Abstract (data abstract)

A search for events with a dark photon produced in association with a dark Higgs boson via rare decays of the Standard Model $Z$ boson is presented, using $139~fb^{-1}$ of $\sqrt{s} = 13$ TeV proton--proton collision data recorded by the ATLAS detector at the Large Hadron Collider. The dark Higgs boson decays into a pair of dark photons, and at least two of the three dark photons must each decay into a pair of electrons or muons, resulting in at least two same-flavor opposite-charge lepton pairs in the final state. The data are found to be consistent with the background prediction, and upper limits are set on the dark photon's coupling to the dark Higgs boson times the kinetic mixing between the Standard Model photon and the dark photon, $\alpha_{D}\epsilon^2$, in the dark photon mass range of $[5, 40]$ GeV except for the $\Upsilon$ mass window $[8.8, 11.1]$ GeV. This search explores new parameter space not previously excluded by other experiments.

Table 1

Data from Figure 3

10.17182/hepdata.140310.v1/t1

Observed and expected upper limits at 95% CL on the production cross-section times branching fraction as a function of $m_{A'}$...
Table 2

Data from Figure 3

10.17182/hepdata.140310.v1/t2

Observed and expected upper limits at 95% CL on the production cross-section times branching fraction as a function of $m_{A'}$...
Table 3

Data from Figure 3

10.17182/hepdata.140310.v1/t3

Observed and expected upper limits at 95% CL on the production cross-section times branching fraction as a function of $m_{A'}$...
Table 4

Data from Figure 3

10.17182/hepdata.140310.v1/t4

Observed and expected upper limits at 95% CL on the production cross-section times branching fraction as a function of $m_{A'}$...
Table 5

Data from Figure 3

10.17182/hepdata.140310.v1/t5

Observed and expected upper limits at 95% CL on the production cross-section times branching fraction as a function of $m_{A'}$...
Table 6

Data from Figure 3

10.17182/hepdata.140310.v1/t6

Observed and expected upper limits at 95% CL on the production cross-section times branching fraction as a function of $m_{A'}$...
Table 7

Data from Figure 4

10.17182/hepdata.140310.v1/t7

Observed 90% CL upper limits on $\alpha_{D}\epsilon^{2}$ as a function of $m_{A'}$ at dark Higgs boson mass of 20 GeV
Table 8

Data from Figure 4

10.17182/hepdata.140310.v1/t8

Observed 90% CL upper limits on $\alpha_{D}\epsilon^{2}$ as a function of $m_{A'}$ at dark Higgs boson mass of 30 GeV
Table 9

Data from Figure 4

10.17182/hepdata.140310.v1/t9

Observed 90% CL upper limits on $\alpha_{D}\epsilon^{2}$ as a function of $m_{A'}$ at dark Higgs boson mass of 40 GeV
Table 10

Data from Figure 4

10.17182/hepdata.140310.v1/t10

Observed 90% CL upper limits on $\alpha_{D}\epsilon^{2}$ as a function of $m_{A'}$ at dark Higgs boson mass of 50 GeV
Table 11

Data from Figure 4

10.17182/hepdata.140310.v1/t11

Observed 90% CL upper limits on $\alpha_{D}\epsilon^{2}$ as a function of $m_{A'}$ at dark Higgs boson mass of 60 GeV
Table 12

Data from Figure 4

10.17182/hepdata.140310.v1/t12

Observed 90% CL upper limits on $\alpha_{D}\epsilon^{2}$ as a function of $m_{A'}$ at dark Higgs boson mass of 70 GeV
Table 13

Data from Figure 5

10.17182/hepdata.140310.v1/t13

Observed 90% CL upper limits on $\epsilon^{2}$, assuming of $\alpha_{D}=0.1$, as a function of $m_{A'}$ at dark Higgs boson mass...
Table 14

Data from Figure 5

10.17182/hepdata.140310.v1/t14

Observed 90% CL upper limits on $\epsilon^{2}$, assuming of $\alpha_{D}=0.1$, as a function of $m_{A'}$ at dark Higgs boson mass...
Table 15

Data from Figure 5

10.17182/hepdata.140310.v1/t15

Observed 90% CL upper limits on $\epsilon^{2}$, assuming of $\alpha_{D}=0.1$, as a function of $m_{A'}$ at dark Higgs boson mass...
Table 16

Data from Figure 5

10.17182/hepdata.140310.v1/t16

Observed 90% CL upper limits on $\epsilon^{2}$, assuming of $\alpha_{D}=0.1$, as a function of $m_{A'}$ at dark Higgs boson mass...
Table 17

Data from Figure 5

10.17182/hepdata.140310.v1/t17

Observed 90% CL upper limits on $\epsilon^{2}$, assuming of $\alpha_{D}=0.1$, as a function of $m_{A'}$ at dark Higgs boson mass...
Table 18

Data from Figure 5

10.17182/hepdata.140310.v1/t18

Observed 90% CL upper limits on $\epsilon^{2}$, assuming of $\alpha_{D}=0.1$, as a function of $m_{A'}$ at dark Higgs boson mass...
Table 19

Data from Figure 6

10.17182/hepdata.140310.v1/t19

Observed and expected upper limits at 95% CL on the branching fraction as a function of $m_{A'}$ at dark Higgs...
Table 20

Data from Figure 6

10.17182/hepdata.140310.v1/t20

Observed and expected upper limits at 95% CL on the branching fraction as a function of $m_{A'}$ at dark Higgs...
Table 21

Data from Figure 6

10.17182/hepdata.140310.v1/t21

Observed and expected upper limits at 95% CL on the branching fraction as a function of $m_{A'}$ at dark Higgs...
Table 22

Data from Figure 6

10.17182/hepdata.140310.v1/t22

Observed and expected upper limits at 95% CL on the branching fraction as a function of $m_{A'}$ at dark Higgs...
Table 23

Data from Figure 6

10.17182/hepdata.140310.v1/t23

Observed and expected upper limits at 95% CL on the branching fraction as a function of $m_{A'}$ at dark Higgs...
Table 24

Data from Figure 6

10.17182/hepdata.140310.v1/t24

Observed and expected upper limits at 95% CL on the branching fraction as a function of $m_{A'}$ at dark Higgs...
Table 25

Data from Auxiliary Figure 1

10.17182/hepdata.140310.v1/t25

Observed and expected upper limits at 95% CL on $\alpha_{D}\epsilon^{2}$ as a function of $m_{A'}$ at dark Higgs boson mass...
Table 26

Data from Auxiliary Figure 1

10.17182/hepdata.140310.v1/t26

Observed and expected upper limits at 95% CL on $\alpha_{D}\epsilon^{2}$ as a function of $m_{A'}$ at dark Higgs boson mass...
Table 27

Data from Auxiliary Figure 1

10.17182/hepdata.140310.v1/t27

Observed and expected upper limits at 95% CL on $\alpha_{D}\epsilon^{2}$ as a function of $m_{A'}$ at dark Higgs boson mass...
Table 28

Data from Auxiliary Figure 1

10.17182/hepdata.140310.v1/t28

Observed and expected upper limits at 95% CL on $\alpha_{D}\epsilon^{2}$ as a function of $m_{A'}$ at dark Higgs boson mass...
Table 29

Data from Auxiliary Figure 1

10.17182/hepdata.140310.v1/t29

Observed and expected upper limits at 95% CL on $\alpha_{D}\epsilon^{2}$ as a function of $m_{A'}$ at dark Higgs boson mass...
Table 30

Data from Auxiliary Figure 1

10.17182/hepdata.140310.v1/t30

Observed and expected upper limits at 95% CL on $\alpha_{D}\epsilon^{2}$ as a function of $m_{A'}$ at dark Higgs boson mass...

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