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Search for displaced vertices of oppositely charged leptons from decays of long-lived particles in $pp$ collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector

The collaboration

Abstract (data abstract)
A search for long-lived particles decaying into an oppositely charged lepton pair, $\mu\mu$, $ee$, or $e\mu$, is presented using 32.8 fb$^{-1}$ of $pp$ collision data collected at $\sqrt{s}$ = 13 TeV by the ATLAS detector at the LHC. Candidate leptons are required to form a vertex, within the inner tracking volume of ATLAS, displaced from the primary $pp$ interaction region. No lepton pairs with an invariant mass greater than 12 GeV are observed, consistent with the background expectations derived from data. The result is interpreted in a supersymmetric model in which the lightest neutralino, produced via squark-antisquark production, decays into $\ell^{+}\ell^{'-}\nu$ ($\ell$, $\ell^{'} = e$, $\mu$) with a finite lifetime due to the presence of R-parity violating couplings. Cross-section limits are presented for specific squark and neutralino masses. For a 700 GeV squark, neutralinos with masses of 50-500 GeV and mean proper lifetimes corresponding to $c\tau$ values between 1 mm to 6 m are excluded. For a 1.6 TeV squark, $c\tau$ values between 3 mm to 1 m are excluded for 1.3 TeV neutralinos.

• #### Overview

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<h1>Overview of reinterpretation material</h1><p><b>Important note:</b> A detailed explanation of the reinterpretation material can be found <a href="https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/SUSY-2017-04/hepdata_info.pdf">here</a>.<br/>Please read this stand-alone...

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Data from Figure 1

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dRcos distribution of dimuon pairs (scaled) and dimuon vertices in the cosmic rays control region. The distribution of all dimuon...

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Data from Figure 2a

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Dependence of the overall signal efficiency on the transverse decay radius Rxy of the long-lived Z' for Z' -> ee....

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Data from Figure 2b

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Dependence of the overall signal efficiency on the pT of the long-lived Z' for Z' -> ee. The error bars...

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Data from Figure 2c

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Dependence of the overall signal efficiency on the transverse decay radius Rxy of the long-lived Z' for Z' -> emu....

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Data from Figure 2d

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Dependence of the overall signal efficiency on the pT of the long-lived Z' for Z' -> emu. The error bars...

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Data from Figure 2e

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Dependence of the overall signal efficiency on the transverse decay radius Rxy of the long-lived Z' for Z' -> mumu....

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Data from Figure 2f

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Dependence of the overall signal efficiency on the pT of the long-lived Z' for Z' -> mumu. The error bars...

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Data from Figure 3a

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Overall signal efficiency as a function of the mean proper lifetime (ctau) of the neutralino for the lambda121 scenario of...

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Data from Figure 3b

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Overall signal efficiency as a function of the mean proper lifetime (ctau) of the neutralino for the lambda122 scenario of...

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Data from Figure 4a

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95% CL upper limits on the squark-antisquark production cross-section as a function of the mean proper lifetime (ctau) of the...

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Data from Figure 4b

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95% CL upper limits on the squark-antisquark production cross-section as a function of the mean proper lifetime (ctau) of the...

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Data from Figure 5a

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95% CL upper limits on the squark-antisquark production cross-section as a function of the mean proper lifetime (ctau) of the...

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Data from Figure 5b

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95% CL upper limits on the squark-antisquark production cross-section as a function of the mean proper lifetime (ctau) of the...

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Data from auxiliary Figure 1a

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Fraction of detector volume covered by the material veto as a function of z and Rxy of the displaced dilepton...

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Data from auxiliary Figure 1b

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Fraction of detector volume covered by the disabled pixel modules veto veto as a function of z and Rxy of...

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Data from auxiliary Figure 2

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Observed Rxy distribution of vertices composed of two non-leptonic tracks in a control sample in the data and the predicted...

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Data from auxiliary Figure 3

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Rxy distributions of Kshort vertices from the large radius tracking in the data and background MC samples. Data has been...

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Data from auxiliary Figure 5a

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Acceptance per decay as a function of the mean proper lifetime (ctau) of the neutralino for neutralino -> eenu. The...

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Data from auxiliary Figure 5b

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Acceptance per decay as a function of the mean proper lifetime (ctau) of the neutralino for neutralino -> emunu. The...

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Data from auxiliary Figure 5c

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Acceptance per decay as a function of the mean proper lifetime (ctau) of the neutralino for neutralino -> mumunu. The...

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Data from auxiliary Figure 6a

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Detection efficiency per decay as a function of the mean proper lifetime (ctau) of the neutralino for neutralino -> eenu....

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Data from auxiliary Figure 6b

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Detection efficiency per decay as a function of the mean proper lifetime (ctau) of the neutralino for neutralino -> emunu....

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Data from auxiliary Figure 6c

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Detection efficiency per decay as a function of the mean proper lifetime (ctau) of the neutralino for neutralino -> mumunu....

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Data from auxiliary Figure 7a

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Overall signal efficiency (acceptance times efficiency) per decay as a function of the mean proper lifetime (ctau) of the neutralino...

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Data from auxiliary Figure 7b

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Overall signal efficiency (acceptance times efficiency) per decay as a function of the mean proper lifetime (ctau) of the neutralino...

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Data from auxiliary Figure 7c

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Overall signal efficiency (acceptance times efficiency) per decay as a function of the mean proper lifetime (ctau) of the neutralino...

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Data from auxiliary Figure 8a

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Detection efficiency per decay for Rxy < 22 mm as a function of the invariant mass and pT of the...

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Data from auxiliary Figure 8b

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Detection efficiency per decay for 22 <= Rxy < 38 mm as a function of the invariant mass and pT...

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Data from auxiliary Figure 8c

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Detection efficiency per decay for 38 <= Rxy < 73 mm as a function of the invariant mass and pT...

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Data from auxiliary Figure 8d

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Detection efficiency per decay for 73 <= Rxy < 111 mm as a function of the invariant mass and pT...

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Data from auxiliary Figure 8e

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Detection efficiency per decay for 111 <= Rxy < 145 mm as a function of the invariant mass and pT...

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Data from auxiliary Figure 8f

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Detection efficiency per decay for 145 <= Rxy < 300 mm as a function of the invariant mass and pT...

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Data from auxiliary Figure 9a

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Detection efficiency per decay for Rxy < 22 mm as a function of the invariant mass and pT of the...

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Data from auxiliary Figure 9b

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Detection efficiency per decay for 22 <= Rxy < 38 mm as a function of the invariant mass and pT...

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Data from auxiliary Figure 9c

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Detection efficiency per decay for 38 <= Rxy < 73 mm as a function of the invariant mass and pT...

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Data from auxiliary Figure 9d

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Detection efficiency per decay for 73 <= Rxy < 111 mm as a function of the invariant mass and pT...

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Data from auxiliary Figure 9e

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Detection efficiency per decay for 111 <= Rxy < 145 mm as a function of the invariant mass and pT...

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Data from auxiliary Figure 9f

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Detection efficiency per decay for 145 <= Rxy < 300 mm as a function of the invariant mass and pT...

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Data from auxiliary Figure 10a

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Detection efficiency per decay for Rxy < 22 mm as a function of the invariant mass and pT of the...

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Data from auxiliary Figure 10b

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Detection efficiency per decay for 22 <= Rxy < 38 mm as a function of the invariant mass and pT...

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Data from auxiliary Figure 10c

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Detection efficiency per decay for 38 <= Rxy < 73 mm as a function of the invariant mass and pT...

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Data from auxiliary Figure 10d

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Detection efficiency per decay for 73 <= Rxy < 111 mm as a function of the invariant mass and pT...

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Data from auxiliary Figure 10e

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Detection efficiency per decay for 111 <= Rxy < 145 mm as a function of the invariant mass and pT...

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Data from auxiliary Figure 10f

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Detection efficiency per decay for 145 <= Rxy < 300 mm as a function of the invariant mass and pT...

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Data from auxiliary Figure 11a

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Detection efficiency per decay as a function of the transverse decay radius Rxy and the dilepton pT for a LLP...

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Data from auxiliary Figure 11b

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Detection efficiency per decay as a function of the transverse decay radius Rxy and the dilepton pT for a LLP...

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Data from auxiliary Figure 11c

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Detection efficiency per decay as a function of the transverse decay radius Rxy and the dilepton pT for a LLP...

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Data from auxiliary Figure 12a

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Detection efficiency per decay as a function of the transverse decay radius Rxy and the dilepton pT for a LLP...

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Data from auxiliary Figure 12b

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Detection efficiency per decay as a function of the transverse decay radius Rxy and the dilepton pT for a LLP...

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Data from auxiliary Figure 12c

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Detection efficiency per decay as a function of the transverse decay radius Rxy and the dilepton pT for a LLP...

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Data from auxiliary Figure 13a

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Detection efficiency per decay as a function of the transverse decay radius Rxy and the dilepton pT for a LLP...

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Data from auxiliary Figure 13b

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Detection efficiency per decay as a function of the transverse decay radius Rxy and the dilepton pT for a LLP...

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Data from auxiliary Figure 13c

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Detection efficiency per decay as a function of the transverse decay radius Rxy and the dilepton pT for a LLP...

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Data from auxiliary Figure 14a

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Detection efficiency per decay as a function of the transverse decay radius Rxy and the dilepton pT for a LLP...

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Data from auxiliary Figure 14b

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Detection efficiency per decay as a function of the transverse decay radius Rxy and the dilepton pT for a LLP...

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Data from auxiliary Figure 14c

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Detection efficiency per decay as a function of the transverse decay radius Rxy and the dilepton pT for a LLP...

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Data from auxiliary Figure 15a

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Detection efficiency per decay as a function of the transverse decay radius Rxy and the dilepton pT for a LLP...

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Data from auxiliary Figure 15b

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Detection efficiency per decay as a function of the transverse decay radius Rxy and the dilepton pT for a LLP...

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Data from auxiliary Figure 15c

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Detection efficiency per decay as a function of the transverse decay radius Rxy and the dilepton pT for a LLP...

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Data from auxiliary Table 5

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Acceptance, detection efficiency, and overall signal efficiency in the Z' toy model for mZ' = 100 GeV, three mean proper...

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Data from auxiliary Table 6

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Acceptance, detection efficiency, and overall signal efficiency in the Z' toy model for mZ' = 250 GeV, three mean proper...

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Data from auxiliary Table 7

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Acceptance, detection efficiency, and overall signal efficiency in the Z' toy model for mZ' = 500 GeV, three mean proper...

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Data from auxiliary Table 8

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Acceptance, detection efficiency, and overall signal efficiency in the Z' toy model for mZ' = 750 GeV, three mean proper...

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Data from auxiliary Table 9

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Acceptance, detection efficiency, and overall signal efficiency in the Z' toy model for mZ' = 1000 GeV, three mean proper...