Abstract (data abstract)

Two searches for new phenomena in final states containing a same-flavour opposite-lepton (electron or muon) pair, jets, and large missing transverse momentum are presented. These searches make use of proton--proton collision data, collected during 2015 and 2016 at a centre-of-mass energy $\sqrt{s}=13$ TeV by the ATLAS detector at the Large Hadron Collider, which correspond to an integrated luminosity of 14.7 fb$^{-1}$. Both searches target the pair production of supersymmetric particles, squarks or gluinos, which decay to final states containing a same-flavour opposite-sign lepton pair via one of two mechanisms: a leptonically decaying Z boson in the final state, leading to a peak in the dilepton invariant-mass distribution around the Z boson mass; and decays of neutralinos (e.g. $\tilde{\chi}_2^0 \rightarrow \ell^+\ell^- \tilde{\chi}_1^0$), yielding a kinematic endpoint in the dilepton invariant-mass spectrum. The data are found to be consistent with the Standard Model expectation. Results are interpreted in simplified models of gluino-pair (squark-pair) production, and provide sensitivity to gluinos (squarks) with masses as large as 1.70 TeV (980 GeV).

Table 1

Data from Figure 7a

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Dilepton invariant mass distribution in SRZ.
Table 2

Data from Figure 7b

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Dilepton transverse momentum distribution in SRZ.
Table 3

Data from Figure 7c

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Missing transverse momentum distribution in SRZ.
Table 4

Data from Figure 7d

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HT inclusive distribution in SRZ.
Table 5

Data from Figure 7e

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Jet multiplicity distribution in SRZ.
Table 6

Data from Figure 7f

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B-tagged jet multiplicity distribution in SRZ.
Table 7

Data from Figure 9a

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Dilepton invariant mass distribution in SRMedium.
Table 8

Data from Figure 9b

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Dilepton invariant mass distribution in SRMedium.
Table 9

Data from Figure 9c

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Dilepton invariant mass in SRHigh.
Table 10

Data from Figure 12a

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Expected 95% exclusion contour for the gluino simplified model with fixed N1 mass and decays to quarks and Z bosons...
Table 11

Data from Figure 12a

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Observed 95% exclusion contour for the gluino simplified model with fixed N1 mass and decays to quarks and Z bosons...
Table 12

Data from Figure 12b

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Expected 95% exclusion contour for the squark simplified model with fixed N1 mass and decays to quarks and Z bosons...
Table 13

Data from Figure 12b

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Observed 95% exclusion contour for the squark simplified model with fixed N1 mass and decays to quarks and Z bosons...
Table 14

Data from Figure 13

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Expected 95% exclusion contour for the gluino simplified model with varying N1 mass and decays to quarks and Z bosons...
Table 15

Data from Figure 13

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Observed 95% exclusion contour for the gluino simplified model with varying N1 mass and decays to quarks and Z bosons...
Table 16

Data from Figure 14

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Expected 95% exclusion contour for the gluino simplified model with sleptons in the edge SRs.
Table 17

Data from Figure 14

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Observed 95% exclusion contour for the gluino simplified model with sleptons in the edge SRs.
Table 18

Data from Figure 15

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Expected 95% exclusion contour for the gluino simplified model with decays to on- or off-shell Z bosons in the edge...
Table 19

Data from Figure 15

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Observed 95% exclusion contour for the gluino simplified model with decays to on- or off-shell Z bosons in the edge...
Table 20

Data from Figure 15

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Expected 95% exclusion contour for the gluino simplified model with decays to on- or off-shell Z bosons in SRZ.
Table 21

Data from Figure 15

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Observed 95% exclusion contour for the gluino simplified model with decays to on- or off-shell Z bosons in SRZ.
Table 22

Data from Auxiliary Table 1

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Cutflow table for three benchmark signal points from the $\tilde{g}$--$\chi_{2}^{0}$ on-shell grid in SRZ for the $ee$ and $\mu\mu$ channels...
Table 23

Data from Auxiliary Table 2

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Cutflow table for three benchmark signal points for the slepton model in SR-low, SR-medium and SR-high for the $ee$ and...
Table 24

Data from Auxiliary Figure 1a

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Signal acceptance for the gluino simplified model with decays to quarks and Z bosons in SRZ.
Table 25

Data from Auxiliary Figure 1b

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Signal efficiency for the gluino simplified model with decays to quarks and Z bosons in SRZ.
Table 26

Data from Auxiliary Figure 2a

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Signal acceptance for the gluino simplified model with decays via sleptons in SRLow.
Table 27

Data from Auxiliary Figure 2b

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Signal efficiency for the gluino simplified model with decays via sleptons in SRLow.
Table 28

Data from Auxiliary Figure 2c

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Signal acceptance for the gluino simplified model with decays via sleptons in SRMedium.
Table 29

Data from Auxiliary Figure 2d

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Signal efficiency for the gluino simplified model with decays via sleptons in SRMedium.
Table 30

Data from Auxiliary Figure 2e

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Signal acceptance for the gluino simplified model with decays via sleptons in SRHigh.
Table 31

Data from Auxiliary Figure 2f

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Signal efficiency for the gluino simplified model with decays via sleptons in SRHigh.
Table 32

Data from Auxiliary Figure 3a

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Upper limits on the signal cross-section at 95% CL for the gluino simplified model with fixed N1 mass and decays...
Table 33

Data from Auxiliary Figure 3b

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Upper limits on the signal cross-section at 95% CL for the squark simplified model with fixed N1 mass and decays...
Table 34

Data from Auxiliary Figure 4

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Upper limits on the signal cross-section at 95% CL for the gluino simplified model with varying N1 mass and decays...
Table 35

Data from Auxiliary Figure 5

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Upper limits on the signal cross-section at 95% CL for the gluino simplified model with decays via sleptons.
Table 36

Data from Auxiliary Figure 6

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Upper limits on the signal cross-section at 95% CL for the gluino simplified model with decays to on-shell or off-shell...

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