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Search for pair production of gluinos decaying via stop and sbottom in events with $b$-jets and large missing transverse momentum in $pp$ collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector

The collaboration
Phys.Rev. D94 (2016) 032003, 2016

Abstract (data abstract)
CERN-LHC. A search for Supersymmetry involving the pair production of gluinos decaying via third-generation squarks to the lightest neutralino is reported. It uses an LHC proton--proton dataset at a center-of-mass energy $\sqrt{s} = 13$ TeV with an integrated luminosity of 3.2 fb$^{-1}$ collected with the ATLAS detector in 2015. The signal is searched for in events containing several energetic jets, of which at least three must be identified as $b$-jets, large missing transverse momentum and, potentially, isolated electrons or muons. Large-radius jets with a high mass are also used to identify highly boosted top quarks. No excess is found above the predicted background. For neutralino masses below approximately 700 GeV, gluino masses of less than 1.78 TeV and 1.76 TeV are excluded at the 95% CL in simplified models of the pair production of gluinos decaying via sbottom and stop, respectively. These results significantly extend the exclusion limits obtained with the $\sqrt{s} = 8$ TeV dataset.

• Table 1

Data from Figure 6a

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Distribution of missing transverse energy for SR-Gbb-B.

• Table 2

Data from Figure 6b

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Distribution of missing transverse energy for SR-Gtt-0L-C.

• Table 3

Data from Figure 6c

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Distribution of missing transverse energy for SR-Gtt-1L-A.

• Table 4

Data from Figure 7a

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Expected 95% CL exclusion contour for the Gbb signal.

• Table 5

Data from Figure 7a

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Observed 95% CL exclusion contour for the Gbb signal.

• Table 6

Data from Figure 7b

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Expected 95% CL exclusion contour for the Gtt combination.

• Table 7

Data from Figure 7b

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Observed 95% CL exclusion contour for the Gtt combination.

• Table 8

Data from Figure 8a

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Acceptances for the Gbb model in SR-Gbb-A. Acceptance is evaluated at truth level, with only leptons from heavy bosons and...

• Table 9

Data from Figure 8b

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Acceptances for the Gbb model in SR-Gbb-B. Acceptance is evaluated at truth level, with only leptons from heavy bosons and...

• Table 10

Data from Figure 8c

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Acceptances for the Gbb model in SR-Gbb-C. Acceptance is evaluated at truth level, with only leptons from heavy bosons and...

• Table 11

Data from Figure 9a

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Acceptances for the Gtt model in SR-Gtt-0L-A. Acceptance is evaluated at truth level, with only leptons from heavy bosons and...

• Table 12

Data from Figure 9b

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Acceptances for the Gtt model in SR-Gtt-0L-B. Acceptance is evaluated at truth level, with only leptons from heavy bosons and...

• Table 13

Data from Figure 9c

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Acceptances for the Gtt model in SR-Gtt-0L-C. Acceptance is evaluated at truth level, with only leptons from heavy bosons and...

• Table 14

Data from Figure 10a

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Acceptances for the Gtt model in SR-Gtt-1L-A. Acceptance is evaluated at truth level, with only leptons from heavy bosons and...

• Table 15

Data from Figure 10b

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Acceptances for the Gtt model in SR-Gtt-1L-B. Acceptance is evaluated at truth level, with only leptons from heavy bosons and...

• Table 16

Data from Figure 11a

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Acceptance times efficiency for the Gbb model in SR-Gbb-A.

• Table 17

Data from Figure 11b

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Acceptance times efficiency for the Gbb model in SR-Gbb-B.

• Table 18

Data from Figure 11c

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Acceptance times efficiency for the Gbb model in SR-Gbb-C.

• Table 19

Data from Figure 12a

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Acceptance times efficiency for the Gtt model in SR-Gtt-0L-A.

• Table 20

Data from Figure 12b

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Acceptance times efficiency for the Gtt model in SR-Gtt-0L-B.

• Table 21

Data from Figure 12c

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Acceptance times efficiency for the Gtt model in SR-Gtt-0L-C.

• Table 22

Data from Figure 13a

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Acceptance times efficiency for the Gtt model in SR-Gtt-1L-A.

• Table 23

Data from Figure 13b

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Acceptance times efficiency for the Gtt model in SR-Gtt-1L-B.

• Table 24

Data from Figure 20a

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95% CL upper limit on the cross-section times branching ratio (in fb) for the Gbb model in SR-Gbb-A.

• Table 25

Data from Figure 20b

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95% CL upper limit on the cross-section times branching ratio (in fb) for the Gbb model in SR-Gbb-B.

• Table 26

Data from Figure 20c

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95% CL upper limit on the cross-section times branching ratio (in fb) for the Gbb model in SR-Gbb-C.

• Table 27

Data from Figure 21a

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95% CL upper limit on the cross-section times branching ratio (in fb) for the Gtt model in SR-Gtt-0L-A.

• Table 28

Data from Figure 21b

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95% CL upper limit on the cross-section times branching ratio (in fb) for the Gtt model in SR-Gtt-0L-B.

• Table 29

Data from Figure 21c

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95% CL upper limit on the cross-section times branching ratio (in fb) for the Gtt model in SR-Gtt-0L-C.

• Table 30

Data from Figure 22a

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95% CL upper limit on the cross-section times branching ratio (in fb) for the Gtt model in SR-Gtt-1L-A.

• Table 31

Data from Figure 22b

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95% CL upper limit on the cross-section times branching ratio (in fb) for the Gtt model in SR-Gtt-1L-B.

• Table 32

Data from Figure 23

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Signal region yielding the best expected sensitivity for each point of the parameter space in the Gbb model.

• Table 33

Data from Figure 24a

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Signal region yielding the best expected sensitivity for each point of the parameter space in the Gtt model for the...

• Table 34

Data from Figure 24b

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Signal region yielding the best expected sensitivity for each point of the parameter space in the Gtt model for the...

• Table 35

Data from Figure 25

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Combination of two 0-lepton and 1-lepton signal regions yielding the best expected sensitivity for each point of the parameter space...