Abstract (data abstract)

This paper describes a search for pairs of neutral, long-lived particles with masses between $m_S= 5 ~\mathrm{GeV}$ and $40 ~\mathrm{GeV}$ that decay into Standard Model fermions in the ATLAS calorimeter. Such long-lived neutral particles occur in many extensions to the Standard Model. The analysis uses either $10.8 ~\mathrm{fb^{-1}}$ or $33.0 ~\mathrm{fb^{-1}}$ of data (depending on the trigger) recorded in 2016 at the LHC with the ATLAS detector in proton--proton collisions at a centre-of-mass energy of $13 ~\mathrm{TeV}$. No significant excess in data is observed, and limits are reported on the production cross section times branching ratio as a function of the proper decay length of the long-lived particles.

Table 1

Data from Figure 1 (left) in paper

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Trigger efficiency of simulated signal events as a function of the LLP $p_T$ for a selection of signal samples.
Table 2

Data from Figure 2 (left) in paper

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Trigger efficiency of simulated signal events as a function of the LLP decay position in the $x-y$ plane for LLPs...
Table 3

Data from Figure 2 (right) in paper

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Trigger efficiency of simulated signal events as a function of the LLP decay position in the $z$ direction for LLPs...
Table 4

Data from Table 1 (high-$E_T$) in paper

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Sequential impact of each requirement on the number of events passing the selection for the high-$E_T$ analysis.
Table 5

Data from Table 1 (low-$E_T$) in paper

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Sequential impact of each requirement on the number of events passing the selection for the low-$E_T$ analysis.
Table 6

Data from Table 3 in paper

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Application of the modified ABCD method to the final high-$E_T$ and low-$E_T$ selections.
Table 7

Data from Figure 7 (left) in paper

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The extrapolated signal efficiencies as a function of proper decay length of the $s$ for several simulated samples in the...
Table 8

Data from Figure 7 (right) in paper

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The extrapolated signal efficiencies as a function of proper decay length of the $s$ for several simulated samples in the...
Table 9

Data from Figure 8 (top) in paper

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The observed limits, expected limits and $\pm 1 \sigma$ and $\pm 2 \sigma$ bands for a model with $m_{\phi} =...
Table 10

Data from Figure 8 (bottom) in paper

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The observed limits, expected limits and $\pm 1 \sigma$ and $\pm 2 \sigma$ bands for a model with $m_{\phi} =...
Table 11

Data from Figure 10 (top) in paper

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Combined limits for the CalRatio and MS analyses, for a model with $m_{\phi} = 125 ~\mathrm{GeV}$ and $m_{s} = 25...
Table 12

Data from Figure 10 (bottom) in paper

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Combined limits for the CalRatio and MS analyses, for a model with $m_{\phi} = 600 ~\mathrm{GeV}$ and $m_{s} = 150...
Table 13

Data from Figure 6(a) in auxiliary material

10.17182/hepdata.86552.v1/t13

The observed limits, expected limits and $\pm 1 \sigma$ and $\pm 2 \sigma$ bands for a model with $m_{\phi} =...
Table 14

Data from Figure 6(b) in auxiliary material

10.17182/hepdata.86552.v1/t14

The observed limits, expected limits and $\pm 1 \sigma$ and $\pm 2 \sigma$ bands for a model with $m_{\phi} =...
Table 15

Data from Figure 6(c) in auxiliary material

10.17182/hepdata.86552.v1/t15

The observed limits, expected limits and $\pm 1 \sigma$ and $\pm 2 \sigma$ bands for a model with $m_{\phi} =...
Table 16

Data from Figure 6(d) in auxiliary material

10.17182/hepdata.86552.v1/t16

The observed limits, expected limits and $\pm 1 \sigma$ and $\pm 2 \sigma$ bands for a model with $m_{\phi} =...
Table 17

Data from Figure 6(e) in auxiliary material

10.17182/hepdata.86552.v1/t17

The observed limits, expected limits and $\pm 1 \sigma$ and $\pm 2 \sigma$ bands for a model with $m_{\phi} =...
Table 18

Data from Figure 7(a) in auxiliary material

10.17182/hepdata.86552.v1/t18

The observed limits, expected limits and $\pm 1 \sigma$ and $\pm 2 \sigma$ bands for a model with $m_{\phi} =...
Table 19

Data from Figure 7(b) in auxiliary material

10.17182/hepdata.86552.v1/t19

The observed limits, expected limits and $\pm 1 \sigma$ and $\pm 2 \sigma$ bands for a model with $m_{\phi} =...
Table 20

Data from Figure 7(c) in auxiliary material

10.17182/hepdata.86552.v1/t20

The observed limits, expected limits and $\pm 1 \sigma$ and $\pm 2 \sigma$ bands for a model with $m_{\phi} =...
Table 21

Data from Figure 8(a) in auxiliary material

10.17182/hepdata.86552.v1/t21

The observed limits, expected limits and $\pm 1 \sigma$ and $\pm 2 \sigma$ bands for a model with $m_{\phi} =...
Table 22

Data from Figure 8(b) in auxiliary material

10.17182/hepdata.86552.v1/t22

The observed limits, expected limits and $\pm 1 \sigma$ and $\pm 2 \sigma$ bands for a model with $m_{\phi} =...
Table 23

Data from Figure 8(c) in auxiliary material

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The observed limits, expected limits and $\pm 1 \sigma$ and $\pm 2 \sigma$ bands for a model with $m_{\phi} =...
Table 24

Data from Figure 8(d) in auxiliary material

10.17182/hepdata.86552.v1/t24

The observed limits, expected limits and $\pm 1 \sigma$ and $\pm 2 \sigma$ bands for a model with $m_{\phi} =...
Table 25

Data from Figure 8(e) in auxiliary material

10.17182/hepdata.86552.v1/t25

The observed limits, expected limits and $\pm 1 \sigma$ and $\pm 2 \sigma$ bands for a model with $m_{\phi} =...
Table 26

Data from Figure 8(f) in auxiliary material

10.17182/hepdata.86552.v1/t26

The observed limits, expected limits and $\pm 1 \sigma$ and $\pm 2 \sigma$ bands for a model with $m_{\phi} =...
Table 27

Data from Figure 9(a) in auxiliary material

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Combined limits for the CalRatio and MS analyses, for a model with $m_{\phi} = 125 ~\mathrm{GeV}$ and $m_{s} = 5...
Table 28

Data from Figure 9(b) in auxiliary material

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Combined limits for the CalRatio and MS analyses, for a model with $m_{\phi} = 125 ~\mathrm{GeV}$ and $m_{s} = 8...
Table 29

Data from Figure 9(c) in auxiliary material

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Combined limits for the CalRatio and MS analyses, for a model with $m_{\phi} = 125 ~\mathrm{GeV}$ and $m_{s} = 15...
Table 30

Data from Figure 9(d) in auxiliary material

10.17182/hepdata.86552.v1/t30

Combined limits for the CalRatio and MS analyses, for a model with $m_{\phi} = 125 ~\mathrm{GeV}$ and $m_{s} = 40...
Table 31

Data from Figure 10(a) in auxiliary material

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Combined limits for the CalRatio and MS analyses, for a model with $m_{\phi} = 200 ~\mathrm{GeV}$ and $m_{s} = 8...
Table 32

Data from Figure 10(b) in auxiliary material

10.17182/hepdata.86552.v1/t32

Combined limits for the CalRatio and MS analyses, for a model with $m_{\phi} = 200 ~\mathrm{GeV}$ and $m_{s} = 25...
Table 33

Data from Figure 10(c) in auxiliary material

10.17182/hepdata.86552.v1/t33

Combined limits for the CalRatio and MS analyses, for a model with $m_{\phi} = 200 ~\mathrm{GeV}$ and $m_{s} = 50...
Table 34

Data from Figure 11(a) in auxiliary material

10.17182/hepdata.86552.v1/t34

Combined limits for the CalRatio and MS analyses, for a model with $m_{\phi} = 400 ~\mathrm{GeV}$ and $m_{s} = 50...
Table 35

Data from Figure 11(b) in auxiliary material

10.17182/hepdata.86552.v1/t35

Combined limits for the CalRatio and MS analyses, for a model with $m_{\phi} = 400 ~\mathrm{GeV}$ and $m_{s} = 100...
Table 36

Data from Figure 11(c) in auxiliary material

10.17182/hepdata.86552.v1/t36

Combined limits for the CalRatio and MS analyses, for a model with $m_{\phi} = 600 ~\mathrm{GeV}$ and $m_{s} = 50...
Table 37

Data from Figure 12(a) in auxiliary material

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Combined limits for the CalRatio and MS analyses, for a model with $m_{\phi} = 1000 ~\mathrm{GeV}$ and $m_{s} = 50...
Table 38

Data from Figure 12(b) in auxiliary material

10.17182/hepdata.86552.v1/t38

Combined limits for the CalRatio and MS analyses, for a model with $m_{\phi} = 1000 ~\mathrm{GeV}$ and $m_{s} = 150...
Table 39

Data from Figure 12(c) in auxiliary material

10.17182/hepdata.86552.v1/t39

Combined limits for the CalRatio and MS analyses, for a model with $m_{\phi} = 1000 ~\mathrm{GeV}$ and $m_{s} = 400...

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