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Search for dark matter at $\sqrt{s}=13$ TeV in final states containing an energetic photon and large missing transverse momentum with the ATLAS detector

The collaboration
Eur.Phys.J. C77 (2017) 393, 2017

Abstract (data abstract)
CERN-LHC. Results of a search for physics beyond the Standard Model in events containing an energetic photon and large missing transverse momentum with the ATLAS detector at the Large Hadron Collider are reported. As the number of events observed in data, corresponding to an integrated luminosity of 36.1 fb$^{-1}$ of proton-proton collisions at a centre-of-mass energy of 13 TeV, is in agreement with the Standard Model expectations, exclusion limits in models where dark-matter candidates are pair-produced are determined. For dark-matter production via an axial-vector or a vector mediator in the s-channel, this search excludes mediator masses below 750-1200 GeV for dark-matter candidate masses below 230-480 GeV at 95% confidence level, depending on the couplings. In an effective theory of dark-matter production, the limits restrict the value of the suppression scale $M_{*}$ to be above 790 GeV at 95% confidence level. A limit is also reported on the production of a high-mass scalar resonance by processes beyond the Standard Model, in which the resonance decays to $Z\gamma$ and the $Z$ boson subsequently decays into neutrinos.

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Data from Table 5

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Observed event yields in 36.1 fb$^{-1}$ of data compared to expected yields from SM backgrounds in all signal regions, as...

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Data from Figure 4a

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The observed 95% CL exclusion contour for a simplified model of dark-matter production involving an axial-vector operator, Dirac DM and...

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Data from Figure 4a

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The expected 95% CL exclusion contour (+1$\sigma$) for a simplified model of dark-matter production involving an axial-vector operator, Dirac DM...

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Data from Figure 4a

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The expected 95% CL exclusion contour (-1$\sigma$) for a simplified model of dark-matter production involving an axial-vector operator, Dirac DM...

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Data from Figure 4a

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The expected 95% CL exclusion contour for a simplified model of dark-matter production involving an axial-vector operator, Dirac DM and...

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Data from Figure 4b

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The observed 95% CL exclusion contour for a simplified model of dark-matter production involving an axial-vector operator, Dirac DM and...

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Data from Figure 4b

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The expected 95% CL exclusion contour (+1$\sigma$) for a simplified model of dark-matter production involving an axial-vector operator, Dirac DM...

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Data from Figure 4b

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The expected 95% CL exclusion contour (-1$\sigma$) for a simplified model of dark-matter production involving an axial-vector operator, Dirac DM...

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Data from Figure 4b

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The expected 95% CL exclusion contour for a simplified model of dark-matter production involving an axial-vector operator, Dirac DM and...

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Data from Figure 4c

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The observed 95% CL exclusion contour for a simplified model of dark-matter production involving a vector operator with couplings $g_{q}$...

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Data from Figure 4c

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The expected 95% CL exclusion contour ($+1\sigma$) for a simplified model of dark-matter production involving a vector operator with couplings...

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Data from Figure 4c

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The expected 95% CL exclusion contour ($-1\sigma$) for a simplified model of dark-matter production involving a vector operator with couplings...

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Data from Figure 4c

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The expected 95% CL exclusion contour for a simplified model of dark-matter production involving a vector operator with couplings $g_{q}$...

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Data from Figure 4d

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The observed 95% CL exclusion contour for a simplified model of dark-matter production involving for a vector operator with couplings...

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Data from Figure 4d

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The expected 95% CL exclusion contour ($+1\sigma$) for a simplified model of dark-matter production involving for a vector operator with...

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Data from Figure 4d

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The expected 95% CL exclusion contour ($-1\sigma$) for a simplified model of dark-matter production involving for a vector operator with...

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Data from Figure 4d

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The expected 95% CL exclusion contour for a simplified model of dark-matter production involving for a vector operator with couplings...

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Data from Figure 5a

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The 90% CL exclusion limit on the $\chi$-proton scattering cross section in a simplifed model of dark-matter production involving an...

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Data from Figure 5b

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The 90% CL exclusion limit on the $\chi$-nucleon scattering cross section in a simplifed model of dark-matter production involving a...

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Data from Figure 6

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The observed and expected 95% CL limits on M* for a dimension-7 operator EFT model with a contact interaction of...

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Data from Figure 7

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The observed and expected limit at 95% CL on the production cross section of a $Z\gamma$ resonance as a function...

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Data from Figure 9 (auxiliary material)

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The observed 95% CL upper limits on signal strength $\mu$, the ratio of the experimental limit to the predicted signal...

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Data from Figure 10 (auxiliary material)

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Acceptance, in %, for a simplified model of dark matter production involving an axial-vector operator, Dirac DM and couplings $g_{q}$=...

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Data from Figure 11 (auxiliary material)

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Fiducial reconstruction efficiencies in the three inclusive signal regions for a simplified model of dark matter production involving an axial-vector...