 data sets are included in the fit.

Event yields for the postfit background model from the background-only and signal-plus-background fits, as well as the observed event yields for VTR, 2017, dielectron region. All signal and control regions from the 2017 and 2018 data sets are included in the fit.

Event yields for the postfit background model from the background-only and signal-plus-background fits, as well as the observed event yields for VTR, 2018, single muon region. All signal and control regions from the 2017 and 2018 data sets are included in the fit.

Trigger efficiency measured as a function of $p_{T}^{miss}$ in data for the 2017 and 2018 samples for the MTR category. The efficiency is measured in a phase space with at least two jets in which the leading (trailing) jet has $p_{T}>80~\text{GeV}$ ($>40~\text{GeV}$). The two jets are required to form a system with $m_{jj}>200~\text{GeV}$ and $\Delta\Phi_{jj}<1.5$.

Trigger efficiency measured as a function of $p_{T}^{miss}$ in data for the 2017 and 2018 samples for the MTR category. The efficiency is measured in a phase space with at least two jets in which the leading (trailing) jet has $p_{T}>140~\text{GeV}$ ($>70~\text{GeV}$). The two jets are required to form a system with $m_{jj}>900~\text{GeV}$ and $\Delta\Phi_{jj}<1.8$.

Background-only post-fit $p_{T}^{miss}$ distributions for the CRs of the SL selection. The total theory signal (t/t+DM and tt+DM summed together) is negligible and therefore is not shown. The last bin contains overflow events.

Background-only post-fit $p_{T}^{miss}$ distributions for the CRs of the SL selection. The total theory signal (t/t+DM and tt+DM summed together) is negligible and therefore is not shown. The last bin contains overflow events.

Background-only post-fit $p_{T}^{miss}$ distributions for the CRs of the AH selection. The total theory signal (t/t+DM and tt+DM summed together) is negligible and therefore is not shown. The last bin contains overflow events.

Background-only post-fit $p_{T}^{miss}$ distributions for the CRs of the AH selection. The total theory signal (t/t+DM and tt+DM summed together) is negligible and therefore is not shown. The last bin contains overflow events.

Background-only post-fit $p_{T}^{miss}$ distributions for the CRs of the AH selection. The total theory signal (t/t+DM and tt+DM summed together) is negligible and therefore is not shown. The last bin contains overflow events.

Background-only post-fit $p_{T}^{miss}$ distributions for the CRs of the AH selection. The total theory signal (t/t+DM and tt+DM summed together) is negligible and therefore is not shown. The last bin contains overflow events.

Background-only post-fit $p_{T}^{miss}$ distributions for the CRs of the AH selection. The total theory signal (t/t+DM and tt+DM summed together) is negligible and therefore is not shown. The last bin contains overflow events.

Background-only post-fit $p_{T}^{miss}$ distributions for the CRs of the AH selection. The total theory signal (t/t+DM and tt+DM summed together) is negligible and therefore is not shown. The last bin contains overflow events.

Background-only post-fit $p_{T}^{miss}$ distributions for the SRs of the SL selection. The total theory signal (t/t+DM and tt+DM summed together) is presented by the red solid lines for a scalar mediator mass of 100 GeV. The last bin contains overflow events.

Background-only post-fit $p_{T}^{miss}$ distributions for the SRs of the SL selection. The total theory signal (t/t+DM and tt+DM summed together) is presented by the red solid lines for a scalar mediator mass of 100 GeV. The last bin contains overflow events.

Background-only post-fit $p_{T}^{miss}$ distributions for the SRs of the SL selection. The total theory signal (t/t+DM and tt+DM summed together) is presented by the red solid lines for a scalar mediator mass of 100 GeV. The last bin contains overflow events.

Background-only post-fit $p_{T}^{miss}$ distributions for the SRs of the SL selection. The total theory signal (t/t+DM and tt+DM summed together) is presented by the red solid lines for a scalar mediator mass of 100 GeV. The last bin contains overflow events.

Background-only post-fit $p_{T}^{miss}$ distributions for the SRs of the SL selection. The total theory signal (t/t+DM and tt+DM summed together) is presented by the red solid lines for a scalar mediator mass of 100 GeV. The last bin contains overflow events.

Background-only post-fit $p_{T}^{miss}$ distributions for the SRs of the SL selection. The total theory signal (t/t+DM and tt+DM summed together) is presented by the red solid lines for a scalar mediator mass of 100 GeV. The last bin contains overflow events.

Background-only post-fit $p_{T}^{miss}$ distributions for the SRs of the AH selection. The total theory signal (t/t+DM and tt+DM summed together) is presented by the red solid lines for a scalar mediator mass of 100 GeV. The last bin contains overflow events.

Background-only post-fit $p_{T}^{miss}$ distributions for the SRs of the AH selection. The total theory signal (t/t+DM and tt+DM summed together) is presented by the red solid lines for a scalar mediator mass of 100 GeV. The last bin contains overflow events.

Background-only post-fit $p_{T}^{miss}$ distributions for the SRs of the AH selection. The total theory signal (t/t+DM and tt+DM summed together) is presented by the red solid lines for a scalar mediator mass of 100 GeV. The last bin contains overflow events.

The expected and observed 95% CL limits on the DM production cross sections, relative to the theory predictions, shown for the scalar models.

The expected and observed 95% CL limits on the DM production cross sections, relative to the theory predictions, shown for the pseudoscalar models.

Cross sections of the t+DM and tt+DM processes, for different mediator and dark matter masses. The scalar hypothesis is considered. The t+DM processes are split by production mode (t-, s-, and tW-channels). The sum of the three is also provided.

Cross sections of the t+DM and tt+DM processes, for different mediator and dark matter masses. The pseudoscalar hypothesis is considered. The t+DM processes are split by production mode (t-, s-, and tW-channels). The sum of the three is also provided.