Abstract (data abstract)

CERN-LHC. A search is presented for long-lived neutral particles using 33 fb$^{-1}$ of $\sqrt{s} = 13$ TeV proton-proton collision data, collected during 2016 by the ATLAS detector at the LHC. This search focuses on a topology in which one long-lived particle decays in the ATLAS inner detector and the other decays in the muon spectrometer. Special techniques are required in order to reconstruct the displaced tracks and vertices in the inner detector and in the muon spectrometer. One event is observed that passes the full event selection, which is consistent with the background estimation. Limits are placed on scalar boson propagators of masses from 125 GeV to 1000 GeV decaying to pairs of hidden sector scalars of masses from 8 GeV to 400 GeV. The limits placed on several low mass scalars extend previous exclusion limits in the range of proper lifetimes from 5 cm to 1 m.

Table 1

Data from Figure 3A

10.17182/hepdata.92075.v1/t1

IDVx selection efficiency as a function of the radial decay position for $m_H = 125$ GeV.
Table 2

Data from Figure 3B

10.17182/hepdata.92075.v1/t2

IDVx selection efficiency as a function of the radial decay position for $m_s = 50$ GeV.
Table 3

Data from Figure 4A

10.17182/hepdata.92075.v1/t3

Observed $CL_S$ limits on $BR$ for $m_H = 125$ GeV.
Table 4

Data from Figure 4B

10.17182/hepdata.92075.v1/t4

Observed $CL_S$ limits on $\sigma \times BR$ for $m_{\Phi} = 200-400$ GeV.
Table 5

Data from Figure 4C

10.17182/hepdata.92075.v1/t5

Observed $CL_S$ limits on $\sigma \times BR$ for $m_{\Phi} = 600-1000$ GeV.
Table 6

Data from Figure 5A

10.17182/hepdata.92075.v1/t6

Combined limits from this analysis (ID) and the CR and MS analyses for $m_{H} = 125$ GeV, $m_s = 15$...
Table 7

Data from Figure 5B

10.17182/hepdata.92075.v1/t7

Combined limits from this analysis (ID) and the CR and MS analyses for $m_{H} = 125$ GeV, $m_s = 25$...
Table 8

Data from Figure 5C

10.17182/hepdata.92075.v1/t8

Combined limits from this analysis (ID) and the CR and MS analyses for $m_{H} = 125$ GeV, $m_s = 40$...
Table 9

Data from Figure 5D

10.17182/hepdata.92075.v1/t9

Combined limits from this analysis (ID) and the CR and MS analyses for $m_{H} = 125$ GeV, $m_s = 55$...
Table 10

Data from Figure 6A

10.17182/hepdata.92075.v1/t10

Combined limits from this analysis (ID) and the CR and MS analyses for $m_{\Phi} = 200$ GeV, $m_s = 25$...
Table 11

Data from Figure 6B

10.17182/hepdata.92075.v1/t11

Combined limits from this analysis (ID) and the CR and MS analyses for $m_{\Phi} = 200$ GeV, $m_s = 50$...
Table 12

Data from Auxillary Figure 1A

10.17182/hepdata.92075.v1/t12

Comparison of the IDVx reconstruction and selection efficiency for a Higgs with a mass of 125 GeV decaying to an...
Table 13

Data from Auxillary Figure 1B

10.17182/hepdata.92075.v1/t13

Comparison of the IDVx reconstruction and selection efficiency for a Higgs with a mass of 125 GeV decaying to an...
Table 14

Data from Auxillary Figure 2A

10.17182/hepdata.92075.v1/t14

Comparison of the IDVx reconstruction and selection efficiency for a $\Phi$ with a mass of 1000 GeV decaying to an...
Table 15

Data from Auxillary Figure 2B

10.17182/hepdata.92075.v1/t15

Comparison of the IDVx reconstruction and selection efficiency for a $\Phi$ with a mass of 1000 GeV decaying to an...
Table 16

Data from Auxillary Figure 3A

10.17182/hepdata.92075.v1/t16

The IDVx selection efficiency as a function of long-lived particle decay $z$ position for MC signal samples with a 125...
Table 17

Data from Auxillary Figure 3B

10.17182/hepdata.92075.v1/t17

The IDVx selection efficiency as a function of long-lived particle decay $z$ position for MC signal samples with mediators of...
Table 18

Data from Auxillary Figure 4A

10.17182/hepdata.92075.v1/t18

The impact of the IDVx selections on the selection efficiency for the MC signal sample with a Higgs with a...
Table 19

Data from Auxillary Figure 4B

10.17182/hepdata.92075.v1/t19

The impact of the IDVx selections on the selection efficiency for the MC signal sample with a Higgs with a...
Table 20

Data from Auxillary Figure 4C

10.17182/hepdata.92075.v1/t20

The impact of the IDVx selections on the selection efficiency for the MC signal sample with a Higgs with a...
Table 21

Data from Auxillary Figure 5A

10.17182/hepdata.92075.v1/t21

The impact of the IDVx selections on the selection efficiency for the MC signal sample with a $\Phi$ with a...
Table 22

Data from Auxillary Figure 5B

10.17182/hepdata.92075.v1/t22

The impact of the IDVx selections on the selection efficiency for the MC signal sample with a $\Phi$ with a...
Table 23

Data from Auxillary Figure 5C

10.17182/hepdata.92075.v1/t23

The impact of the IDVx selections on the selection efficiency for the MC signal sample with a $\Phi$ with a...
Table 24

Data from Auxillary Figure 6A

10.17182/hepdata.92075.v1/t24

The impact of the IDVx selections on the selection efficiency for the MC signal sample with a $\Phi$ with a...
Table 25

Data from Auxillary Figure 6B

10.17182/hepdata.92075.v1/t25

The impact of the IDVx selections on the selection efficiency for the MC signal sample with a $\Phi$ with a...
Table 26

Data from Auxillary Figure 6C

10.17182/hepdata.92075.v1/t26

The impact of the IDVx selections on the selection efficiency for the MC signal sample with a $\Phi$ with a...
Table 27

Data from Auxillary Figure 10A

10.17182/hepdata.92075.v1/t27

$CL_S$ limits on $B_{H\rightarrow ss}$ for $m_{H} = 125$ GeV, $m_s = 8$ GeV.
Table 28

Data from Auxillary Figure 10B

10.17182/hepdata.92075.v1/t28

$CL_S$ limits on $B_{H\rightarrow ss}$ for $m_{H} = 125$ GeV, $m_s = 15$ GeV.
Table 29

Data from Auxillary Figure 10C

10.17182/hepdata.92075.v1/t29

$CL_S$ limits on $B_{H\rightarrow ss}$ for $m_{H} = 125$ GeV, $m_s = 25$ GeV.
Table 30

Data from Auxillary Figure 10D

10.17182/hepdata.92075.v1/t30

$CL_S$ limits on $B_{H\rightarrow ss}$ for $m_{H} = 125$ GeV, $m_s = 40$ GeV.
Table 31

Data from Auxillary Figure 10E

10.17182/hepdata.92075.v1/t31

$CL_S$ limits on $B_{H\rightarrow ss}$ for $m_{H} = 125$ GeV, $m_s = 55$ GeV.
Table 32

Data from Auxillary Figure 11A

10.17182/hepdata.92075.v1/t32

$CL_S$ limits on $\sigma \times B_{\Phi\rightarrow ss}$ for $m_{\Phi} = 200$ GeV, $m_s = 8$ GeV.
Table 33

Data from Auxillary Figure 11B

10.17182/hepdata.92075.v1/t33

$CL_S$ limits on $\sigma \times B_{\Phi\rightarrow ss}$ for $m_{\Phi} = 200$ GeV, $m_s = 25$ GeV.
Table 34

Data from Auxillary Figure 11C

10.17182/hepdata.92075.v1/t34

$CL_S$ limits on $\sigma \times B_{\Phi\rightarrow ss}$ for $m_{\Phi} = 200$ GeV, $m_s = 50$ GeV.
Table 35

Data from Auxillary Figure 12A

10.17182/hepdata.92075.v1/t35

$CL_S$ limits on $\sigma \times B_{\Phi\rightarrow ss}$ for $m_{\Phi} = 400$ GeV, $m_s = 50$ GeV.
Table 36

Data from Auxillary Figure 12B

10.17182/hepdata.92075.v1/t36

$CL_S$ limits on $\sigma \times B_{\Phi\rightarrow ss}$ for $m_{\Phi} = 400$ GeV, $m_s = 100$ GeV.
Table 37

Data from Auxillary Figure 13A

10.17182/hepdata.92075.v1/t37

$CL_S$ limits on $\sigma \times B_{\Phi\rightarrow ss}$ for $m_{\Phi} = 600$ GeV, $m_s = 50$ GeV.
Table 38

Data from Auxillary Figure 13B

10.17182/hepdata.92075.v1/t38

$CL_S$ limits on $\sigma \times B_{\Phi\rightarrow ss}$ for $m_{\Phi} = 600$ GeV, $m_s = 150$ GeV.
Table 39

Data from Auxillary Figure 14A

10.17182/hepdata.92075.v1/t39

$CL_S$ limits on $\sigma \times B_{\Phi\rightarrow ss}$ for $m_{\Phi} = 1000$ GeV, $m_s = 50$ GeV.
Table 40

Data from Auxillary Figure 14B

10.17182/hepdata.92075.v1/t40

$CL_S$ limits on $\sigma \times B_{\Phi\rightarrow ss}$ for $m_{\Phi} = 1000$ GeV, $m_s = 150$ GeV.
Table 41

Data from Auxillary Figure 14C

10.17182/hepdata.92075.v1/t41

$CL_S$ limits on $\sigma \times B_{\Phi\rightarrow ss}$ for $m_{\Phi} = 1000$ GeV, $m_s = 400$ GeV.

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