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Search for light long-lived neutral particles produced in $pp$ collisions at $\sqrt{s} =$ 13 TeV and decaying into collimated leptons or light hadrons with the ATLAS detector

The collaboration
Eur.Phys.J.C 80 (2020) 450, 2020.

Abstract (data abstract)
CERN-LHC. Search for long-lived dark photons produced from the decay of a Higgs boson or a heavy scalar boson and decaying into displaced collimated Standard Model fermions. The search uses data corresponding to an integrated luminosity of 36.1/fb collected in proton-proton collisions at 13 TeV center-of-mass energy and recorded in 2015-2016 with the ATLAS detector at the Large Hadron Collider. The observed number of events is consistent with the expected background, and limits on the production cross section times branching fraction as a function of the proper decay length of the dark photon are reported. Detection efficiency as a function of the proper decay lenght are also reported.

• #### Table 1

Data from Figure 5a

10.17182/hepdata.91132.v1/t1

Upper limits at 95% CL on the cross section times branching fraction for the process $H \to 2\gamma_d + X$...

• #### Table 2

Data from Figure 5b

10.17182/hepdata.91132.v1/t2

Upper limits at 95% CL on the cross section times branching fraction for the process $H \to 4\gamma_d + X$...

• #### Table 3

Data from Figure 6a

10.17182/hepdata.91132.v1/t3

Upper limits at 95% CL on the cross section times branching fraction for the process $H \to 2\gamma_d + X$...

• #### Table 4

Data from Figure 6b

10.17182/hepdata.91132.v1/t4

Upper limits at 95% CL on the cross section times branching fraction for the process $H \to 2\gamma_d + X$...

• #### Table 5

Data from Figure 9 of auxiliary material

10.17182/hepdata.91132.v1/t5

Upper limits at 95% CL on the cross section times branching fraction for the process $H \to 2\gamma_d + X$...

• #### Table 6

Data from Figure 10a of auxiliary material

10.17182/hepdata.91132.v1/t6

Upper limits at 95% CL on the cross section times branching fraction for the process $H \to 4\gamma_d + X$...

• #### Table 7

Data from Figure 10b of auxiliary material

10.17182/hepdata.91132.v1/t7

Upper limits at 95% CL on the cross section times branching fraction for the process $H \to 4\gamma_d + X$...

• #### Table 8

Data from Figure 10c of auxiliary material

10.17182/hepdata.91132.v1/t8

Upper limits at 95% CL on the cross section times branching fraction for the process $H \to 4\gamma_d + X$...

• #### Table 9

Data from Figure 4a

10.17182/hepdata.91132.v1/t9

• #### Table 11

Data from Figure 4a

10.17182/hepdata.91132.v1/t11

• #### Table 13

Data from Figure 4b

10.17182/hepdata.91132.v1/t13

• #### Table 15

Data from Figure 4b

10.17182/hepdata.91132.v1/t15

• #### Table 17

Data from Figure 4c

10.17182/hepdata.91132.v1/t17

• #### Table 19

Data from Figure 4c

10.17182/hepdata.91132.v1/t19

Extrapolated signal efficiencies as a function of proper decay length of the dark photon for the \$H \to 4\gamma_d +...