HEPData Search

Table 1

Observed ETmiss distribution in the ee channel compared to the signal and background predictions. The error band shows the total statistical and systematic uncertainty on the background prediction. The background predictions are presented as they are before being fit to the data. The ratio plot gives the observed data yield over the background prediction (black points) as well as the signal-plus-background contribution divided by the background prediction (blue or purple line) in each ETmiss bin. The rightmost bin contains the overflow contributions. The ZH → ℓℓ + inv signal distribution is shown with BRH → inv =0.3, which is the value most compatible with data. The simulated DM distribution with mmed = 500 GeV and mχ = 100 GeV is also scaled (with a factor of 0.27) to the best-fit contribution.

Table 2

Observed ETmiss distribution in the μμ channel compared to the signal and background predictions. The error band shows the total statistical and systematic uncertainty on the background prediction. The background predictions are presented as they are before being fit to the data. The ratio plot gives the observed data yield over the background prediction (black points) as well as the signal-plus-background contribution divided by the background prediction (blue or purple line) in each ETmiss bin. The rightmost bin contains the overflow contributions. The ZH → ℓℓ + inv signal distribution is shown with BRH → inv =0.3, which is the value most compatible with data. The simulated DM distribution with mmed = 500 GeV and mχ = 100 GeV is also scaled (with a factor of 0.27) to the best-fit contribution.

Table 3

DM exclusion limit in the two-dimensional phase space of WIMP mass mχ vs mediator mass mmed determined using the combined ee+μμ channel. Both the observed and expected limits are presented, and the 1σ uncertainty band for the expected limits is also provided. Regions bounded by the limit curves are excluded at the 95% CL. The grey line labelled with "mmed = 2mχ'' indicates the kinematic threshold where the mediator can decay on-shell into WIMPs, and the other grey line gives the perturbative limit (arXiv 1603.04156). The relic density line (arXiv 1603.04156) illustrates the combination of mχ and mmed that would explain the observed DM relic density.

Table 4

DM exclusion limit in the two-dimensional phase space of WIMP mass mχ vs mediator mass mmed determined using the combined ee+μμ channel. Both the observed and expected limits are presented, and the 1σ uncertainty band for the expected limits is also provided. Regions bounded by the limit curves are excluded at the 95% CL. The grey line labelled with "mmed = 2mχ'' indicates the kinematic threshold where the mediator can decay on-shell into WIMPs, and the other grey line gives the perturbative limit (arXiv 1603.04156). The relic density line (arXiv 1603.04156) illustrates the combination of mχ and mmed that would explain the observed DM relic density.

Table 5

DM exclusion limit in the two-dimensional phase space of WIMP mass mχ vs mediator mass mmed determined using the combined ee+μμ channel. Both the observed and expected limits are presented, and the 1σ uncertainty band for the expected limits is also provided. Regions bounded by the limit curves are excluded at the 95% CL. The grey line labelled with "mmed = 2mχ'' indicates the kinematic threshold where the mediator can decay on-shell into WIMPs, and the other grey line gives the perturbative limit (arXiv 1603.04156). The relic density line (arXiv 1603.04156) illustrates the combination of mχ and mmed that would explain the observed DM relic density.

Table 6

DM exclusion limit in the two-dimensional phase space of WIMP mass mχ vs mediator mass mmed determined using the combined ee+μμ channel. Both the observed and expected limits are presented, and the 1σ uncertainty band for the expected limits is also provided. Regions bounded by the limit curves are excluded at the 95% CL. The grey line labelled with "mmed = 2mχ'' indicates the kinematic threshold where the mediator can decay on-shell into WIMPs, and the other grey line gives the perturbative limit (arXiv 1603.04156). The relic density line (arXiv 1603.04156) illustrates the combination of mχ and mmed that would explain the observed DM relic density.

Table 7

The 95% CL upper limits on the production cross-section of the ZH process with the prompt Z→ ee and Z→ μμ decays and the invisible Higgs boson decays as a function of mH, obtained from the combined ee+μμ channel. The observed and expected limits are given, as well as the &pm;1σ and &pm;2σ error bands on the expected limits. The signal process is only modelled for the qq initial state, and the theory uncertainties on the signal prediction are not considered.

Table 8

DM exclusion limit in the two-dimensional phase space of mχ vs mmed set using the combined ee+μμ channel. The DM model assumes a vector mediator, a fermionic WIMP, and the coupling parameters gq = 0.25 and gχ = 1. Both the observed and expected limits are presented, and the 1σ uncertainty band for the expected limits is also provided. Regions bounded by the limit curves are excluded at the 95% CL. The grey line labelled with "mmed = 2mχ'' indicates the kinematic threshold where the mediator can decay on-shell into WIMPs. The relic density line [arXiv 1603.04156] illustrates the combination of mχ and mmed that would explain the observed DM relic density.

Table 9

DM exclusion limit in the two-dimensional phase space of mχ vs mmed set using the combined ee+μμ channel. The DM model assumes a vector mediator, a fermionic WIMP, and the coupling parameters gq = 0.25 and gχ = 1. Both the observed and expected limits are presented, and the 1σ uncertainty band for the expected limits is also provided. Regions bounded by the limit curves are excluded at the 95% CL. The grey line labelled with "mmed = 2mχ'' indicates the kinematic threshold where the mediator can decay on-shell into WIMPs. The relic density line [arXiv 1603.04156] illustrates the combination of mχ and mmed that would explain the observed DM relic density.

Table 10

DM exclusion limit in the two-dimensional phase space of mχ vs mmed set using the combined ee+μμ channel. The DM model assumes a vector mediator, a fermionic WIMP, and the coupling parameters gq = 0.25 and gχ = 1. Both the observed and expected limits are presented, and the 1σ uncertainty band for the expected limits is also provided. Regions bounded by the limit curves are excluded at the 95% CL. The grey line labelled with "mmed = 2mχ'' indicates the kinematic threshold where the mediator can decay on-shell into WIMPs. The relic density line [arXiv 1603.04156] illustrates the combination of mχ and mmed that would explain the observed DM relic density.

Table 11

DM exclusion limit in the two-dimensional phase space of mχ vs mmed set using the combined ee+μμ channel. The DM model assumes a vector mediator, a fermionic WIMP, and the coupling parameters gq = 0.25 and gχ = 1. Both the observed and expected limits are presented, and the 1σ uncertainty band for the expected limits is also provided. Regions bounded by the limit curves are excluded at the 95% CL. The grey line labelled with "mmed = 2mχ'' indicates the kinematic threshold where the mediator can decay on-shell into WIMPs. The relic density line [arXiv 1603.04156] illustrates the combination of mχ and mmed that would explain the observed DM relic density.

Table 12

Limits on the WIMP and proton scattering cross section as a function of WIMP mass, obtained for simplified dark matter models with an axial-vector mediator (left) and a vector mediator (right). The solid black line shows the observed limit at the 90% confidence level from this search. The left plot incorporates the latest results from these competitive direct-search experiments, LUX [arXiv 1705.03380], PICO-2L [Phys. Rev. Lett. 114 (2015) 231302], and PICO-60 [arXiv 1702.07666]. The right plot incorporates the latest results from the following experiments, CRESST-II [Eur. Phys. J. C76 (2016) 25], CDMSlite [Phys. Rev. Lett. 116 (2016) 071301], PandaX-II [Phys. Rev. Lett. 117 (2016) 121303], LUX [Phys. Rev. Lett. 118 (2017) 021303], and XENON1T [arXiv 1705.06655].

Table 13

Limits on the WIMP and proton scattering cross section as a function of WIMP mass, obtained for simplified dark matter models with an axial-vector mediator (left) and a vector mediator (right). The solid black line shows the observed limit at the 90% confidence level from this search. The left plot incorporates the latest results from these competitive direct-search experiments, LUX [arXiv 1705.03380], PICO-2L [Phys. Rev. Lett. 114 (2015) 231302], and PICO-60 [arXiv 1702.07666]. The right plot incorporates the latest results from the following experiments, CRESST-II [Eur. Phys. J. C76 (2016) 25], CDMSlite [Phys. Rev. Lett. 116 (2016) 071301], PandaX-II [Phys. Rev. Lett. 117 (2016) 121303], LUX [Phys. Rev. Lett. 118 (2017) 021303], and XENON1T [arXiv 1705.06655].

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Search for an invisibly decaying Higgs boson or dark matter candidates produced in association with a $Z$ boson in $pp$ collisions at $\sqrt{s} =$ 13 TeV with the ATLAS detector