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ATLAS Run 1 searches for direct pair production of third-generation squarks at the Large Hadron Collider

The collaboration
Eur.Phys.J. C75 (2015) 510, 2015

Abstract (data abstract)
CERN-LHC. This paper reviews and extends searches for the direct pair production of the scalar supersymmetric partners of the top and bottom quarks in proton--proton collisions collected by the ATLAS collaboration during the LHC Run 1. Most of the analyses use 20 fb$^{-1}$ of collisions at a centre-of-mass energy of $\sqrt{s} = 8$ TeV, although in some case an additional 4.7 fb$^{-1}$ of collision data at $\sqrt{s}= 7$ TeV are used. New analyses are introduced to improve the sensitivity to specific regions of the model parameter space. Since no evidence of third-generation squarks is found, exclusion limits are derived by combining several analyses and are presented in both a simplified model framework, assuming simple decay chains, as well as within the context of more elaborate phenomenological supersymmetric models.

• Table 1

Data from Figure 4

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Summary of the ATLAS Run 1 searches for direct stop pair production in models where no supersymmetric particle other than...

• Table 2

Data from Figure 5a

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• Table 4

Data from Figure 6

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Combined exclusion limits assuming that the stop decays through $\tilde{t}_1 \rightarrow t + \tilde{\chi}_1^0$ with branching ratio x and...

• Table 5

Data from Figure 6

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Combined exclusion limits assuming that the stop decays through $\tilde{t}_1 \rightarrow t + \tilde{\chi}_1^0$ with branching ratio x and...

• Table 6

Data from Figure 6

10.17182/hepdata.69366.v1/t6

Combined exclusion limits assuming that the stop decays through $\tilde{t}_1 \rightarrow t + \tilde{\chi}_1^0$ with branching ratio x and...

• Table 7

Data from Figure 6

10.17182/hepdata.69366.v1/t7

Combined exclusion limits assuming that the stop decays through $\tilde{t}_1 \rightarrow t + \tilde{\chi}_1^0$ with branching ratio x and...

• Table 8

Data from Figure 6

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Combined exclusion limits assuming that the stop decays through $\tilde{t}_1 \rightarrow t + \tilde{\chi}_1^0$ with branching ratio x and...

• Table 9

Data from Figure 6

10.17182/hepdata.69366.v1/t9

Combined exclusion limits assuming that the stop decays through $\tilde{t}_1 \rightarrow t + \tilde{\chi}_1^0$ with branching ratio x and...

• Table 10

Data from Figure 6

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Combined exclusion limits assuming that the stop decays through $\tilde{t}_1 \rightarrow t + \tilde{\chi}_1^0$ with branching ratio x and...

• Table 11

Data from Figure 6

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Combined exclusion limits assuming that the stop decays through $\tilde{t}_1 \rightarrow t + \tilde{\chi}_1^0$ with branching ratio x and...

• Table 12

Data from Figure 7a

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• Table 14

Data from Figure 7c

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• Table 16

Data from Figure 8

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Exclusion limits assuming that the stop decays through $\tilde{t}_1 \rightarrow b + \tilde{\chi}_1^\pm + W^{(*)} + \tilde{\chi}_1^0$ with branching ratio...

• Table 17

Data from Figure 9

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• Table 19

Data from Figure 10

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Exclusion limits as a function of the stop2 branching ratio for decays into Z, Higgs and neutralino. m(t2)=350 GeV and...

• Table 20

Data from Figure 10

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Exclusion limits as a function of the stop2 branching ratio for decays into Z, Higgs and neutralino. m(t2)=350 GeV and...

• Table 21

Data from Figure 10

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Exclusion limits as a function of the stop2 branching ratio for decays into Z, Higgs and neutralino. m(t2)=350 GeV and...

• Table 22

Data from Figure 10

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Exclusion limits as a function of the stop2 branching ratio for decays into Z, Higgs and neutralino. m(t2)=350 GeV and...

• Table 23

Data from Figure 10

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Exclusion limits as a function of the stop2 branching ratio for decays into Z, Higgs and neutralino. m(t2)=500 GeV and...

• Table 24

Data from Figure 10

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Exclusion limits as a function of the stop2 branching ratio for decays into Z, Higgs and neutralino. m(t2)=500 GeV and...

• Table 25

Data from Figure 10

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Exclusion limits as a function of the stop2 branching ratio for decays into Z, Higgs and neutralino. m(t2)=500 GeV and...

• Table 26

Data from Figure 10

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Exclusion limits as a function of the stop2 branching ratio for decays into Z, Higgs and neutralino. m(t2)=500 GeV and...

• Table 27

Data from Figure 10

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Exclusion limits as a function of the stop2 branching ratio for decays into Z, Higgs and neutralino. m(t2)=500 GeV and...

• Table 28

Data from Figure 10

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Exclusion limits as a function of the stop2 branching ratio for decays into Z, Higgs and neutralino. m(t2)=500 GeV and...

• Table 29

Data from Figure 10

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Exclusion limits as a function of the stop2 branching ratio for decays into Z, Higgs and neutralino. m(t2)=500 GeV and...

• Table 30

Data from Figure 10

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Exclusion limits as a function of the stop2 branching ratio for decays into Z, Higgs and neutralino. m(t2)=500 GeV and...

• Table 31

Data from Figure 11

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Observed and expected 95% CL limits on sbottom pair production where the sbottom is assumed to decay as b1->b chi10...

• Table 32

Data from Figure 12a

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Exclusion limits at 95% CL for a scenario where sbottoms are pair produced and decay as b1 -> t chi1+...

• Table 33

Data from Figure 12b

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Exclusion limits at 95% CL for a scenario where sbottoms are pair produced and decay as b1 -> b chi2...

• Table 34

Data from Figure 13

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Observed 95% CL exclusion limits for the naturalness-inspired set of pMSSM models from the combination t0L, t1L and tb analyses...

• Table 35

Data from Figure 13

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Expected 95% CL exclusion limits for the naturalness-inspired set of pMSSM models from the combination t0L, t1L and tb analyses...

• Table 36

Data from Figure 14a

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Observed 95% CL exclusion limits for the pMSSM model with well-tempered neutralinos as a function of M1 and mqL3. The...

• Table 37

Data from Figure 14a

10.17182/hepdata.69366.v1/t37

Expected 95% CL exclusion limits for the pMSSM model with well-tempered neutralinos as a function of M1 and mqL3. The...

• Table 38

Data from Figure 14b

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Observed 95% CL exclusion limits for the pMSSM model with well-tempered neutralinos as a function of M1 and mtR. The...

• Table 39

Data from Figure 14b

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Expected 95% CL exclusion limits for the pMSSM model with well-tempered neutralinos as a function of M1 and mtR. The...

• Table 40

Data from Figure 15a

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Observed 95% CL exclusion limits for the set of h/Z-enriched pMSSM models as a function of $\mu$ and m(qL3). The...

• Table 41

Data from Figure 15a

10.17182/hepdata.69366.v1/t41

Expected 95% CL exclusion limits for the set of h/Z-enriched pMSSM models as a function of $\mu$ and m(qL3). The...

• Table 42

Data from Figure 15b

10.17182/hepdata.69366.v1/t42

Observed 95% CL exclusion limits for the set of h/Z-enriched pMSSM models as a function of $\mu$ and m(bR). The...

• Table 43

Data from Figure 15b

10.17182/hepdata.69366.v1/t43

Expected 95% CL exclusion limits for the set of h/Z-enriched pMSSM models as a function of $\mu$ and m(bR). The...

• Table 44

Data from Figure 16

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Expected and observed 95% CL limits on the signal strength mu (defined as the ratio of the obtained stop cross...

• Table 45

Data from Figure 19a

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Exclusion limits at 95% CL in the scenario where both pair-produced stop decay exclusively via $\tilde{t}_1 \rightarrow b \chi^\pm_1$ followed...

• Table 46

Data from Figure 19a

10.17182/hepdata.69366.v1/t46

Exclusion limits at 95% CL in the scenario where both pair-produced stop decay exclusively via $\tilde{t}_1 \rightarrow b \chi^\pm_1$ followed...

• Table 47

Data from Figure 19b

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Exclusion limits at 95% CL in the scenario where both pair-produced stop decay exclusively via three-body or four-body decay (depending...

• Table 48

Data from Figure 19b

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Exclusion limits at 95% CL in the scenario where both pair-produced stop decay exclusively via three-body or four-body decay (depending...

• Table 49

Data from Figure 22a

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Observed exclusion limits at 95% CL from the tb signal regions for simplified models with stop decays into both stop1->t...

• Table 50

Data from Figure 22a

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Expected exclusion limits at 95% CL from the tb signal regions for simplified models with stop decays into both stop1->t...

• Table 51

Data from Figure 22b

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Observed exclusion limits at 95% CL from the tb signal regions for simplified models with stop decays into both stop1->t...

• Table 52

Data from Figure 22b

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Expected exclusion limits at 95% CL from the tb signal regions for simplified models with stop decays into both stop1->t...

• Table 53

Data from Figure 22c

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Observed exclusion limits at 95% CL from the tb signal regions for simplified models with stop decays into both stop1->t...

• Table 54

Data from Figure 22c

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Expected exclusion limits at 95% CL from the tb signal regions for simplified models with stop decays into both stop1->t...

• Table 55

Data from Figure 22d

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Observed exclusion limits at 95% CL from the tb signal regions for simplified models with stop decays into both stop1->t...

• Table 56

Data from Figure 22d

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Expected exclusion limits at 95% CL from the tb signal regions for simplified models with stop decays into both stop1->t...

• Table 57

Data from Figure 22e

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Observed exclusion limits at 95% CL from the tb signal regions for simplified models with stop decays into both stop1->t...

• Table 58

Data from Figure 22e

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Expected exclusion limits at 95% CL from the tb signal regions for simplified models with stop decays into both stop1->t...

• Table 59

Data from Figure 22f

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Observed exclusion limits at 95% CL from the tb signal regions for simplified models with stop decays into both stop1->t...

• Table 60

Data from Figure 22f

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Expected exclusion limits at 95% CL from the tb signal regions for simplified models with stop decays into both stop1->t...

• Table 61

Data from Figure 23

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Observed exclusion limits at 95% CL from the tb signal regions in the natural pMSSM model. This table is for...

• Table 62

Data from Figure 23

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Expected exclusion limits at 95% CL from the tb signal regions in the natural pMSSM model. This table is for...

• Table 63

Data from Figure 24

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• Table 65

Data from FigureAux 1a

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Best expected SR for the WW analysis and the three- and four-body decays.

• Table 66

Data from FigureAux 1b

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Cross-section upper limit for the WW analysis and the three- and four-body decays.

• Table 67

Data from FigureAux 2a

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Expected CLs for the WW analysis and the 3- and 4-body decays.

• Table 68

Data from FigureAux 2b

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Observed CLs for the WW analysis and the 3- and 4-body decays.

• Table 69

Data from FigureAux 3a

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Best expected SR for the WW analysis and the stop1->chargino1 decay.

• Table 70

Data from FigureAux 3b

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Cross section upper limit for the WW analysis and the stop1->chargino1 decay.

• Table 71

Data from FigureAux 4a

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Expected CLs for the WW analysis and the stop1->chargino1 decay.

• Table 72

Data from FigureAux 4b

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Observed CLs for the WW analysis and the stop1->chargino1 decay.

• Table 73

Data from FigureAux 5

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Cross section upper limit for the t2t1h analysis.

• Table 74

Data from FigureAux 6a

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Expected CLs for the t2t1h analysis.

• Table 75

Data from FigureAux 6b

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Observed CLs for the t2t1h analysis.

• Table 76

Data from FigureAux 7a

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Best expected SR for the tb analysis in the pMSSM model.

• Table 77

Data from FigureAux 7b

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Cross section upper limit for the tb analysis in the pMSSM model.

• Table 78

Data from FigureAux 8a

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Efficiency for the SRinA signal region for the pMSSM model.

• Table 79

Data from FigureAux 8b

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Efficiency for the SRinB signal region for the pMSSM model.

• Table 80

Data from FigureAux 8c

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Efficiency for the SRinC signal region for the pMSSM model.

• Table 81

Data from FigureAux 8d

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Efficiency for the SRexA signal region for the pMSSM model.

• Table 82

Data from FigureAux 9a

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Best expected SR for the tb analysis in the simplified model with Delta(m) = 5 GeV and BR=50%.

• Table 83

Data from FigureAux 9b

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Cross section upper limit for the tb analysis in the simplified model with Delta(m) = 5 GeV and BR=50%.

• Table 84

Data from FigureAux 10a

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Best expected SR for the tb analysis in the simplified model with Delta(m) = 20 GeV and BR=50%.

• Table 85

Data from FigureAux 10b

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Cross section upper limit for the tb analysis in the simplified model with Delta(m) = 20 GeV and BR=50%.

• Table 86

Data from FigureAux 11a

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Best expected SR and cross section upper limit for the tb analysis in the simplified model with Delta(m) = 5...

• Table 87

Data from FigureAux 11b

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Best expected SR and cross section upper limit for the tb analysis in the simplified model with Delta(m) = 20...

• Table 88

Data from FigureAux 11c

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Best expected SR and cross section upper limit for the tb analysis in the simplified model with Delta(m) = 5...

• Table 89

Data from FigureAux 11d

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Best expected SR and cross section upper limit for the tb analysis in the simplified model with Delta(m) = 20...

• Table 90

Data from FigureAux 12

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Exclusion limits for the naturalness-inspired set of pMSSM models from the combination t0L, t1L and tb analyses using the signal...

• Table 91

Data from FigureAux 13a

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95% CL exclusion limits for the pMSSM model with well-tempered neutralinos as a function of M1 and mqL3. The limit...

• Table 92

Data from FigureAux 13b

10.17182/hepdata.69366.v1/t92

Expected 95% CL exclusion limits for the pMSSM model with well-tempered neutralinos as a function of M1 and mtR. The...

• Table 93

Data from FigureAux 14a

10.17182/hepdata.69366.v1/t93

95% CL exclusion limits for the set of h/Z-enriched pMSSM models as a function of $\mu$ and m(qL3). The limit...

• Table 94

Data from FigureAux 14b

10.17182/hepdata.69366.v1/t94

95% CL exclusion limits for the set of h/Z-enriched pMSSM models as a function of $\mu$ and m(bR). The limit...

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