Search for long-lived neutral particles in $pp$ collisions at $\sqrt{s}$ = 13 TeV that decay into displaced hadronic jets in the ATLAS calorimeter

The ATLAS collaboration
Eur.Phys.J. C79 (2019) 481, 2019

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

    10.17182/hepdata.86552.v1/t8

    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

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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 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

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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 16

    Data from Figure 6(d) 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 17

    Data from Figure 6(e) 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 18

    Data from Figure 7(a) 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 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

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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 23

    Data from Figure 8(c) in auxiliary material

    10.17182/hepdata.86552.v1/t23

    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

    10.17182/hepdata.86552.v1/t27

    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

    10.17182/hepdata.86552.v1/t28

    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

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    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

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    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

    10.17182/hepdata.86552.v1/t37

    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

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    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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