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Search for B-L R -parity-violating top squarks in $\sqrt s$ =13 TeV pp collisions with the ATLAS experiment

The collaboration
Phys.Rev.D 97 (2018) 032003, 2018.

Abstract
A search is presented for the direct pair production of the stop, the supersymmetric partner of the top quark, that decays through an $R$-parity-violating coupling to a final state with two leptons and two jets, at least one of which is identified as a $b$-jet. The dataset corresponds to an integrated luminosity of 36.1 fb$^{-1}$ of proton-proton collisions at a center-of-mass energy of $\sqrt{s} = 13$ TeV, collected in 2015 and 2016 by the ATLAS detector at the LHC. No significant excess is observed over the Standard Model background, and exclusion limits are set on stop pair production at a 95% confidence level. Lower limits on the stop mass are set between 600 GeV and 1.5 TeV for branching ratios above 10% for decays to an electron or muon and a $b$-quark.

• #### Expected Contour 1

Data from Figure 6, Auxiliary Figure 2a

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Expected exclusion limit contour in the (BRe,BRtau) plane for a 600 GeV stop. All limits are computed at 95% CL.

• #### Observed Contour 1

Data from Figure 6, Auxiliary Figure 2a

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Observed exclusion limit contour in the (BRe,BRtau) plane for a 600 GeV stop. All limits are computed at 95% CL.

• #### Expected Contour 2

Data from Auxiliary Figure 3a

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Expected exclusion limit contour in the (BRe,BRtau) plane for a 700 GeV stop. All limits are computed at 95% CL.

• #### Observed Contour 2

Data from Auxiliary Figure 3a

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Observed exclusion limit contour in the (BRe,BRtau) plane for a 700 GeV stop. All limits are computed at 95% CL.

• #### Expected Contour 3

Data from Auxiliary Figure 4a

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Expected exclusion limit contour in the (BRe,BRtau) plane for a 800 GeV stop. All limits are computed at 95% CL.

• #### Observed Contour 3

Data from Auxiliary Figure 4a

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Observed exclusion limit contour in the (BRe,BRtau) plane for a 800 GeV stop. All limits are computed at 95% CL.

• #### Expected Contour 4

Data from Figure 6, Auxiliary Figure 5a

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Expected exclusion limit contour in the (BRe,BRtau) plane for a 900 GeV stop. All limits are computed at 95% CL.

• #### Observed Contour 4

Data from Figure 6, Auxiliary Figure 5a

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Observed exclusion limit contour in the (BRe,BRtau) plane for a 900 GeV stop. All limits are computed at 95% CL.

• #### Expected Contour 5

Data from Figure 6, Auxiliary Figure 6a

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Expected exclusion limit contour in the (BRe,BRtau) plane for a 1000 GeV stop. All limits are computed at 95% CL.

• #### Observed Contour 5

Data from Figure 6, Auxiliary Figure 6a

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Observed exclusion limit contour in the (BRe,BRtau) plane for a 1000 GeV stop. All limits are computed at 95% CL.

• #### Expected Contour 6

Data from Auxiliary Figure 7a

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Expected exclusion limit contour in the (BRe,BRtau) plane for a 1050 GeV stop. All limits are computed at 95% CL.

• #### Observed Contour 6

Data from Auxiliary Figure 7a

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Observed exclusion limit contour in the (BRe,BRtau) plane for a 1050 GeV stop. All limits are computed at 95% CL.

• #### Expected Contour 7

Data from Figure 6, Auxiliary Figure 8a

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Expected exclusion limit contour in the (BRe,BRtau) plane for a 1100 GeV stop. All limits are computed at 95% CL.

• #### Observed Contour 7

Data from Figure 6, Auxiliary Figure 8a

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Observed exclusion limit contour in the (BRe,BRtau) plane for a 1100 GeV stop. All limits are computed at 95% CL.

• #### Expected Contour 8

Data from Auxiliary Figure 9a

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Expected exclusion limit contour in the (BRe,BRtau) plane for a 1150 GeV stop. All limits are computed at 95% CL.

• #### Observed Contour 8

Data from Auxiliary Figure 9a

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Observed exclusion limit contour in the (BRe,BRtau) plane for a 1150 GeV stop. All limits are computed at 95% CL.

• #### Expected Contour 9

Data from Figure 6, Auxiliary Figure 10a

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Expected exclusion limit contour in the (BRe,BRtau) plane for a 1200 GeV stop. All limits are computed at 95% CL.

• #### Observed Contour 9

Data from Figure 6, Auxiliary Figure 10a

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Observed exclusion limit contour in the (BRe,BRtau) plane for a 1200 GeV stop. All limits are computed at 95% CL.

• #### Expected Contour 10

Data from Auxiliary Figure 11a

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Expected exclusion limit contour in the (BRe,BRtau) plane for a 1250 GeV stop. All limits are computed at 95% CL.

• #### Observed Contour 10

Data from Auxiliary Figure 11a

10.17182/hepdata.78376.v3/t20

Observed exclusion limit contour in the (BRe,BRtau) plane for a 1250 GeV stop. All limits are computed at 95% CL.

• #### Expected Contour 11

Data from Figure 6, Auxiliary Figure 12a

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Expected exclusion limit contour in the (BRe,BRtau) plane for a 1300 GeV stop. All limits are computed at 95% CL.

• #### Observed Contour 11

Data from Figure 6, Auxiliary Figure 12a

10.17182/hepdata.78376.v3/t22

Observed exclusion limit contour in the (BRe,BRtau) plane for a 1300 GeV stop. All limits are computed at 95% CL.

• #### Expected Contour 12

Data from Auxiliary Figure 13a

10.17182/hepdata.78376.v3/t23

Expected exclusion limit contour in the (BRe,BRtau) plane for a 1350 GeV stop. All limits are computed at 95% CL.

• #### Observed Contour 12

Data from Auxiliary Figure 13a

10.17182/hepdata.78376.v3/t24

Observed exclusion limit contour in the (BRe,BRtau) plane for a 1350 GeV stop. All limits are computed at 95% CL.

• #### Expected Contour 13

Data from Figure 6, Auxiliary Figure 14a

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Expected exclusion limit contour in the (BRe,BRtau) plane for a 1400 GeV stop. All limits are computed at 95% CL.

• #### Observed Contour 13

Data from Figure 6, Auxiliary Figure 14a

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Observed exclusion limit contour in the (BRe,BRtau) plane for a 1400 GeV stop. All limits are computed at 95% CL.

• #### Expected Contour 14

Data from Auxiliary Figure 15a

10.17182/hepdata.78376.v3/t27

Expected exclusion limit contour in the (BRe,BRtau) plane for a 1450 GeV stop. All limits are computed at 95% CL.

• #### Observed Contour 14

Data from Auxiliary Figure 15a

10.17182/hepdata.78376.v3/t28

Observed exclusion limit contour in the (BRe,BRtau) plane for a 1450 GeV stop. All limits are computed at 95% CL.

• #### Expected Contour 15

Data from Figure 6, Auxiliary Figure 16a

10.17182/hepdata.78376.v3/t29

Expected exclusion limit contour in the (BRe,BRtau) plane for a 1500 GeV stop. All limits are computed at 95% CL.

• #### Observed Contour 15

Data from Figure 6, Auxiliary Figure 16a

10.17182/hepdata.78376.v3/t30

Observed exclusion limit contour in the (BRe,BRtau) plane for a 1500 GeV stop. All limits are computed at 95% CL.

• #### Acceptance 1

Data from Auxiliary Figure 19a

10.17182/hepdata.78376.v3/t31

Signal acceptance (in %) in the (BRe,BRtau) plane for a 800 GeV stop, for the SR800 signal region.

• #### Acceptance 2

Data from Auxiliary Figure 19b

10.17182/hepdata.78376.v3/t32

Signal acceptance (in %) in the (BRe,BRtau) plane for a 800 GeV stop, for the SR1100 signal region.

• #### Efficiency 1

Data from Auxiliary Figure 19c

10.17182/hepdata.78376.v3/t33

Signal efficiency (in %) in the (BRe,BRtau) plane for a 800 GeV stop, for the SR800 signal region.

• #### Efficiency 2

Data from Auxiliary Figure 19d

10.17182/hepdata.78376.v3/t34

Signal efficiency (in %) in the (BRe,BRtau) plane for a 800 GeV stop, for the SR1100 signal region.

• #### Acceptance 3

Data from Auxiliary Figure 20a

10.17182/hepdata.78376.v3/t35

Signal acceptance (in %) in the (BRe,BRtau) plane for a 1200 GeV stop, for the SR800 signal region.

• #### Acceptance 4

Data from Auxiliary Figure 20b

10.17182/hepdata.78376.v3/t36

Signal acceptance (in %) in the (BRe,BRtau) plane for a 1200 GeV stop, for the SR1100 signal region.

• #### Efficiency 3

Data from Auxiliary Figure 20c

10.17182/hepdata.78376.v3/t37

Signal efficiency (in %) in the (BRe,BRtau) plane for a 1200 GeV stop, for the SR800 signal region.

• #### Efficiency 4

Data from Auxiliary Figure 20d

10.17182/hepdata.78376.v3/t38

Signal efficiency (in %) in the (BRe,BRtau) plane for a 1200 GeV stop, for the SR1100 signal region.

• #### Acceptance 5

Data from Auxiliary Figure 21a

10.17182/hepdata.78376.v3/t39

Signal acceptance (in %) in the (BRe,BRtau) plane for a 1500 GeV stop, for the SR800 signal region.

• #### Acceptance 6

Data from Auxiliary Figure 21b

10.17182/hepdata.78376.v3/t40

Signal acceptance (in %) in the (BRe,BRtau) plane for a 1500 GeV stop, for the SR1100 signal region.

• #### Efficiency 5

Data from Auxiliary Figure 21c

10.17182/hepdata.78376.v3/t41

Signal efficiency (in %) in the (BRe,BRtau) plane for a 1500 GeV stop, for the SR800 signal region.

• #### Efficiency 6

Data from Auxiliary Figure 21d

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Signal efficiency (in %) in the (BRe,BRtau) plane for a 1500 GeV stop, for the SR1100 signal region.

• #### SR distribution 1

Data from Figure 02a

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$m_{bl}^{0}$ distribution in SR800. All selection criteria are applied, except the selection on the variable that is displayed in the...

• #### SR distribution 2

Data from Figure 02b

10.17182/hepdata.78376.v3/t44

$m_{bl}^\mathrm{asym}$ distribution in SR800. All selection criteria are applied, except the selection on the variable that is displayed in the...

• #### SR distribution 3

Data from Figure 02c

10.17182/hepdata.78376.v3/t45

$H_\mathrm{T}$ distribution in SR800. All selection criteria are applied, except the selection on the variable that is displayed in the...

• #### SR distribution 4

Data from Figure 02d

10.17182/hepdata.78376.v3/t46

$m_{ll}$ distribution in SR800. All selection criteria are applied, except the selection on the variable that is displayed in the...

• #### SR distribution 5

Data from Figure 02e

10.17182/hepdata.78376.v3/t47

$m_{bl}^{1}$(rej) distribution in SR800. All selection criteria are applied, except the selection on the variable that is displayed in the...

• #### Table 1

Data from Auxiliary Cutflow Table 1

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Full list of event selections and MC generator-weighted yields and efficiencies in the inclusive SR800 and SR1100 signal regions for...

• #### Cross Section Limit 1

Data from Auxiliary Figure 2b

10.17182/hepdata.78376.v3/t49

Observed exclusion limit in the (BRe,BRtau) plane on the cross section for a 600 GeV stop. All limits are computed...

• #### Cross Section Limit 2

Data from Auxiliary Figure 3b

10.17182/hepdata.78376.v3/t50

Observed exclusion limit in the (BRe,BRtau) plane on the cross section for a 700 GeV stop. All limits are computed...

• #### Cross Section Limit 3

Data from Auxiliary Figure 4b

10.17182/hepdata.78376.v3/t51

Observed exclusion limit in the (BRe,BRtau) plane on the cross section for a 800 GeV stop. All limits are computed...

• #### Cross Section Limit 4

Data from Auxiliary Figure 5b

10.17182/hepdata.78376.v3/t52

Observed exclusion limit in the (BRe,BRtau) plane on the cross section for a 900 GeV stop. All limits are computed...

• #### Cross Section Limit 5

Data from Auxiliary Figure 6b

10.17182/hepdata.78376.v3/t53

Observed exclusion limit in the (BRe,BRtau) plane on the cross section for a 1000 GeV stop. All limits are computed...

• #### Cross Section Limit 6

Data from Auxiliary Figure 7b

10.17182/hepdata.78376.v3/t54

Observed exclusion limit in the (BRe,BRtau) plane on the cross section for a 1050 GeV stop. All limits are computed...

• #### Cross Section Limit 7

Data from Auxiliary Figure 8b

10.17182/hepdata.78376.v3/t55

Observed exclusion limit in the (BRe,BRtau) plane on the cross section for a 1100 GeV stop. All limits are computed...

• #### Cross Section Limit 8

Data from Auxiliary Figure 9b

10.17182/hepdata.78376.v3/t56

Observed exclusion limit in the (BRe,BRtau) plane on the cross section for a 1150 GeV stop. All limits are computed...

• #### Cross Section Limit 9

Data from Auxiliary Figure 10b

10.17182/hepdata.78376.v3/t57

Observed exclusion limit in the (BRe,BRtau) plane on the cross section for a 1200 GeV stop. All limits are computed...

• #### Cross Section Limit 10

Data from Auxiliary Figure 11b

10.17182/hepdata.78376.v3/t58

Observed exclusion limit in the (BRe,BRtau) plane on the cross section for a 1250 GeV stop. All limits are computed...

• #### Cross Section Limit 11

Data from Auxiliary Figure 12b

10.17182/hepdata.78376.v3/t59

Observed exclusion limit in the (BRe,BRtau) plane on the cross section for a 1300 GeV stop. All limits are computed...

• #### Cross Section Limit 12

Data from Auxiliary Figure 13b

10.17182/hepdata.78376.v3/t60

Observed exclusion limit in the (BRe,BRtau) plane on the cross section for a 1350 GeV stop. All limits are computed...

• #### Cross Section Limit 13

Data from Auxiliary Figure 14b

10.17182/hepdata.78376.v3/t61

Observed exclusion limit in the (BRe,BRtau) plane on the cross section for a 1400 GeV stop. All limits are computed...

• #### Cross Section Limit 14

Data from Auxiliary Figure 15b

10.17182/hepdata.78376.v3/t62

Observed exclusion limit in the (BRe,BRtau) plane on the cross section for a 1450 GeV stop. All limits are computed...

• #### Cross Section Limit 15

Data from Auxiliary Figure 16b

10.17182/hepdata.78376.v3/t63

Observed exclusion limit in the (BRe,BRtau) plane on the cross section for a 1500 GeV stop. All limits are computed...

• #### Cross Section Limit 16

Data from Auxiliary Figure 17b

10.17182/hepdata.78376.v3/t64

Observed exclusion limit in the (BRe,BRtau) plane on the cross section for a 1550 GeV stop. All limits are computed...

• #### Cross Section Limit 17

Data from Auxiliary Figure 18b

10.17182/hepdata.78376.v3/t65

Observed exclusion limit in the (BRe,BRtau) plane on the cross section for a 1600 GeV stop. All limits are computed...

• #### Region Choice 1

Data from Auxiliary Figure 2c

10.17182/hepdata.78376.v3/t66

The chosen signal region in the (BRe,BRtau) plane with the best expected exclusion on the cross section for a 600...

• #### Region Choice 2

Data from Auxiliary Figure 3c

10.17182/hepdata.78376.v3/t67

The chosen signal region in the (BRe,BRtau) plane with the best expected exclusion on the cross section for a 700...

• #### Region Choice 3

Data from Auxiliary Figure 4c

10.17182/hepdata.78376.v3/t68

The chosen signal region in the (BRe,BRtau) plane with the best expected exclusion on the cross section for a 800...

• #### Region Choice 4

Data from Auxiliary Figure 5c

10.17182/hepdata.78376.v3/t69

The chosen signal region in the (BRe,BRtau) plane with the best expected exclusion on the cross section for a 900...

• #### Region Choice 5

Data from Auxiliary Figure 6c

10.17182/hepdata.78376.v3/t70

The chosen signal region in the (BRe,BRtau) plane with the best expected exclusion on the cross section for a 1000...

• #### Region Choice 6

Data from Auxiliary Figure 7c

10.17182/hepdata.78376.v3/t71

The chosen signal region in the (BRe,BRtau) plane with the best expected exclusion on the cross section for a 1050...

• #### Region Choice 7

Data from Auxiliary Figure 8c

10.17182/hepdata.78376.v3/t72

The chosen signal region in the (BRe,BRtau) plane with the best expected exclusion on the cross section for a 1100...

• #### Region Choice 8

Data from Auxiliary Figure 9c

10.17182/hepdata.78376.v3/t73

The chosen signal region in the (BRe,BRtau) plane with the best expected exclusion on the cross section for a 1150...

• #### Region Choice 9

Data from Auxiliary Figure 10c

10.17182/hepdata.78376.v3/t74

The chosen signal region in the (BRe,BRtau) plane with the best expected exclusion on the cross section for a 1200...

• #### Region Choice 10

Data from Auxiliary Figure 11c

10.17182/hepdata.78376.v3/t75

The chosen signal region in the (BRe,BRtau) plane with the best expected exclusion on the cross section for a 1250...

• #### Region Choice 11

Data from Auxiliary Figure 12c

10.17182/hepdata.78376.v3/t76

The chosen signal region in the (BRe,BRtau) plane with the best expected exclusion on the cross section for a 1300...

• #### Region Choice 12

Data from Auxiliary Figure 13c

10.17182/hepdata.78376.v3/t77

The chosen signal region in the (BRe,BRtau) plane with the best expected exclusion on the cross section for a 1350...

• #### Region Choice 13

Data from Auxiliary Figure 14c

10.17182/hepdata.78376.v3/t78

The chosen signal region in the (BRe,BRtau) plane with the best expected exclusion on the cross section for a 1400...

• #### Region Choice 14

Data from Auxiliary Figure 15c

10.17182/hepdata.78376.v3/t79

The chosen signal region in the (BRe,BRtau) plane with the best expected exclusion on the cross section for a 1450...

• #### Region Choice 15

Data from Auxiliary Figure 16c

10.17182/hepdata.78376.v3/t80

The chosen signal region in the (BRe,BRtau) plane with the best expected exclusion on the cross section for a 1500...

• #### Region Choice 16

Data from Auxiliary Figure 17c

10.17182/hepdata.78376.v3/t81

The chosen signal region in the (BRe,BRtau) plane with the best expected exclusion on the cross section for a 1550...

• #### Region Choice 17

Data from Auxiliary Figure 18c

10.17182/hepdata.78376.v3/t82

The chosen signal region in the (BRe,BRtau) plane with the best expected exclusion on the cross section for a 1600...

Version 3 modifications: Fixed missing dat & cxx scripts, and swapped y & x axis data for efficiency and acceptance plots.