Abstract (data abstract)

CERN-LHC. Two searches for supersymmetric particles in final states containing a same-flavour opposite-sign lepton pair, jets and large missing transverse momentum are presented. The proton-proton collision data used in these searches were collected at a centre-of-mass energy $\sqrt{s}=8$ TeV by the ATLAS detector at the Large Hadron Collider and corresponds to an integrated luminosity of 20.3 fb$^{-1}$. Two leptonic production mechanisms are considered: decays of squarks and gluinos with $Z$ bosons in the final state, resulting in a peak in the dilepton invariant mass distribution around the $Z$-boson mass; and decays of neutralinos (e.g. $\tilde{\chi}^{0}_{2} \rightarrow \ell^{+}\ell^{-}\tilde{\chi}^{0}_{1}$), resulting in a kinematic endpoint in the dilepton invariant mass distribution. For the former, an excess of events above the expected Standard Model background is observed, with a significance of 3 standard deviations. In the latter case, the data are well-described by the expected Standard Model background. The results from each channel are interpreted in the context of several supersymmetric models involving the production of squarks and gluinos.

Table 1

Data from Figure 6a

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The observed and expected dielectron invariant mass distribution in SR-Z. The negigible estimated contribution from Z+jets is omitted in these...
Table 2

Data from Figure 6b

10.17182/hepdata.67921.v1/t2

The observed and expected dimuon invariant mass distribution in SR-Z. The negigible estimated contribution from Z+jets is omitted in these...
Table 3

Data from Figure 6c

10.17182/hepdata.67921.v1/t3

The observed and expected $E_T^{miss}$ distribution in the dielectron SR-Z. The negigible estimated contribution from Z+jets is omitted in these...
Table 4

Data from Figure 6d

10.17182/hepdata.67921.v1/t4

The observed and expected $E_T^{miss}$ distribution in the dimuon SR-Z. The negigible estimated contribution from Z+jets is omitted in these...
Table 5

Data from Figure 9a

10.17182/hepdata.67921.v1/t5

The observed and expected dielectron invariant mass distribution in SR-loose. The last bin contains the overflow.
Table 6

Data from Figure 9b

10.17182/hepdata.67921.v1/t6

The observed and expected dimuon invariant mass distribution in SR-loose. The last bin contains the overflow.
Table 7

Data from Figure 9c

10.17182/hepdata.67921.v1/t7

The observed and expected dielectron invariant mass distribution in the two-jet $b$-veto SR. The last bin contains the overflow.
Table 8

Data from Figure 9d

10.17182/hepdata.67921.v1/t8

The observed and expected dimuon invariant mass distribution in the two-jet $b$-veto SR. The last bin contains the overflow.
Table 9

Data from Figure 9e

10.17182/hepdata.67921.v1/t9

The observed and expected dielectron invariant mass distribution in the four jet b-veto SR. The last bin contains the overflow.
Table 10

Data from Figure 9f

10.17182/hepdata.67921.v1/t10

The observed and expected dimuon invariant mass distribution in the four-jet $b$-veto SR. The last bin contains the overflow.
Table 11

Data from Figure 10a

10.17182/hepdata.67921.v1/t11

The observed and expected dielectron invariant mass distribution in the two-jet $b$-tag SR. The last bin contains the overflow.
Table 12

Data from Figure 10b

10.17182/hepdata.67921.v1/t12

The observed and expected dimuon invariant mass distribution in two-jet $b$-tag SR. The last bin contains the overflow.
Table 13

Data from Figure 10c

10.17182/hepdata.67921.v1/t13

The observed and expected dielectron invariant mass distribution in the four-jet $b$-tag SR. The last bin contains the overflow.
Table 14

Data from Figure 10d

10.17182/hepdata.67921.v1/t14

The observed and expected dimuon invariant mass distribution in the four-jet $b$-tag SR. The last bin contains the overflow.
Table 15

Data from Figure 12a

10.17182/hepdata.67921.v1/t15

Expected 95% exclusion contour for the GGM model with $\tan(\beta)=1.5$ in SR-Z.
Table 16

Data from Figure 12a

10.17182/hepdata.67921.v1/t16

Observed 95% exclusion contour for the GGM model with $\tan(\beta)=1.5$ in SR-Z.
Table 17

Data from Figure 12b

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Expected 95% exclusion contour for the GGM model with $\tan(\beta)=30$ in SR-Z.
Table 18

Data from Figure 12b

10.17182/hepdata.67921.v1/t18

Observed 95% exclusion contour for the GGM model with $\tan(\beta)=30$ in SR-Z.
Table 19

Data from Figure 13a

10.17182/hepdata.67921.v1/t19

Expected 95% exclusion contour for the two-step first- and second-generation squark simplified model with sleptons in the two-jet $b$-veto SR.
Table 20

Data from Figure 13a

10.17182/hepdata.67921.v1/t20

Observed 95% exclusion contour for the two-step first- and second-generation squark simplified model with sleptons in the two-jet $b$-veto SR.
Table 21

Data from Figure 13b

10.17182/hepdata.67921.v1/t21

Expected 95% exclusion contour for the two-step gluino simplified model with sleptons in the four-jet $b$-veto SR.
Table 22

Data from Figure 13b

10.17182/hepdata.67921.v1/t22

Observed 95% exclusion contour for the two-step gluino simplified model with sleptons in the four-jet $b$-veto SR.
Table 23

Data from Auxiliary Figure 1a

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Number of generated events in the two-step gluino simplified model with sleptons.
Table 24

Data from Auxiliary Figure 1b

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Production cross-section in the two-step gluino simplified model with sleptons.
Table 25

Data from Auxiliary Figure 2a

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Number of generated events in the two-step first- and second-generation squark simplified model with sleptons.
Table 26

Data from Auxiliary Figure 2b

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Production cross-section in the two-step first- and second-generation squark simplified model with sleptons.
Table 27

Data from Auxiliary Figure 3a

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Number of generated events in the GGM model with $\tan(\beta)=1.5$.
Table 28

Data from Auxiliary Figure 3b

10.17182/hepdata.67921.v1/t28

Production cross-section in the GGM model with $\tan(\beta)=1.5$.
Table 29

Data from Auxiliary Figure 4a

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Number of generated events in the GGM model with $\tan(\beta)=30$.
Table 30

Data from Auxiliary Figure 4b

10.17182/hepdata.67921.v1/t30

Production cross-section in the GGM model with $\tan(\beta)=30$.
Table 31

Data from Auxiliary Figure 5

10.17182/hepdata.67921.v1/t31

Total experimental uncertainty [%] for the two-step gluino simplified model with sleptons.
Table 32

Data from Auxiliary Figure 6a

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Total experimental uncertainty [%] for the GGM model with $\tan(\beta)=1.5$.
Table 33

Data from Auxiliary Figure 6b

10.17182/hepdata.67921.v1/t33

Total experimental uncertainty for the GGM model with $\tan(\beta)=30$.
Table 34

Data from Auxiliary Figure 9a

10.17182/hepdata.67921.v1/t34

Signal acceptance for the GGM model with $\tan(\beta)=1.5$ in the combined electron and muon SR-Z.
Table 35

Data from Auxiliary Figure 9b

10.17182/hepdata.67921.v1/t35

Signal acceptance for the GGM model with $\tan(\beta)=30$ in the combined electron and muon SR-Z.
Table 36

Data from Auxiliary Figure 10a

10.17182/hepdata.67921.v1/t36

Signal efficiency for the GGM model with $\tan(\beta)=1.5$ in the dielectron SR-Z.
Table 37

Data from Auxiliary Figure 10b

10.17182/hepdata.67921.v1/t37

Signal efficiency for the GGM model with $\tan(\beta)=30$ in the dielectron SR-Z.
Table 38

Data from Auxiliary Figure 11a

10.17182/hepdata.67921.v1/t38

Signal efficiency for the GGM model with $\tan(\beta)=1.5$ in the dimuon SR-Z.
Table 39

Data from Auxiliary Figure 11b

10.17182/hepdata.67921.v1/t39

Signal efficiency for the GGM model with $\tan(\beta)=30$ in the dimuon SR-Z.
Table 40

Data from Auxiliary Figure 12a

10.17182/hepdata.67921.v1/t40

Signal efficiency for the GGM model with $\tan(\beta)=1.5$ in the electron and muon combined SR-Z.
Table 41

Data from Auxiliary Figure 12b

10.17182/hepdata.67921.v1/t41

Signal efficiency for the GGM model with $\tan(\beta)=30$ in the the electron and muon combined SR-Z.
Table 42

Data from Auxiliary Figure 13a

10.17182/hepdata.67921.v1/t42

Signal acceptance for the two-step first- and second-generation squarks simplified model with sleptons in the two-jet $b$-veto SR.
Table 43

Data from Auxiliary Figure 13b

10.17182/hepdata.67921.v1/t43

Signal acceptance for the two-step gluino simplified model with sleptons in the four-jet $b$-veto SR.
Table 44

Data from Auxiliary Figure 14a

10.17182/hepdata.67921.v1/t44

Signal efficiency for the two-step first- and second-generation squarks simplified model with sleptons in the two-jet $b$-veto SR.
Table 45

Data from Auxiliary Figure 14b

10.17182/hepdata.67921.v1/t45

Signal efficiency for the two-step gluino simplified model with sleptons in the four-jet $b$-veto SR.
Table 46

Data from Auxiliary Figure 15a

10.17182/hepdata.67921.v1/t46

Upper limits on the signal cross-section at 95% CL for the GGM model with $\tan(\beta)=1.5$.
Table 47

Data from Auxiliary Figure 16a

10.17182/hepdata.67921.v1/t47

Observed CL$_{\text{S}}$ for the GGM model with $\tan(\beta)=1.5$.
Table 48

Data from Auxiliary Figure 16b

10.17182/hepdata.67921.v1/t48

Expected CL$_{\text{S}}$ for the GGM model with $\tan(\beta)=1.5$.
Table 49

Data from Auxiliary Figure 15b

10.17182/hepdata.67921.v1/t49

Upper limits on the signal cross-section at 95% CL for the GGM model with $\tan(\beta)=30$.
Table 50

Data from Auxiliary Figure 17a

10.17182/hepdata.67921.v1/t50

Observed CL$_{\text{S}}$ for the GGM model with $\tan(\beta)=30$.
Table 51

Data from Auxiliary Figure 17b

10.17182/hepdata.67921.v1/t51

Expected CL$_{\text{S}}$ for the GGM model with $\tan(\beta)=30$.
Table 52

Data from Auxiliary Figure 18a

10.17182/hepdata.67921.v1/t52

Upper limits on the signal stength at 95% CL for the two-step first- and second-generation squark simplified model with sleptons....
Table 53

Data from Auxiliary Figure 18b

10.17182/hepdata.67921.v1/t53

Upper limits on the signal stength at 95% CL for the two-step gluino simplified model with sleptons. The excluded signal...
Table 54

Data from Auxiliary Figure 19a

10.17182/hepdata.67921.v1/t54

Observed CL$_{\text{S}}$ for the two-step first- and second-generation squark simplified model with sleptons.
Table 55

Data from Auxiliary Figure 19b

10.17182/hepdata.67921.v1/t55

Expected CL$_{\text{S}}$ for the two-step first- and second-generation squark simplified model with sleptons.
Table 56

Data from Auxiliary Figure 20a

10.17182/hepdata.67921.v1/t56

Observed CL$_{\text{S}}$ for the two-step gluino simplified model with sleptons.
Table 57

Data from Auxiliary Figure 20b

10.17182/hepdata.67921.v1/t57

Expected CL$_{\text{S}}$ for the two-step gluino simplified model with sleptons.
Table 58

Data from Auxiliary Table 1

10.17182/hepdata.67921.v1/t58

Cutflow table for three benchmark signal points in SR-Z for the $ee$ and $\mu\mu$ channels separately. The three signal points...
Table 59

Data from Auxiliary Table 2

10.17182/hepdata.67921.v1/t59

Cutflow table for three benchmark signal points in the two jet b-veto SR of the off-$Z$ search for the $ee$...
Table 60

Data from Auxiliary Table 3

10.17182/hepdata.67921.v1/t60

Cutflow table for three benchmark signal points in the four jet b-veto SR of the off-$Z$ search for the $ee$...

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