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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 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.

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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.

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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...

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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...

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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.

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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.

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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.

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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...

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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...

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Data from Figure 8 (top) in paper

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Data from Figure 10 (top) in paper

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Data from Figure 6(a) in auxiliary material

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Data from Figure 6(c) in auxiliary material

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Data from Figure 6(e) in auxiliary material

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Data from Figure 7(b) in auxiliary material

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Data from Figure 8(a) in auxiliary material

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Data from Figure 8(c) in auxiliary material

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Data from Figure 8(e) in auxiliary material

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Data from Figure 9(a) in auxiliary material

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Data from Figure 9(c) in auxiliary material

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Data from Figure 10(a) in auxiliary material

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Data from Figure 10(c) in auxiliary material

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Data from Figure 11(b) in auxiliary material

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Data from Figure 12(a) in auxiliary material

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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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