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

The ATLAS 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

    10.17182/hepdata.69366.v1/t1

    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

    10.17182/hepdata.69366.v1/t2

    Upper limits on the stop pair production cross sections for different values of the branching ratios for the decays $\tilde{t}_1...

  • Table 3

    Data from Figure 5b

    10.17182/hepdata.69366.v1/t3

    Upper limits on the stop pair production cross sections for different values of the branching ratios for the decays $\tilde{t}_1...

  • Table 4

    Data from Figure 6

    10.17182/hepdata.69366.v1/t4

    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

    10.17182/hepdata.69366.v1/t5

    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

    10.17182/hepdata.69366.v1/t8

    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

    10.17182/hepdata.69366.v1/t10

    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

    10.17182/hepdata.69366.v1/t11

    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

    10.17182/hepdata.69366.v1/t12

    Summary of the ATLAS Run 1 searches for direct stop pair production in models where the decay mode $\tilde{t}_1 \rightarrow...

  • Table 13

    Data from Figure 7b

    10.17182/hepdata.69366.v1/t13

    Summary of the ATLAS Run 1 searches for direct stop pair production in models where the decay mode $\tilde{t}_1 \rightarrow...

  • Table 14

    Data from Figure 7c

    10.17182/hepdata.69366.v1/t14

    Summary of the ATLAS Run 1 searches for direct stop pair production in models where the decay mode $\tilde{t}_1 \rightarrow...

  • Table 15

    Data from Figure 7d

    10.17182/hepdata.69366.v1/t15

    Summary of the ATLAS Run 1 searches for direct stop pair production in models where the decay mode $\tilde{t}_1 \rightarrow...

  • Table 16

    Data from Figure 8

    10.17182/hepdata.69366.v1/t16

    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

    10.17182/hepdata.69366.v1/t17

    Exclusion limits at 95% CL in the scenario where $\tilde{t}_2$ pair production is assumed, followed by the decay $\tilde{t}_2 \rightarrow...

  • Table 18

    Data from Figure 9

    10.17182/hepdata.69366.v1/t18

    Exclusion limits at 95% CL in the scenario where $\tilde{t}_2$ pair production is assumed, followed by the decay $\tilde{t}_2 \rightarrow...

  • Table 19

    Data from Figure 10

    10.17182/hepdata.69366.v1/t19

    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

    10.17182/hepdata.69366.v1/t20

    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

    10.17182/hepdata.69366.v1/t21

    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

    10.17182/hepdata.69366.v1/t22

    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

    10.17182/hepdata.69366.v1/t23

    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

    10.17182/hepdata.69366.v1/t24

    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

    10.17182/hepdata.69366.v1/t25

    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

    10.17182/hepdata.69366.v1/t26

    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

    10.17182/hepdata.69366.v1/t27

    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

    10.17182/hepdata.69366.v1/t28

    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

    10.17182/hepdata.69366.v1/t29

    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

    10.17182/hepdata.69366.v1/t30

    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

    10.17182/hepdata.69366.v1/t31

    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

    10.17182/hepdata.69366.v1/t32

    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

    10.17182/hepdata.69366.v1/t33

    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

    10.17182/hepdata.69366.v1/t34

    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

    10.17182/hepdata.69366.v1/t35

    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

    10.17182/hepdata.69366.v1/t36

    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

    10.17182/hepdata.69366.v1/t38

    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

    10.17182/hepdata.69366.v1/t39

    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

    10.17182/hepdata.69366.v1/t40

    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

    10.17182/hepdata.69366.v1/t44

    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

    10.17182/hepdata.69366.v1/t45

    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

    10.17182/hepdata.69366.v1/t47

    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

    10.17182/hepdata.69366.v1/t48

    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

    10.17182/hepdata.69366.v1/t49

    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

    10.17182/hepdata.69366.v1/t50

    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

    10.17182/hepdata.69366.v1/t51

    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

    10.17182/hepdata.69366.v1/t52

    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

    10.17182/hepdata.69366.v1/t53

    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

    10.17182/hepdata.69366.v1/t54

    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

    10.17182/hepdata.69366.v1/t55

    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

    10.17182/hepdata.69366.v1/t56

    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

    10.17182/hepdata.69366.v1/t57

    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

    10.17182/hepdata.69366.v1/t58

    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

    10.17182/hepdata.69366.v1/t59

    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

    10.17182/hepdata.69366.v1/t60

    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

    10.17182/hepdata.69366.v1/t61

    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

    10.17182/hepdata.69366.v1/t62

    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

    10.17182/hepdata.69366.v1/t63

    Combined exclusion limits at 95% CL in the scenario where both stops decay exclusively via $\tilde t_1 \rightarrow t \tilde...

  • Table 64

    Data from Figure 24

    10.17182/hepdata.69366.v1/t64

    Combined exclusion limits at 95% CL in the scenario where both stops decay exclusively via $\tilde t_1 \rightarrow t \tilde...

  • Table 65

    Data from FigureAux 1a

    10.17182/hepdata.69366.v1/t65

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

  • Table 66

    Data from FigureAux 1b

    10.17182/hepdata.69366.v1/t66

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

  • Table 67

    Data from FigureAux 2a

    10.17182/hepdata.69366.v1/t67

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

  • Table 68

    Data from FigureAux 2b

    10.17182/hepdata.69366.v1/t68

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

  • Table 69

    Data from FigureAux 3a

    10.17182/hepdata.69366.v1/t69

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

  • Table 70

    Data from FigureAux 3b

    10.17182/hepdata.69366.v1/t70

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

  • Table 71

    Data from FigureAux 4a

    10.17182/hepdata.69366.v1/t71

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

  • Table 72

    Data from FigureAux 4b

    10.17182/hepdata.69366.v1/t72

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

  • Table 73

    Data from FigureAux 5

    10.17182/hepdata.69366.v1/t73

    Cross section upper limit for the t2t1h analysis.

  • Table 74

    Data from FigureAux 6a

    10.17182/hepdata.69366.v1/t74

    Expected CLs for the t2t1h analysis.

  • Table 75

    Data from FigureAux 6b

    10.17182/hepdata.69366.v1/t75

    Observed CLs for the t2t1h analysis.

  • Table 76

    Data from FigureAux 7a

    10.17182/hepdata.69366.v1/t76

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

  • Table 77

    Data from FigureAux 7b

    10.17182/hepdata.69366.v1/t77

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

  • Table 78

    Data from FigureAux 8a

    10.17182/hepdata.69366.v1/t78

    Efficiency for the SRinA signal region for the pMSSM model.

  • Table 79

    Data from FigureAux 8b

    10.17182/hepdata.69366.v1/t79

    Efficiency for the SRinB signal region for the pMSSM model.

  • Table 80

    Data from FigureAux 8c

    10.17182/hepdata.69366.v1/t80

    Efficiency for the SRinC signal region for the pMSSM model.

  • Table 81

    Data from FigureAux 8d

    10.17182/hepdata.69366.v1/t81

    Efficiency for the SRexA signal region for the pMSSM model.

  • Table 82

    Data from FigureAux 9a

    10.17182/hepdata.69366.v1/t82

    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

    10.17182/hepdata.69366.v1/t83

    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

    10.17182/hepdata.69366.v1/t84

    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

    10.17182/hepdata.69366.v1/t85

    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

    10.17182/hepdata.69366.v1/t86

    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

    10.17182/hepdata.69366.v1/t87

    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

    10.17182/hepdata.69366.v1/t88

    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

    10.17182/hepdata.69366.v1/t89

    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

    10.17182/hepdata.69366.v1/t90

    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

    10.17182/hepdata.69366.v1/t91

    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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