Search for Supersymmetry in final states with missing transverse momentum and multiple $b$-jets in proton--proton collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector

The ATLAS collaboration
No Journal Information, 2017

Abstract
A search for supersymmetry involving the pair production of gluinos decaying via third-generation squarks into the lightest neutralino ($\displaystyle\tilde\chi^0_1$) is reported. It uses LHC proton--proton collision data at a centre-of-mass energy $\sqrt{s} = 13$ TeV with an integrated luminosity of 36.1 fb$^{-1}$ collected with the ATLAS detector in 2015 and 2016. The search is performed in events containing large missing transverse momentum and several energetic jets, at least three of which must be identified as originating from $b$-quarks. To increase the sensitivity, the sample is divided into subsamples based on the presence or absence of electrons or muons. No excess is found above the predicted background. For $\displaystyle\tilde\chi^0_1$ masses below approximately 300 GeV, gluino masses of less than 1.97 (1.92) TeV are excluded at 95% confidence level in simplified models involving the pair production of gluinos that decay via top (bottom) squarks. An interpretation of the limits in terms of the branching ratios of the gluinos into third-generation squarks is also provided. These results improve upon the exclusion limits obtained with the 3.2 fb$^{-1}$ of data collected in 2015.

  • Table 1

    Data from Figure 10a

    10.17182/hepdata.79060.v2/t1

    Observed 95% CL exclusion contour for Gtt model.

  • Table 2

    Data from Figure 10a

    10.17182/hepdata.79060.v2/t2

    Expected 95% CL exclusion contour for Gtt model.

  • Table 3

    Data from Figure 10b

    10.17182/hepdata.79060.v2/t3

    Observed 95% CL exclusion contour for Gbb model.

  • Table 4

    Data from Figure 10b

    10.17182/hepdata.79060.v2/t4

    Expected 95% CL exclusion contour for Gbb model.

  • Table 5

    Data from Figure 11a

    10.17182/hepdata.79060.v2/t5

    Expected 95% CL exclusion contour for Gluino mass = 1.8 TeV, Neutralino mass = 1 GeV.

  • Table 6

    Data from Figure 11a

    10.17182/hepdata.79060.v2/t6

    Observed 95% CL exclusion contour for Gluino mass = 1.8 TeV, Neutralino mass = 1 GeV.

  • Table 7

    Data from Figure 11a

    10.17182/hepdata.79060.v2/t7

    Expected 95% CL exclusion contour for Gluino mass = 1.9 TeV, Neutralino mass = 1 GeV.

  • Table 8

    Data from Figure 11a

    10.17182/hepdata.79060.v2/t8

    Observed 95% CL exclusion contour for Gluino mass = 1.9 TeV, Neutralino mass = 1 GeV.

  • Table 9

    Data from Figure 11a

    10.17182/hepdata.79060.v2/t9

    Expected 95% CL exclusion contour for Gluino mass = 2.0 TeV, Neutralino mass = 1 GeV.

  • Table 10

    Data from Figure 11a

    10.17182/hepdata.79060.v2/t10

    Observed 95% CL exclusion contour for Gluino mass = 2.0 TeV, Neutralino mass = 1 GeV.

  • Table 11

    Data from Figure 11b

    10.17182/hepdata.79060.v2/t11

    Expected 95% CL exclusion contour for Gluino mass = 1.9 TeV, Neutralino mass = 1 GeV.

  • Table 12

    Data from Figure 11b

    10.17182/hepdata.79060.v2/t12

    Observed 95% CL exclusion contour for Gluino mass = 1.9 TeV, Neutralino mass = 1 GeV.

  • Table 13

    Data from Figure 11b

    10.17182/hepdata.79060.v2/t13

    Expected 95% CL exclusion contour for Gluino mass = 1.9 TeV, Neutralino mass = 600 GeV.

  • Table 14

    Data from Figure 11b

    10.17182/hepdata.79060.v2/t14

    Observed 95% CL exclusion contour for Gluino mass = 1.9 TeV, Neutralino mass = 600 GeV.

  • Table 15

    Data from Figure 11b

    10.17182/hepdata.79060.v2/t15

    Expected 95% CL exclusion contour for Gluino mass = 1.9 TeV, Neutralino mass = 1 TeV.

  • Table 16

    Data from Figure 11b

    10.17182/hepdata.79060.v2/t16

    Observed 95% CL exclusion contour for Gluino mass = 1.9 TeV, Neutralino mass = 1 TeV.

  • Table 17

    Data from Figure aux 1a

    10.17182/hepdata.79060.v2/t17

    Distribution of ETMISS for SR-Gbb-VC.

  • Table 18

    Data from Figure aux 1b

    10.17182/hepdata.79060.v2/t18

    Distribution of ETMISS for SR-Gtt-1l-B.

  • Table 19

    Data from Figure aux 1c

    10.17182/hepdata.79060.v2/t19

    Distribution of ETMISS for SR-1L-II.

  • Table 20

    Data from Figure aux 1d

    10.17182/hepdata.79060.v2/t20

    Distribution of ETMISS for SR-0L-HI.

  • Table 21

    Data from Figure aux 1e

    10.17182/hepdata.79060.v2/t21

    Distribution of ETMISS for SR-0L-HH.

  • Table 22

    Data from Figure aux 2a

    10.17182/hepdata.79060.v2/t22

    Acceptances for Gbb model in SR-Gbb-B.

  • Table 23

    Data from Figure aux 2b

    10.17182/hepdata.79060.v2/t23

    Acceptances for Gbb model in SR-Gbb-M.

  • Table 24

    Data from Figure aux 2c

    10.17182/hepdata.79060.v2/t24

    Acceptances for Gbb model in SR-Gbb-C.

  • Table 25

    Data from Figure aux 2d

    10.17182/hepdata.79060.v2/t25

    Acceptances for Gbb model in SR-Gbb-VC.

  • Table 26

    Data from Figure aux 3a

    10.17182/hepdata.79060.v2/t26

    Acceptances for Gtt model in SR-Gtt-0l-B.

  • Table 27

    Data from Figure aux 3b

    10.17182/hepdata.79060.v2/t27

    Acceptances for Gtt model in SR-Gtt-0l-M.

  • Table 28

    Data from Figure aux 3c

    10.17182/hepdata.79060.v2/t28

    Acceptances for Gtt model in SR-Gtt-0l-C.

  • Table 29

    Data from Figure aux 4a

    10.17182/hepdata.79060.v2/t29

    Acceptances for Gtt model in SR-Gtt-1l-B.

  • Table 30

    Data from Figure aux 4b

    10.17182/hepdata.79060.v2/t30

    Acceptances for Gtt model in SR-Gtt-1l-M.

  • Table 31

    Data from Figure aux 4c

    10.17182/hepdata.79060.v2/t31

    Acceptances for Gtt model in SR-Gtt-1l-C.

  • Table 32

    Data from Figure aux 5a

    10.17182/hepdata.79060.v2/t32

    Experimental efficiencies for Gbb model in SR-Gbb-B.

  • Table 33

    Data from Figure aux 5b

    10.17182/hepdata.79060.v2/t33

    Experimental efficiencies for Gbb model in SR-Gbb-M.

  • Table 34

    Data from Figure aux 5c

    10.17182/hepdata.79060.v2/t34

    Experimental efficiencies for Gbb model in SR-Gbb-C.

  • Table 35

    Data from Figure aux 5d

    10.17182/hepdata.79060.v2/t35

    Experimental efficiencies for Gbb model in SR-Gbb-VC.

  • Table 36

    Data from Figure aux 6a

    10.17182/hepdata.79060.v2/t36

    Experimental efficiencies for Gtt model in SR-Gtt-0l-B.

  • Table 37

    Data from Figure aux 6b

    10.17182/hepdata.79060.v2/t37

    Experimental efficiencies for Gtt model in SR-Gtt-0l-M.

  • Table 38

    Data from FIgure aux 6c

    10.17182/hepdata.79060.v2/t38

    Experimental efficiencies for Gtt model in SR-Gtt-0l-C.

  • Table 39

    Data from Figure aux 7a

    10.17182/hepdata.79060.v2/t39

    Experimental efficiencies for Gtt model in SR-Gtt-1l-B.

  • Table 40

    Data from Figure aux 7b

    10.17182/hepdata.79060.v2/t40

    Experimental efficiencies for Gtt model in SR-Gtt-1l-M.

  • Table 41

    Data from Figure aux 7c

    10.17182/hepdata.79060.v2/t41

    Experimental efficiencies for Gtt model in SR-Gtt-0l-C.

  • Table 42

    Data from Figure aux 8a

    10.17182/hepdata.79060.v2/t42

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

  • Table 43

    Data from Figure aux 8b

    10.17182/hepdata.79060.v2/t43

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

  • Table 44

    Data from Figure aux 9a

    10.17182/hepdata.79060.v2/t44

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

  • Table 45

    Data from Figure aux 9b

    10.17182/hepdata.79060.v2/t45

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

  • Table 46

    Data from Figure aux 9c

    10.17182/hepdata.79060.v2/t46

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

  • Table 47

    Data from Figure aux 9d

    10.17182/hepdata.79060.v2/t47

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

  • Table 48

    Data from Figure aux 10a

    10.17182/hepdata.79060.v2/t48

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

  • Table 49

    Data from Figure aux 10b

    10.17182/hepdata.79060.v2/t49

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

  • Table 50

    Data from Figure aux 10c

    10.17182/hepdata.79060.v2/t50

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

  • Table 51

    Data from Figure aux 11a

    10.17182/hepdata.79060.v2/t51

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

  • Table 52

    Data from Figure aux 11b

    10.17182/hepdata.79060.v2/t52

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

  • Table 53

    Data from Figure aux 11c

    10.17182/hepdata.79060.v2/t53

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

  • Table 54

    Data from Figure aux 12a

    10.17182/hepdata.79060.v2/t54

    Observed 95% CL exclusion contour for Gbb model in SR-Gbb-B.

  • Table 55

    Data from Figure aux 12a

    10.17182/hepdata.79060.v2/t55

    Expected 95% CL exclusion contour for Gbb model in SR-Gbb-B.

  • Table 56

    Data from Figure aux 12b

    10.17182/hepdata.79060.v2/t56

    Observed 95% CL exclusion contour for Gbb model in SR-Gbb-M.

  • Table 57

    Data from Figure aux 12b

    10.17182/hepdata.79060.v2/t57

    Expected 95% CL exclusion contour for Gbb model in SR-Gbb-M.

  • Table 58

    Data from Figure aux 12c

    10.17182/hepdata.79060.v2/t58

    Observed 95% CL exclusion contour for Gbb model in SR-Gbb-C.

  • Table 59

    Data from Figure aux 12c

    10.17182/hepdata.79060.v2/t59

    Expected 95% CL exclusion contour for Gbb model in SR-Gbb-C.

  • Table 60

    Data from Figure aux 12d

    10.17182/hepdata.79060.v2/t60

    Observed 95% CL exclusion contour for Gbb model in SR-Gbb-VC.

  • Table 61

    Data from Figure aux 12d

    10.17182/hepdata.79060.v2/t61

    Expected 95% CL exclusion contour for Gbb model in SR-Gbb-VC.

  • Table 62

    Data from Figure aux 13a

    10.17182/hepdata.79060.v2/t62

    Observed 95% CL exclusion contour for Gtt model in SR-Gtt-0l-B.

  • Table 63

    Data from Figure aux 13a

    10.17182/hepdata.79060.v2/t63

    Expected 95% CL exclusion contour for Gtt model in SR-Gtt-0l-B.

  • Table 64

    Data from Figure aux 13b

    10.17182/hepdata.79060.v2/t64

    Observed 95% CL exclusion contour for Gtt model in SR-Gtt-0l-M.

  • Table 65

    Data from Figure aux 13b

    10.17182/hepdata.79060.v2/t65

    Expected 95% CL exclusion contour for Gtt model in SR-Gtt-0l-M.

  • Table 66

    Data from Figure aux 13c

    10.17182/hepdata.79060.v2/t66

    Observed 95% CL exclusion contour for Gtt model in SR-Gtt-0l-C.

  • Table 67

    Data from Figure aux 13c

    10.17182/hepdata.79060.v2/t67

    Expected 95% CL exclusion contour for Gtt model in SR-Gtt-0l-C.

  • Table 68

    Data from Figure aux 14a

    10.17182/hepdata.79060.v2/t68

    Observed 95% CL exclusion contour for Gtt model in SR-Gtt-1l-B.

  • Table 69

    Data from Figure aux 14a

    10.17182/hepdata.79060.v2/t69

    Expected 95% CL exclusion contour for Gtt model in SR-Gtt-1l-B.

  • Table 70

    Data from Figure aux 14b

    10.17182/hepdata.79060.v2/t70

    Observed 95% CL exclusion contour for Gtt model in SR-Gtt-1l-M.

  • Table 71

    Data from Figure aux 14b

    10.17182/hepdata.79060.v2/t71

    Expected 95% CL exclusion contour for Gtt model in SR-Gtt-1l-M.

  • Table 72

    Data from Figure aux 14c

    10.17182/hepdata.79060.v2/t72

    Observed 95% CL exclusion contour for Gtt model in SR-Gtt-1l-C.

  • Table 73

    Data from Figure aux 14c

    10.17182/hepdata.79060.v2/t73

    Expected 95% CL exclusion contour for Gtt model in SR-Gtt-1l-C.

  • Table 74

    Data from Table aux 1

    10.17182/hepdata.79060.v2/t74

    Expected number of signal events after each step of the Gbb-0L-B selection for a Gbb signal point (MGLUON,MNEUTRALINO) = (1900,1400)...

  • Table 75

    Data from Table aux 2

    10.17182/hepdata.79060.v2/t75

    Expected number of signal events after each step of the Gbb-0L-M selection for a Gbb signal point (MGLUON,MNEUTRALINO) = (1900,1400)...

  • Table 76

    Data from Table aux 3

    10.17182/hepdata.79060.v2/t76

    Expected number of signal events after each step of the Gbb-0L-C selection for a Gbb signal point (MGLUON,MNEUTRALINO) = (1900,1400)...

  • Table 77

    Data from Table aux 4

    10.17182/hepdata.79060.v2/t77

    Expected number of signal events after each step of the Gbb-0L-VC selection for a Gbb signal point (MGLUON,MNEUTRALINO) = (1900,1400)...

  • Table 78

    Data from Table aux 5

    10.17182/hepdata.79060.v2/t78

    Expected number of signal events after each step of the Gtt-1L-B selection for a Gtt signal point (MGLUON,MNEUTRALINO) = (1900,1)...

  • Table 79

    Data from Table aux 6

    10.17182/hepdata.79060.v2/t79

    Expected number of signal events after each step of the Gtt-1L-M selection for a Gtt signal point (MGLUON,MNEUTRALINO) = (1900,1)...

  • Table 80

    Data from Table aux 7

    10.17182/hepdata.79060.v2/t80

    Expected number of signal events after each step of the Gtt-1L-C selection for a Gtt signal point (MGLUON,MNEUTRALINO) = (1900,1)...

  • Table 81

    Data from Table aux 8

    10.17182/hepdata.79060.v2/t81

    Expected number of signal events after each step of the Gtt-0L-B selection for a Gtt signal point (MGLUON,MNEUTRALINO) = (1900,1)...

  • Table 82

    Data from Table aux 9

    10.17182/hepdata.79060.v2/t82

    Expected number of signal events after each step of the Gtt-0L-M selection for a Gtt signal point (MGLUON,MNEUTRALINO) = (1900,1)...

  • Table 83

    Data from Table aux 10

    10.17182/hepdata.79060.v2/t83

    Expected number of signal events after each step of the Gtt-0L-C selection for a Gtt signal point (MGLUON,MNEUTRALINO) = (1900,1)...

Version 2 modifications: Some of the other Gbb individual signal region plots (acceptance, experimental efficiency and excluded cross section) had the SR label swapped. This is fixed in the new version.

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