Search for squarks and gluinos in final states with jets and missing transverse momentum using 139 fb$^{-1}$ of $\sqrt{s}$ =13 TeV $pp$ collision data with the ATLAS detector

The ATLAS collaboration
Conference Paper, 2020.

Abstract
A search for the supersymmetric partners of quarks and gluons (squarks and gluinos) in final states containing jets and missing transverse momentum, but no electrons or muons, is presented. The data used in this search were recorded by the ATLAS experiment in proton-proton collisions at a centre-of-mass energy of $\sqrt{s}$ = 13 TeV during Run 2 of the Large Hadron Collider, corresponding to an integrated luminosity of 139 fb$^{-1}$. The results are interpreted in the context of various $R$-parity-conserving models where squarks and gluinos are produced in pairs or in association and a neutralino is the lightest supersymmetric particle. An exclusion limit at the 95% confidence level on the mass of the gluino is set at 2.30 TeV for a simplified model containing only a gluino and the lightest neutralino, assuming the latter is massless. For a simplified model involving the strong production of mass-degenerate first- and second-generation squarks, squark masses below 1.85 TeV are excluded if the lightest neutralino is massless. These limits extend substantially beyond the region of supersymmetric parameter space excluded previously by similar searches with the ATLAS detector.

  • Post-fit distribution 1

    Data from Figure 8(a)

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    Observed $m_{\mathrm{eff}}$ distributions in signal regions MB-SSd. The histograms show the MC background predictions normalised by the background-only fit. The...

  • Post-fit distribution 2

    Data from Figure 9(a)

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    Observed metSig distributions in signal regions MB-SSd. The histograms show the MC background predictions normalised by the background-only fit. The...

  • Post-fit distribution 3

    Data from Figure 8(b)

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    Observed $m_{\mathrm{eff}}$ distributions in signal regions MB-GGd. The histograms show the MC background predictions normalised by the background-only fit. The...

  • Post-fit distribution 4

    Data from Figure 9(b)

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    Observed metSig distributions in signal regions MB-GGd. The histograms show the MC background predictions normalised by the background-only fit. The...

  • Post-fit distribution 5

    Data from Figure 8(c)

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    Observed $m_{\mathrm{eff}}$ distributions in signal regions MB-C. The histograms show the MC background predictions normalised by the background-only fit. The...

  • Post-fit distribution 6

    Data from Figure 9(c)

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    Observed metSig distributions in signal regions MB-C. The histograms show the MC background predictions normalised by the background-only fit. The...

  • Post-fit distribution 7

    Data from Figure 10(a)

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    Observed BDT-GGd1 score distributions in signal regions GGd1. The histograms show the MC background predictions normalised by the background-only fit....

  • Post-fit distribution 8

    Data from Figure 10(b)

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    Observed BDT-GGo1 score distributions in signal regions GGo1. The histograms show the MC background predictions normalised by the background-only fit....

  • Signal acceptance 1

    Data from Aux.Figure 16(a)

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    Signal region acceptance for simplified model with gluino pair production and decays to two quarks and neutralino in SR BDT-GGd1

  • Signal acceptance 2

    Data from Aux.Figure 17(a)

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    Signal region acceptance for simplified model with gluino pair production and decays to two quarks and neutralino in SR BDT-GGd2

  • Signal acceptance 3

    Data from Aux.Figure 18(a)

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    Signal region acceptance for simplified model with gluino pair production and decays to two quarks and neutralino in SR BDT-GGd3

  • Signal acceptance 4

    Data from Aux.Figure 19(a)

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    Signal region acceptance for simplified model with gluino pair production and decays to two quarks and neutralino in SR BDT-GGd4

  • Signal acceptance 5

    Data from Aux.Figure 24(a)

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    Signal region acceptance for simplified model with gluino pair production and decays to two quarks and chargino in SR BDT-GGo1

  • Signal acceptance 6

    Data from Aux.Figure 25(a)

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    Signal region acceptance for simplified model with gluino pair production and decays to two quarks and chargino in SR BDT-GGo2

  • Signal acceptance 7

    Data from Aux.Figure 26(a)

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    Signal region acceptance for simplified model with gluino pair production and decays to two quarks and chargino in SR BDT-GGo3

  • Signal acceptance 8

    Data from Aux.Figure 27(a)

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    Signal region acceptance for simplified model with gluino pair production and decays to two quarks and chargino in SR BDT-GGo4

  • Signal acceptance 9

    Data from Aux.Figure 13(a)

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    Signal region acceptance for simplified model with squark pair production and decays to a quark and neutralino in SR 2j-1600

  • Signal acceptance 10

    Data from Aux.Figure 14(a)

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    Signal region acceptance for simplified model with squark pair production and decays to a quark and neutralino in SR 2j-2200

  • Signal acceptance 11

    Data from Aux.Figure 15(a)

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    Signal region acceptance for simplified model with squark pair production and decays to a quark and neutralino in SR 2j-2800

  • Signal acceptance 12

    Data from Aux.Figure 20(a)

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    Signal region acceptance for simplified model with gluino pair production and decays to two quarks and neutralino in SR 4j-1000

  • Signal acceptance 13

    Data from Aux.Figure 21(a)

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    Signal region acceptance for simplified model with gluino pair production and decays to two quarks and neutralino in SR 4j-2200

  • Signal acceptance 14

    Data from Aux.Figure 22(a)

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    Signal region acceptance for simplified model with gluino pair production and decays to two quarks and neutralino in SR 4j-3400

  • Signal acceptance 15

    Data from Aux.Figure 23(a)

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    Signal region acceptance for simplified model with gluino pair production and decays to two quarks and neutralino in SR 5j-1600

  • Signal acceptance 16

    Data from Aux.Figure 28(a)

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    Signal region acceptance for simplified model with gluino pair production and decays to two quarks and chargino in SR 6j-1000

  • Signal acceptance 17

    Data from Aux.Figure 29(a)

    10.17182/hepdata.95664.v1/t25

    Signal region acceptance for simplified model with gluino pair production and decays to two quarks and chargino in SR 6j-2200

  • Signal acceptance 18

    Data from Aux.Figure 30(a)

    10.17182/hepdata.95664.v1/t26

    Signal region acceptance for simplified model with gluino pair production and decays to two quarks and chargino in SR 6j-3400

  • Signal efficiency 1

    Data from Aux.Figure 16(b)

    10.17182/hepdata.95664.v1/t27

    Signal region efficiency for simplified model with gluino pair production and decays to two quarks and neutralino in SR BDT-GGd1....

  • Signal efficiency 2

    Data from Aux.Figure 17(b)

    10.17182/hepdata.95664.v1/t28

    Signal region efficiency for simplified model with gluino pair production and decays to two quarks and neutralino in SR BDT-GGd2....

  • Signal efficiency 3

    Data from Aux.Figure 18(b)

    10.17182/hepdata.95664.v1/t29

    Signal region efficiency for simplified model with gluino pair production and decays to two quarks and neutralino in SR BDT-GGd3....

  • Signal efficiency 4

    Data from Aux.Figure 19(b)

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    Signal region efficiency for simplified model with gluino pair production and decays to two quarks and neutralino in SR BDT-GGd4....

  • Signal efficiency 5

    Data from Aux.Figure 24(b)

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    Signal region efficiency for simplified model with gluino pair production and decays to two quarks and chargino in SR BDT-GGo1....

  • Signal efficiency 6

    Data from Aux.Figure 25(b)

    10.17182/hepdata.95664.v1/t32

    Signal region efficiency for simplified model with gluino pair production and decays to two quarks and chargino in SR BDT-GGo2....

  • Signal efficiency 7

    Data from Aux.Figure 26(b)

    10.17182/hepdata.95664.v1/t33

    Signal region efficiency for simplified model with gluino pair production and decays to two quarks and chargino in SR BDT-GGo3....

  • Signal efficiency 8

    Data from Aux.Figure 27(b)

    10.17182/hepdata.95664.v1/t34

    Signal region efficiency for simplified model with gluino pair production and decays to two quarks and chargino in SR BDT-GGo4....

  • Signal efficiency 9

    Data from Aux.Figure 13(b)

    10.17182/hepdata.95664.v1/t35

    Signal region efficiency for simplified model with squark pair production and decays to a quark and neutralino in SR 2j-1600....

  • Signal efficiency 10

    Data from Aux.Figure 14(b)

    10.17182/hepdata.95664.v1/t36

    Signal region efficiency for simplified model with squark pair production and decays to a quark and neutralino in SR 2j-2200....

  • Signal efficiency 11

    Data from Aux.Figure 15(b)

    10.17182/hepdata.95664.v1/t37

    Signal region efficiency for simplified model with squark pair production and decays to a quark and neutralino in SR 2j-2800....

  • Signal efficiency 12

    Data from Aux.Figure 20(b)

    10.17182/hepdata.95664.v1/t38

    Signal region efficiency for simplified model with gluino pair production and decays to two quarks and neutralino in SR 4j-1000....

  • Signal efficiency 13

    Data from Aux.Figure 21(b)

    10.17182/hepdata.95664.v1/t39

    Signal region efficiency for simplified model with gluino pair production and decays to two quarks and neutralino in SR 4j-2200....

  • Signal efficiency 14

    Data from Aux.Figure 22(b)

    10.17182/hepdata.95664.v1/t40

    Signal region efficiency for simplified model with gluino pair production and decays to two quarks and neutralino in SR 4j-3400....

  • Signal efficiency 15

    Data from Aux.Figure 23(b)

    10.17182/hepdata.95664.v1/t41

    Signal region efficiency for simplified model with gluino pair production and decays to two quarks and neutralino in SR 5j-1600....

  • Signal efficiency 16

    Data from Aux.Figure 28(b)

    10.17182/hepdata.95664.v1/t42

    Signal region efficiency for simplified model with gluino pair production and decays to two quarks and chargino in SR 6j-1000....

  • Signal efficiency 17

    Data from Aux.Figure 29(b)

    10.17182/hepdata.95664.v1/t43

    Signal region efficiency for simplified model with gluino pair production and decays to two quarks and chargino in SR 6j-2200....

  • Signal efficiency 18

    Data from Aux.Figure 30(b)

    10.17182/hepdata.95664.v1/t44

    Signal region efficiency for simplified model with gluino pair production and decays to two quarks and chargino in SR 6j-3400....

  • Exp.Contour 1

    Data from Figure 13

    10.17182/hepdata.95664.v1/t45

    Exclusion limits in the mass plane of the lightest neutralino and first- and second-generation squarks assuming squark pair production and...

  • Obs.Contour 1

    Data from Figure 13

    10.17182/hepdata.95664.v1/t46

    Exclusion limits in the mass plane of the lightest neutralino and first- and second-generation squarks assuming squark pair production and...

  • Exp.Contour 2

    Data from Figure 13

    10.17182/hepdata.95664.v1/t47

    Exclusion limits in the mass plane of the lightest neutralino and non degenerated squark pair production and direct decays obtained...

  • Obs.Contour 2

    Data from Figure 13

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    Exclusion limits in the mass plane of the lightest neutralino and non degenerated squark pair production and direct decays obtained...

  • Exp.Contour 3

    Data from Figure 14

    10.17182/hepdata.95664.v1/t49

    Exclusion limits in the mass plane of the lightest neutralino and the gluino for gluino pair production with direct decays...

  • Obs.Contour 3

    Data from Figure 14

    10.17182/hepdata.95664.v1/t50

    Exclusion limits in the mass plane of the lightest neutralino and the gluino for gluino pair production with direct decays...

  • Exp.Contour 4

    Data from Figure 15(a)

    10.17182/hepdata.95664.v1/t51

    Exclusion limits in the mass plane of the lightest neutralino and squarks. The expected limits are indicated with dark dashed...

  • Obs.Contour 4

    Data from Figure 15(a)

    10.17182/hepdata.95664.v1/t52

    Exclusion limits in the mass plane of the lightest neutralino and squarks. The observed limits are indicated by the medium...

  • Exp.Contour 5

    Data from Figure 15(b)

    10.17182/hepdata.95664.v1/t53

    Exclusion limits for squark pair production with a one-step decay via an intermediate chargino. The neutralino mass is fixed at...

  • Obs.Contour 5

    Data from Figure 15(b)

    10.17182/hepdata.95664.v1/t54

    Exclusion limits for squark pair production with a one-step decay via an intermediate chargino. The neutralino mass is fixed at...

  • Exp.Contour 6

    Data from Figure 16(a)

    10.17182/hepdata.95664.v1/t55

    Exclusion limits in the mass plane of the lightest neutralino and gluinos. The expected limits are indicated with dark dashed...

  • Obs.Contour 6

    Data from Figure 16(a)

    10.17182/hepdata.95664.v1/t56

    Exclusion limits in the mass plane of the lightest neutralino and gluinos. The observed limits are indicated by the medium...

  • Exp.Contour 7

    Data from Figure 16(b)

    10.17182/hepdata.95664.v1/t57

    Exclusion limits for gluino pair production with a one-step decay via an intermediate chargino. The neutralino mass is fixed at...

  • Obs.Contour 7

    Data from Figure 16(b)

    10.17182/hepdata.95664.v1/t58

    Exclusion limits for gluino pair production with a one-step decay via an intermediate chargino. The neutralino mass is fixed at...

  • Exp.Contour 8

    Data from Figure 17(a)

    10.17182/hepdata.95664.v1/t59

    Exclusion limits for the model with combined production of squark pairs, gluino pairs, and of squark--gluino pairs. The neutralino mass...

  • Obs.Contour 8

    Data from Figure 17(a)

    10.17182/hepdata.95664.v1/t60

    Exclusion limits for the model with combined production of squark pairs, gluino pairs, and of squark--gluino pairs. The neutralino mass...

  • Exp.Contour 9

    Data from Figure 17(b)

    10.17182/hepdata.95664.v1/t61

    Exclusion limits for the model with combined production of squark pairs, gluino pairs, and of squark--gluino pairs. The neutralino mass...

  • Obs.Contour 9

    Data from Figure 17(b)

    10.17182/hepdata.95664.v1/t62

    Exclusion limits for the model with combined production of squark pairs, gluino pairs, and of squark--gluino pairs. The neutralino mass...

  • Exp.Contour 10

    Data from Figure 17(c)

    10.17182/hepdata.95664.v1/t63

    Exclusion limits for the model with combined production of squark pairs, gluino pairs, and of squark--gluino pairs. The neutralino mass...

  • Obs.Contour 10

    Data from Figure 17(c)

    10.17182/hepdata.95664.v1/t64

    Exclusion limits for the model with combined production of squark pairs, gluino pairs, and of squark--gluino pairs. The neutralino mass...

  • X-section U.L. 1

    Data from Aux.Figure 10(a)

    10.17182/hepdata.95664.v1/t65

    The observed upper limits on signal cross section corresponding to the best expected signal region in each mass point for...

  • X-section U.L. 2

    Data from Aux.Figure 10(b)

    10.17182/hepdata.95664.v1/t66

    The observed upper limits on signal cross section corresponding to the best expected signal region in each mass point for...

  • X-section U.L 3

    Data from Aux.Figure 11(a)

    10.17182/hepdata.95664.v1/t67

    The observed upper limits on signal cross section corresponding to the best expected signal region in each mass point for...

  • X-section U.L 4

    Data from Aux.Figure 11(b)

    10.17182/hepdata.95664.v1/t68

    The observed upper limits on signal cross section corresponding to the best expected signal region in each mass point for...

  • X-section U.L 5

    Data from Aux.Figure 12(a)

    10.17182/hepdata.95664.v1/t69

    The observed upper limits on signal cross section corresponding to the best expected signal region in each mass point for...

  • X-section U.L 6

    Data from Aux.Figure 12(b)

    10.17182/hepdata.95664.v1/t70

    The observed upper limits on signal cross section corresponding to the best expected signal region in each mass point for...

  • Cut flow 1

    Data from Aux.Table 10

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    Cut-flow for model-independent search regions targeting squarks for SS direct model points. Expected yields are normalized to a luminosity of...

  • Cut flow 2

    Data from Aux.Table 11

    10.17182/hepdata.95664.v1/t72

    Cut-flow for model-independent search regions targeting gluinos for GG direct model points. Expected yields are normalized to a luminosity of...

  • Cut flow 3

    Data from Aux.Table 12

    10.17182/hepdata.95664.v1/t73

    Cut-flow for model-independent search regions targeting squarks and gluinos in models with one-step decay. Expected yields are normalized to a...

  • Cut flow 4

    Data from Aux.Table 13

    10.17182/hepdata.95664.v1/t74

    Cut-flow for BDT search regions targeting gluinos in models with one-step decays. Expected yields are normalized to a luminosity of...

  • Cut flow 5

    Data from Aux.Table 14

    10.17182/hepdata.95664.v1/t75

    Cut-flow for BDT search regions targeting gluinos in models with direct decays. Expected yields are normalized to a luminosity of...

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