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Search for R-parity-violating supersymmetry in a final state containing leptons and many jets with the ATLAS experiment using $\sqrt{s} = 13\hbox { TeV}$ proton–proton collision data

The ATLAS collaboration
Eur.Phys.J.C 81 (2021) 1023, 2021.

Abstract (data abstract)
CERN-LHC. A search for R-parity violating supersymmetry in final states characterised by high jet multiplicity, at least one isolated light lepton and either zero or at least three $b$-tagged jets is presented. The search uses 139 fb$^{-1}$ of $\sqrt{s} = 13$ TeV proton-proton collision data collected by the ATLAS experiment during Run 2 of the Large Hadron Collider. The results are interpreted in the context of R-parity-violating supersymmetry models that feature gluino production, top-squark production, or electroweakino production. The dominant sources of background are estimated using a data-driven model, based on observables at medium jet multiplicity, to predict the $b$-tagged jet multiplicity distribution at the higher jet multiplicities used in the search. Machine learning techniques are used to reach sensitivity to electroweakino production, extending the data-driven background estimation to the shape of the machine learning discriminant. No significant excess over the Standard Model expectation is observed and exclusion limits at the 95% confidence-level are extracted, reaching as high as 2.4 TeV in gluino mass, 1.35 TeV in top-squark mass, and 320 (365) GeV in higgsino (wino) mass.

  • Distribution: 1

    Figure 5

    10.17182/hepdata.104860.v1/t1

    The observed data event yields and the corresponding estimates for the backgrounds in the different $b$-jet multiplicity bins for the...

  • Distribution: 2

    Figure 5

    10.17182/hepdata.104860.v1/t2

    The observed data event yields and the corresponding estimates for the backgrounds in the different $b$-jet multiplicity bins for the...

  • Distribution: 3

    Figure 5

    10.17182/hepdata.104860.v1/t3

    The observed data event yields and the corresponding estimates for the backgrounds in the different $b$-jet multiplicity bins for the...

  • Distribution: 4

    Figure 5

    10.17182/hepdata.104860.v1/t4

    The observed data event yields and the corresponding estimates for the backgrounds in the different $b$-jet multiplicity bins for the...

  • Distribution: 5

    Figure 5

    10.17182/hepdata.104860.v1/t5

    The observed data event yields and the corresponding estimates for the backgrounds in the different $b$-jet multiplicity bins for the...

  • Distribution: 6

    Figure 5

    10.17182/hepdata.104860.v1/t6

    The observed data event yields and the corresponding estimates for the backgrounds in the different $b$-jet multiplicity bins for the...

  • Distribution: 7

    Figure 5

    10.17182/hepdata.104860.v1/t7

    The observed data event yields and the corresponding estimates for the backgrounds in the different $b$-jet multiplicity bins for the...

  • Distribution: 8

    Figure 5

    10.17182/hepdata.104860.v1/t8

    The observed data event yields and the corresponding estimates for the backgrounds in the different $b$-jet multiplicity bins for the...

  • Distribution: 9

    Figure 5

    10.17182/hepdata.104860.v1/t9

    The observed data event yields and the corresponding estimates for the backgrounds in the different $b$-jet multiplicity bins for the...

  • Distribution: 10

    Figure 5

    10.17182/hepdata.104860.v1/t10

    The observed data event yields and the corresponding estimates for the backgrounds in the different $b$-jet multiplicity bins for the...

  • Distribution: 11

    Figure 5

    10.17182/hepdata.104860.v1/t11

    The observed data event yields and the corresponding estimates for the backgrounds in the different $b$-jet multiplicity bins for the...

  • Distribution: 12

    Figure 5

    10.17182/hepdata.104860.v1/t12

    The observed data event yields and the corresponding estimates for the backgrounds in the different $b$-jet multiplicity bins for the...

  • Distribution: 13

    Figure 6

    10.17182/hepdata.104860.v1/t13

    The observed data event yields and the corresponding estimates for the backgrounds in the different $b$-jet multiplicity bins for the...

  • Distribution: 14

    Figure 6

    10.17182/hepdata.104860.v1/t14

    The observed data event yields and the corresponding estimates for the backgrounds in the different $b$-jet multiplicity bins for the...

  • Distribution: 15

    Figure 6

    10.17182/hepdata.104860.v1/t15

    The observed data event yields and the corresponding estimates for the backgrounds in the different $b$-jet multiplicity bins for the...

  • Distribution: 16

    Figure 6

    10.17182/hepdata.104860.v1/t16

    The observed data event yields and the corresponding estimates for the backgrounds in the different $b$-jet multiplicity bins for the...

  • Distribution: 17

    Figure 6

    10.17182/hepdata.104860.v1/t17

    The observed data event yields and the corresponding estimates for the backgrounds in the different $b$-jet multiplicity bins for the...

  • Distribution: 18

    Figure 6

    10.17182/hepdata.104860.v1/t18

    The observed data event yields and the corresponding estimates for the backgrounds in the different $b$-jet multiplicity bins for the...

  • Distribution: 19

    Figure 6

    10.17182/hepdata.104860.v1/t19

    The observed data event yields and the corresponding estimates for the backgrounds in the different $b$-jet multiplicity bins for the...

  • Distribution: 20

    Figure 8

    10.17182/hepdata.104860.v1/t20

    The observed data event yields and the corresponding estimates for the backgrounds in the different $b$-jet multiplicity bins for the...

  • Distribution: 21

    Figure 8

    10.17182/hepdata.104860.v1/t21

    The observed data event yields and the corresponding estimates for the backgrounds in the different $b$-jet multiplicity bins for the...

  • Distribution: 22

    Figure 8

    10.17182/hepdata.104860.v1/t22

    The observed data event yields and the corresponding estimates for the backgrounds in the different $b$-jet multiplicity bins for the...

  • Distribution: 23

    Figure 8

    10.17182/hepdata.104860.v1/t23

    The observed data event yields and the corresponding estimates for the backgrounds in the different $b$-jet multiplicity bins for the...

  • Distribution: 24

    Figure 8

    10.17182/hepdata.104860.v1/t24

    The observed data event yields and the corresponding estimates for the backgrounds in the different $b$-jet multiplicity bins for the...

  • Distribution: 25

    Figure 8

    10.17182/hepdata.104860.v1/t25

    The observed data event yields and the corresponding estimates for the backgrounds in the different $b$-jet multiplicity bins for the...

  • Distribution: 26

    Figure 8

    10.17182/hepdata.104860.v1/t26

    The observed data event yields and the corresponding estimates for the backgrounds in the different $b$-jet multiplicity bins for the...

  • Distribution: 27

    Figure 8

    10.17182/hepdata.104860.v1/t27

    The observed data event yields and the corresponding estimates for the backgrounds in the different $b$-jet multiplicity bins for the...

  • Distribution: 28

    Figure 8

    10.17182/hepdata.104860.v1/t28

    The observed data event yields and the corresponding estimates for the backgrounds in the different $b$-jet multiplicity bins for the...

  • Distribution: 29

    Figure 8

    10.17182/hepdata.104860.v1/t29

    The observed data event yields and the corresponding estimates for the backgrounds in the different $b$-jet multiplicity bins for the...

  • Event yields: 1

    Table 6

    10.17182/hepdata.104860.v1/t30

    Data event yields compared with the expected contributions from relevant background sources, in the discovery signal regions defined for the...

  • Event yields: 2

    Table 7

    10.17182/hepdata.104860.v1/t31

    Data event yields compared with the expected contributions from relevant background sources, in the discovery signal regions defined for the...

  • Expected contour: 1

    Figure 9

    10.17182/hepdata.104860.v1/t32

    Expected 95% CL exclusion contour for the gluino $\tilde{g}\rightarrow q\bar{q}\tilde{\chi}^0_1\rightarrow q\bar{q}q\bar{q} \ell\nu$ model.

  • Observed contour: 1

    Figure 9

    10.17182/hepdata.104860.v1/t33

    Observed 95% CL exclusion contour for the gluino $\tilde{g}\rightarrow q\bar{q}\tilde{\chi}^0_1\rightarrow q\bar{q}q\bar{q} \ell\nu$ model.

  • Expected contour: 2

    Figure 9

    10.17182/hepdata.104860.v1/t34

    Expected 95% CL exclusion contour for the gluino $\tilde{g}\rightarrow \bar{t}\tilde{t} \rightarrow \bar{t}\bar{b}\bar{s}$ model.

  • Observed contour: 2

    Figure 9

    10.17182/hepdata.104860.v1/t35

    Observed 95% CL exclusion contour for the gluino $\tilde{g}\rightarrow \bar{t}\tilde{t} \rightarrow \bar{t}\bar{b}\bar{s}$ model.

  • Expected contour: 3

    Figure 9

    10.17182/hepdata.104860.v1/t36

    Expected 95% CL exclusion contour for the gluino $\tilde{g}\rightarrow t\bar{t}\tilde{\chi}^0_1 \rightarrow t\bar{t} tbs$ model with bino LSP.

  • Observed contour: 3

    Figure 9

    10.17182/hepdata.104860.v1/t37

    Observed 95% CL exclusion contour for the gluino $\tilde{g}\rightarrow t\bar{t}\tilde{\chi}^0_1 \rightarrow t\bar{t} tbs$ model with bino LSP.

  • Expected contour: 4

    Figure 9

    10.17182/hepdata.104860.v1/t38

    Expected 95% CL exclusion contour for the gluino $\tilde{g}\rightarrow t\bar{t}\tilde{\chi}^0_1 \rightarrow t\bar{t} tbs$ model with higgsino LSP.

  • Observed contour: 4

    Figure 9

    10.17182/hepdata.104860.v1/t39

    Observed 95% CL exclusion contour for the gluino $\tilde{g}\rightarrow t\bar{t}\tilde{\chi}^0_1 \rightarrow t\bar{t} tbs$ model with higgsino LSP.

  • Expected contour: 5

    Figure 9

    10.17182/hepdata.104860.v1/t40

    Expected 95% CL exclusion contour for the gluino $\tilde{g}\rightarrow t\bar{t}\tilde{\chi}^0_1 \rightarrow t\bar{t} tbs$ model with wino LSP.

  • Observed contour: 5

    Figure 9

    10.17182/hepdata.104860.v1/t41

    Observed 95% CL exclusion contour for the gluino $\tilde{g}\rightarrow t\bar{t}\tilde{\chi}^0_1 \rightarrow t\bar{t} tbs$ model with wino LSP.

  • Expected contour: 6

    Figure 9

    10.17182/hepdata.104860.v1/t42

    Expected 95% CL exclusion contour for the stop pair production model with bino LSP.

  • Observed contour: 6

    Figure 9

    10.17182/hepdata.104860.v1/t43

    Observed 95% CL exclusion contour for the stop pair production model with bino LSP.

  • Expected contour: 7

    Figure 9

    10.17182/hepdata.104860.v1/t44

    Expected 95% CL exclusion contour for the stop pair production model with higgsino LSP.

  • Observed contour: 7

    Figure 9

    10.17182/hepdata.104860.v1/t45

    Observed 95% CL exclusion contour for the stop pair production model with higgsino LSP.

  • Expected contour: 8

    Figure 9

    10.17182/hepdata.104860.v1/t46

    Expected 95% CL exclusion contour for the stop pair production model with wino LSP.

  • Observed contour: 8

    Figure 9

    10.17182/hepdata.104860.v1/t47

    Observed 95% CL exclusion contour for the stop pair production model with wino LSP.

  • Expected exclusion: 1

    Figure 10

    10.17182/hepdata.104860.v1/t48

    Expected 95% CL excluded cross section for the RPV model with electroweakino prodiction with higgsino LSP hypothesis.

  • Observed exclusion: 1

    Figure 10

    10.17182/hepdata.104860.v1/t49

    Observed 95% CL excluded cross section for the RPV model with electroweakino prodiction with higgsino LSP hypothesis.

  • Expected exclusion: 2

    Figure 10

    10.17182/hepdata.104860.v1/t50

    Expected 95% CL excluded cross section for the RPV model with electroweakino prodiction with wino LSP hypothesis.

  • Observed exclusion: 2

    Figure 10

    10.17182/hepdata.104860.v1/t51

    Observed 95% CL excluded cross section for the RPV model with electroweakino prodiction with wino LSP hypothesis.

  • Background yields: 1

    Auxiliary table 1

    10.17182/hepdata.104860.v1/t52

    Data event yields compared with the expected contributions from relevant background sources, in the discovery signal regions defined for the...

  • Background yields: 2

    Auxiliary table 2

    10.17182/hepdata.104860.v1/t53

    Data event yields compared with the expected contributions from relevant background sources, in the discovery signal regions defined for the...

  • Background yields: 3

    Auxiliary table 3

    10.17182/hepdata.104860.v1/t54

    Data event yields compared with the expected contributions from relevant background sources, in the discovery signal regions defined for the...

  • Background yields: 4

    Auxiliary table 4

    10.17182/hepdata.104860.v1/t55

    Data event yields compared with the expected contributions from relevant background sources, in the discovery signal regions defined for the...

  • Expected exclusion: 3

    Auxiliary figure 9

    10.17182/hepdata.104860.v1/t56

    Expected 95% CL excluded cross section for the gluino $\tilde{g}\rightarrow q\bar{q}\tilde{\chi}^0_1\rightarrow q\bar{q}q\bar{q} \ell\nu$ model.

  • Observed exclusion: 3

    Auxiliary figure 9

    10.17182/hepdata.104860.v1/t57

    Observed 95% CL excluded cross section for the gluino $\tilde{g}\rightarrow q\bar{q}\tilde{\chi}^0_1\rightarrow q\bar{q}q\bar{q} \ell\nu$ model.

  • Expected exclusion: 4

    Auxiliary figure 10

    10.17182/hepdata.104860.v1/t58

    Expected 95% CL excluded cross section for the gluino $\tilde{g}\rightarrow \bar{t}\tilde{t} \rightarrow \bar{t}\bar{b}\bar{s}$ model.

  • Observed exclusion: 4

    Auxiliary figure 10

    10.17182/hepdata.104860.v1/t59

    Observed 95% CL excluded cross section for the gluino $\tilde{g}\rightarrow \bar{t}\tilde{t} \rightarrow \bar{t}\bar{b}\bar{s}$ model.

  • Expected exclusion: 5

    Auxiliary figure 11

    10.17182/hepdata.104860.v1/t60

    Expected 95% CL excluded cross section for the gluino $\tilde{g}\rightarrow t\bar{t}\tilde{\chi}^0_1 \rightarrow t\bar{t} tbs$ model with bino LSP.

  • Observed exclusion: 5

    Auxiliary figure 11

    10.17182/hepdata.104860.v1/t61

    Observed 95% CL excluded cross section for the gluino $\tilde{g}\rightarrow t\bar{t}\tilde{\chi}^0_1 \rightarrow t\bar{t} tbs$ model with bino LSP.

  • Expected exclusion: 6

    Auxiliary figure 11

    10.17182/hepdata.104860.v1/t62

    Expected 95% CL excluded cross section for the gluino $\tilde{g}\rightarrow t\bar{t}\tilde{\chi}^0_1 \rightarrow t\bar{t} tbs$ model with wino LSP.

  • Observed exclusion: 6

    Auxiliary figure 11

    10.17182/hepdata.104860.v1/t63

    Observed 95% CL excluded cross section for the gluino $\tilde{g}\rightarrow t\bar{t}\tilde{\chi}^0_1 \rightarrow t\bar{t} tbs$ model with wino LSP.

  • Expected exclusion: 7

    Auxiliary figure 11

    10.17182/hepdata.104860.v1/t64

    Expected 95% CL excluded cross section for the gluino $\tilde{g}\rightarrow t\bar{t}\tilde{\chi}^0_1 \rightarrow t\bar{t} tbs$ model with higgsino LSP.

  • Observed exclusion: 7

    Auxiliary figure 11

    10.17182/hepdata.104860.v1/t65

    Observed 95% CL excluded cross section for the gluino $\tilde{g}\rightarrow t\bar{t}\tilde{\chi}^0_1 \rightarrow t\bar{t} tbs$ model with higgsino LSP.

  • Expected exclusion: 8

    Auxiliary figure 12

    10.17182/hepdata.104860.v1/t66

    Expected 95% CL excluded cross section for the stop pair production model with bino LSP.

  • Observed exclusion: 8

    Auxiliary figure 12

    10.17182/hepdata.104860.v1/t67

    Observed 95% CL excluded cross section for the stop pair production model with bino LSP.

  • Expected exclusion: 9

    Auxiliary figure 12

    10.17182/hepdata.104860.v1/t68

    Expected 95% CL excluded cross section for the stop pair production model with wino LSP.

  • Observed exclusion: 9

    Auxiliary figure 12

    10.17182/hepdata.104860.v1/t69

    Observed 95% CL excluded cross section for the stop pair production model with wino LSP.

  • Expected exclusion: 10

    Auxiliary figure 12

    10.17182/hepdata.104860.v1/t70

    Expected 95% CL excluded cross section for the stop pair production model with higgsino LSP.

  • Observed exclusion: 10

    Auxiliary figure 12

    10.17182/hepdata.104860.v1/t71

    Observed 95% CL excluded cross section for the stop pair production model with higgsino LSP.

  • Acceptance/Efficiency: 1

    Auxiliary figure 13

    10.17182/hepdata.104860.v1/t72

    Acceptance and efficiency for the gluino $\tilde{g}\rightarrow q\bar{q}\tilde{\chi}^0_1\rightarrow q\bar{q}q\bar{q} \ell\nu$ model in the $1\ell$ category.

  • Acceptance/Efficiency: 2

    Auxiliary figure 13

    10.17182/hepdata.104860.v1/t73

    Acceptance and efficiency for the gluino $\tilde{g}\rightarrow q\bar{q}\tilde{\chi}^0_1\rightarrow q\bar{q}q\bar{q} \ell\nu$ model in the $2\ell^{\mathrm{sc}}$ category.

  • Acceptance/Efficiency: 3

    Auxiliary figure 14

    10.17182/hepdata.104860.v1/t74

    Acceptance and efficiency for the gluino $\tilde{g}\rightarrow \bar{t}\tilde{t} \rightarrow \bar{t}\bar{b}\bar{s}$ model in the $1\ell$ category.

  • Acceptance/Efficiency: 4

    Auxiliary figure 14

    10.17182/hepdata.104860.v1/t75

    Acceptance and efficiency for the gluino $\tilde{g}\rightarrow \bar{t}\tilde{t} \rightarrow \bar{t}\bar{b}\bar{s}$ model in the $2\ell^{\mathrm{sc}}$ category.

  • Acceptance/Efficiency: 5

    Auxiliary figure 15

    10.17182/hepdata.104860.v1/t76

    Acceptance and efficiency for the gluino $\tilde{g}\rightarrow t\bar{t}\tilde{\chi}^0_1 \rightarrow t\bar{t} tbs$ model with higgsino LSP in the $1\ell$ category.

  • Acceptance/Efficiency: 6

    Auxiliary figure 15

    10.17182/hepdata.104860.v1/t77

    Acceptance and efficiency for the gluino $\tilde{g}\rightarrow t\bar{t}\tilde{\chi}^0_1 \rightarrow t\bar{t} tbs$ model with higgsino LSP in the $2\ell^{\mathrm{sc}}$ category.

  • Acceptance/Efficiency: 7

    Auxiliary figure 16

    10.17182/hepdata.104860.v1/t78

    Acceptance and efficiency for the stop model with higgsino LSP in the $1\ell$ category.

  • Acceptance/Efficiency: 8

    Auxiliary figure 16

    10.17182/hepdata.104860.v1/t79

    Acceptance and efficiency for the stop model with higgsino LSP in the $2\ell^{\mathrm{sc}}$ category.

  • Acceptance/Efficiency: 9

    Auxiliary figure 17

    10.17182/hepdata.104860.v1/t80

    Acceptance and efficiency for the or the electroweakino production model in the EWK analysis discovery SR for the $1\ell$ category...

  • Acceptance/Efficiency: 10

    Auxiliary figure 17

    10.17182/hepdata.104860.v1/t81

    Acceptance and efficiency for the or the electroweakino production model in the EWK analysis discovery SR for the $1\ell$ category...

  • Acceptance/Efficiency: 11

    Auxiliary figure 17

    10.17182/hepdata.104860.v1/t82

    Acceptance and efficiency for the or the electroweakino production model in the EWK analysis discovery SR for the $1\ell$ category...

  • Acceptance/Efficiency: 12

    Auxiliary figure 17

    10.17182/hepdata.104860.v1/t83

    Acceptance and efficiency for the or the electroweakino production model in the EWK analysis discovery SR for the $1\ell$ category...

  • Acceptance/Efficiency: 13

    Auxiliary figure 17

    10.17182/hepdata.104860.v1/t84

    Acceptance and efficiency for the or the electroweakino production model in the EWK analysis discovery SR for the $1\ell$ category...

  • Acceptance/Efficiency: 14

    Auxiliary figure 17

    10.17182/hepdata.104860.v1/t85

    Acceptance and efficiency for the or the electroweakino production model in the EWK analysis discovery SR for the $2\ell^{\mathrm{sc}}$ category,...

  • Acceptance/Efficiency: 15

    Auxiliary figure 17

    10.17182/hepdata.104860.v1/t86

    Acceptance and efficiency for the or the electroweakino production model in the EWK analysis discovery SR for the $1\ell$ category...

  • Acceptance/Efficiency: 16

    Auxiliary figure 17

    10.17182/hepdata.104860.v1/t87

    Acceptance and efficiency for the or the electroweakino production model in the EWK analysis discovery SR for the $1\ell$ category...

  • Acceptance/Efficiency: 17

    Auxiliary figure 17

    10.17182/hepdata.104860.v1/t88

    Acceptance and efficiency for the or the electroweakino production model in the EWK analysis discovery SR for the $1\ell$ category...

  • Acceptance/Efficiency: 18

    Auxiliary figure 17

    10.17182/hepdata.104860.v1/t89

    Acceptance and efficiency for the or the electroweakino production model in the EWK analysis discovery SR for the $1\ell$ category...

  • Acceptance/Efficiency: 19

    Auxiliary figure 17

    10.17182/hepdata.104860.v1/t90

    Acceptance and efficiency for the or the electroweakino production model in the EWK analysis discovery SR for the $1\ell$ category...

  • Acceptance/Efficiency: 20

    Auxiliary figure 17

    10.17182/hepdata.104860.v1/t91

    Acceptance and efficiency for the or the electroweakino production model in the EWK analysis discovery SR for the $2\ell^{\mathrm{sc}}$ category,...

  • Cutflow: 1

    Auxiliary table 5

    10.17182/hepdata.104860.v1/t92

    Cut flow for the gluino $\tilde{g}\rightarrow q\bar{q}\tilde{\chi}^0_1\rightarrow q\bar{q}q\bar{q} \ell\nu$ model with $m_{\tilde{g}} = 2$ TeV and $m_{\tilde{\chi}^0_1} = 1$ TeV....

  • Cutflow: 2

    Auxiliary table 6

    10.17182/hepdata.104860.v1/t93

    Cut flow for the gluino $\tilde{g}\rightarrow \bar{t}\tilde{t} \rightarrow \bar{t}\bar{b}\bar{s}$ model with with $m_{\tilde{g}} = 1.6$ TeV and $m_{\tilde{t}} = 1$...

  • Cutflow: 3

    Auxiliary table 7

    10.17182/hepdata.104860.v1/t94

    Cut flow for the gluino $\tilde{g}\rightarrow t\bar{t}\tilde{\chi}^0_1 \rightarrow t\bar{t} tbs$ model with $m_{\tilde{g}} = 2.2$ TeV and $m_{\tilde{\chi}^0_1} = 1.05$...

  • Cutflow: 4

    Auxiliary table 8

    10.17182/hepdata.104860.v1/t95

    Cut flow for the stop model with $m_{\tilde{t}} = 1.175$ TeV and $m_{\tilde{\chi}^0_1} = 0.7$ TeV. The column labelled $\mathrm{N}_{\mathrm{raw}}$...

  • Cutflow: 5

    Auxiliary table 9

    10.17182/hepdata.104860.v1/t96

    Cut flow for the electroweakino production model, considering only the production of $\tilde{\chi}^{\pm}_1 \tilde{\chi}^0_1$, with $m(\tilde{\chi}^{\pm}_1,\tilde{\chi}^0_1)= 250$ GeV. The column...

  • Cutflow: 6

    Auxiliary table 10

    10.17182/hepdata.104860.v1/t97

    Cut flow for the electroweakino production model, considering only the production of $\tilde{\chi}^0_1 \tilde{\chi}^0_2$, with $m(\tilde{\chi}^0_1,\tilde{\chi}^0_2)= 250$ GeV. The column...

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