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Search for dark matter in association with an energetic photon in $pp$ collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector

The collaboration
JHEP 02 (2021) 226, 2021.

Abstract (data abstract)
CERN-LHC, ATLAS. A search for dark matter is conducted in final states containing a photon and missing transverse momentum in proton-proton collisions at 13 TeV. The data, collected during 2015-2018 by the ATLAS experiment at the CERN LHC, correspond to an integrated luminosity of 139 fb$^{-1}$. No deviations are observed relative to the predictions of the Standard Model. The results are interpreted as exclusion limits in models where weakly interacting dark-matter candidates are pair-produced via an axial-vector or a vector mediator in the s-channel. Results are also expressed in terms of 95% confidence level limits on the parameters of a model with an axion-like particle produced in association with a photon.

• #### Missign Transverse Momentum - SRs

Data from Figure 4 (top left).

10.17182/hepdata.96846.v2/t1

Distribution of $E^{miss}_T$ in data and for the expected SM background in the SRs after performing the 'simplified shape fit'....

• #### Missign Transverse Momentum - Single-Muon CR

Data from Figure 4 (top right).

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Distribution of $E^{miss}_T$ in data and for the expected SM background in the Single-Muon CR after performing the 'simplified shape...

• #### Missign Transverse Momentum - Two-Muon CR

Data from Figure 4 (bottom left).

10.17182/hepdata.96846.v2/t3

Distribution of $E^{miss}_T$ in data and for the expected SM background in the Two-Muon CR after performing the 'simplified shape...

• #### Missign Transverse Momentum - Two-Electron CR

Data from Figure 4 (bottom right).

10.17182/hepdata.96846.v2/t4

Distribution of $E^{miss}_T$ in data and for the expected SM background in the Two-Electron CR after performing the 'simplified shape...

• #### Observed exclusion for A1 model

Data from Figure 5 (top left).

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The observed exclusion contours on the $m_{\chi} - m_{med}$ plane for a simplified DM model involving an axial-vector mediator with...

• #### Expected exclusion A1 model

Data from Figure 5 (top left).

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The expected exclusion contours on the $m_{\chi} - m_{med}$ plane for a simplified DM model involving an axial-vector mediator with...

• #### Expected + 1 sigma exclusion for A1 model

Data from Figure 5 (top left).

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The expected + 1 sigma exclusion contours on the $m_{\chi} - m_{med}$ plane for a simplified DM model involving an...

• #### Expected - 1 sigma exclusion for A1 model

Data from Figure 5 (top left).

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The expected - 1 sigma exclusion contours on the $m_{\chi} - m_{med}$ plane for a simplified DM model involving an...

• #### Observed exclusion for A2 model

Data from Figure 5 (top right).

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The observed exclusion contours on the $m_{\chi} - m_{med}$ plane for a simplified DM model involving an axial-vector mediator with...

• #### Expected exclusion for A2 model

Data from Figure 5 (top right).

10.17182/hepdata.96846.v2/t10

The expected exclusion contours on the $m_{\chi} - m_{med}$ plane for a simplified DM model involving an axial-vector mediator with...

• #### Expected + 1 sigma exclusion A2 model

Data from Figure 5 (top right).

10.17182/hepdata.96846.v2/t11

The expected + 1 sigma exclusion contours on the $m_{\chi} - m_{med}$ plane for a simplified DM model involving an...

• #### Expected - 1 sigma exclusion for A2 model

Data from Figure 5 (top right).

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The expected - 1 sigma exclusion contours on the $m_{\chi} - m_{med}$ plane for a simplified DM model involving an...

• #### Observed exclusion contour for vector mediator, V1 model

Data from Figure 5 (bottom left).

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The observed exclusion contours on the $m_{\chi} - m_{med}$ plane for a vector mediator with couplings $g_{\chi}$ = 1, $g_q$...

• #### Expected exclusion for V1 model

Data from Figure 5 (bottom left).

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The expected exclusion contours on the $m_{\chi} - m_{med}$ plane for a vector mediator with couplings $g_{\chi}$ = 1, $g_q$...

• #### Expected + 1 sigma exclusion for V1 model

Data from Figure 5 (bottom left).

10.17182/hepdata.96846.v2/t15

The expected + 1 sigma exclusion contours on the $m_{\chi} - m_{med}$ plane for a vector mediator with couplings $g_{\chi}$...

• #### Expected - 1 sigma exclusion for V1 model

Data from Figure 5 (bottom left).

10.17182/hepdata.96846.v2/t16

The expected - 1 sigma exclusion contours on the $m_{\chi} - m_{med}$ plane for a vector mediator with couplings $g_{\chi}$...

• #### Observed exclusion for vector mediator, V2 model

Data from Figure 5 (bottom right).

10.17182/hepdata.96846.v2/t17

The observed exclusion contours on the $m_{\chi} - m_{med}$ plane for a vector mediator with couplings and $g_{\chi}$ = 1,...

• #### Expected exclusion for vector mediator, V2 model

Data from Figure 5 (bottom right).

10.17182/hepdata.96846.v2/t18

The expected exclusion contours on the $m_{\chi} - m_{med}$ plane for a vector mediator with couplings $g_{\chi}$ = 1, $g_q$...

• #### Expected + 1 sigma exclusion contour for V2 model

Data from Figure 5 (bottom right).

10.17182/hepdata.96846.v2/t19

The expected + 1 sigma exclusion contours on the $m_{\chi} - m_{med}$ plane for a vector mediator with couplings $g_{\chi}$...

• #### Expected - 1 sigma exclusion for V2 model

Data from Figure 5 (bottom right).

10.17182/hepdata.96846.v2/t20

The expected - 1 sigma exclusion contours on the $m_{\chi} - m_{med}$ plane for a vector mediator with couplings $g_{\chi}$...

• #### Exclusion on $\chi$-proton for A1 model.

Data from Figure 6 (top left).

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The 90% CL exclusion limit on $\chi$-proton spin-dependent scattering cross section in an axial-vector model with couplings $g_{\chi}$ = 1,...

• #### Exclusion on $\chi$-neutron for A1 model.

Data from Figure 6 (top right).

10.17182/hepdata.96846.v2/t22

The 90% CL exclusion limit on $\chi$-neutron spin-dependent scattering cross section in an axial-vector model with couplings $g_{\chi}$ = 1,...

• #### Exclusion on $\chi$-nucleon for V1 model, spin-independent.

Data from Figure 6 (bottom).

10.17182/hepdata.96846.v2/t23

The 90% CL exclusion limit on $\chi$-nucleon spin-independent scattering cross section in a vector model with couplings $g_{\chi}$ = 1,...

• #### ALPs observed and expected exclusion.

Data from Figure 7.

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Observed and expected exclusion at 95% CL on the coupling $c_W$ as a function of the effective scale $f_a$ for...

• #### Observed upper limits on signal strenght for A1 model.

Data from Figure 1 (Auxiliary matterial).

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

• #### Observed upper limits on cross section for A1 model.

Data from Figure 2 (Auxiliary matterial).

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The observed 95% CL upper limits on cross section for a simplified model of dark matter production involving an axial-vector...

• #### Acceptance for A1 model in inclusive SRs

Data from Table 2 (Auxiliary matterial).

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Acceptance in % for a simplified model of dark matter production involving an axial-vector operator with couplings $g_{\chi}$ = 1,...

• #### Acceptance for A1 model in exclusive SR.

Data from Table 3 (Auxiliary matterial).

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Acceptance in % for a simplified model of dark matter production involving an axial-vector operator with couplings $g_{\chi}$ = 1,...

• #### Efficiencies for A1 model in inclusive SRs

Data from Table 4 (Auxiliary matterial).

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Efficiencies for a simplified model of dark matter production involving an axial-vector operator with couplings $g_{\chi}$ = 1, $g_q$ =...

• #### Efficiencies for A1 model in exclusive SRs.

Data from Table 5 (Auxiliary matterial).

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Efficiencies for a simplified model of dark matter production involving an axial-vector operator with couplings $g_{\chi}$ = 1, $g_q$ =...

Version 2 modifications: Table 21 "Exclusion on χ-proton for A1 model" that shows data from Figure 6 (top left) was updated so that the 90% CL exclusion limit is displayed only in the regime where the theory is perturbative.