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Search for chargino-neutralino production using recursive jigsaw reconstruction in final states with two or three charged leptons in proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

The collaboration
No Journal Information, 2018

Abstract (data abstract)
CERN-LHC. A search for electroweak production of supersymmetric particles is performed in two-lepton and three-lepton final states using recursive jigsaw reconstruction. The search uses data collected in 2015 and 2016 by the ATLAS experiment in $\sqrt{s}$ = 13 TeV proton--proton collisions at the CERN Large Hadron Collider corresponding to an integrated luminosity of 36.1 $\textrm{fb}^{-1}$. Chargino--neutralino pair production, with decays via $W/Z$ bosons, is studied in final states involving leptons and jets and missing transverse momentum for scenarios with large and intermediate mass-splittings between the parent particle and lightest supersymmetric particle, as well as for the scenario where this mass splitting is close to the mass of the $Z$ boson. The latter case is challenging since the vector bosons are produced with kinematic properties that are similar to those in Standard Model processes. Results are found to be compatible with the Standard Model expectations in the signal regions targeting large and intermediate mass-splittings, and chargino--neutralino masses up to 600 GeV are excluded at 95% confidence level for a massless lightest supersymmetric particle. Excesses of data above the expected background are found in the signal regions targeting low mass-splittings, and the largest local excess amounts to 3.0 standard deviations.

• #### Distribution 1

Data from figure 10a

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Distributions of kinematic variables in the signal regions for the $2\ell$ channels after applying all selection requirements. The histograms show...

• #### Distribution 2

Data from figure 10b

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Distributions of kinematic variables in the signal regions for the $2\ell$ channels after applying all selection requirements. The histograms show...

• #### Distribution 3

Data from figure 10c

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Distributions of kinematic variables in the signal regions for the $2\ell$ channels after applying all selection requirements. The histograms show...

• #### Distribution 4

Data from figure 10d

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Distributions of kinematic variables in the signal regions for the $2\ell$ channels after applying all selection requirements. The histograms show...

• #### Distribution 5

Data from figure 11a

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Distributions of kinematic variables in the signal regions for the $3\ell$ channels after applying all selection requirements. The histograms show...

• #### Distribution 6

Data from figure 11b

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Distributions of kinematic variables in the signal regions for the $3\ell$ channels after applying all selection requirements. The histograms show...

• #### Distribution 7

Data from figure 11c

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Distributions of kinematic variables in the signal regions for the $3\ell$ channels after applying all selection requirements. The histograms show...

• #### Distribution 8

Data from figure 11d

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Distributions of kinematic variables in the signal regions for the $3\ell$ channels after applying all selection requirements. The histograms show...

• #### Expected upper limit 1

Expected UL from figure 13a

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Expected exclusion limits at 95% CL on the masses of C1/N2 and N1 from the analysis of 36.1fb$^{-1}$ of 13...

• #### Observed Upper limit 1

Observed UL from figure 13a

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Observed exclusion limits at 95% CL on the masses of C1/N2 and N1 from the analysis of 36.1fb$^{-1}$ of 13...

• #### Expected upper limit 2

Expected UL from figure 13b

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Expected exclusion limits at 95% CL on the masses of C1/N2 and N1 from the analysis of 36.1fb$^{-1}$ of 13...

• #### Observed upper limit 2

Observed UL from figure 13b

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Observed exclusion limits at 95% CL on the masses of C1/N2 and N1 from the analysis of 36.1fb$^{-1}$ of 13...

• #### Expected upper limit 3

Expected UL from figure 13c

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Expected exclusion limits at 95% CL on the masses of C1/N2 and N1 from the analysis of 36.1fb$^{-1}$ of 13...

• #### Observed upper limit 3

Observed UL from figure 13c

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Observed exclusion limits at 95% CL on the masses of C1/N2 and N1 from the analysis of 36.1fb$^{-1}$ of 13...

• #### Signal acceptance 1

Data from auxiliary figure 9a

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Signal region acceptance for chargino-neutralino production in SR2L_High. The acceptance is with respect to all possible $W/Z$ decays.

• #### Signal efficiency 1

Data from auxiliary figure 9b

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Signal region efficiency for chargino-neutralino production in SR2L_High.

• #### Signal acceptanceXefficiency 1

Data from auxiliary figure 9c

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Signal region acceptanceXefficiency for chargino-neutralino production in SR2L_High.

• #### Signal acceptance 2

Data from auxiliary figure 10a

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Signal region acceptance for chargino-neutralino production in SR2L_Int. The acceptance is with respect to all possible $W/Z$ decays.

• #### Signal efficiency 2

Data from auxiliary figure 10b

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Signal region efficiency for chargino-neutralino production in SR2L_Int.

• #### Signal acceptanceXefficiency 2

Data from auxiliary figure 10c

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Signal region acceptanceXefficiency for chargino-neutralino production in SR2L_Int.

• #### Signal acceptance 3

Data from auxiliary figure 11a

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Signal region acceptance for chargino-neutralino production in SR2L_Low. The acceptance is with respect to all possible $W/Z$ decays.

• #### Signal efficiency 3

Data from auxiliary figure 11b

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Signal region efficiency for chargino-neutralino production in SR2L_Low.

• #### Signal acceptanceXefficiency 3

Data from auxiliary figure 11c

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Signal region acceptanceXefficiency for chargino-neutralino production in SR2L_Low.

• #### Signal acceptance 4

Data from auxiliary figure 12a

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Signal region acceptance for chargino-neutralino production in SR2L_ISR. The acceptance is with respect to all possible $W/Z$ decays.

• #### Signal efficiency 4

Data from auxiliary figure 12b

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Signal region efficiency for chargino-neutralino production in SR2L_ISR.

• #### Signal acceptanceXefficiency 4

Data from auxiliary figure 12c

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Signal region acceptanceXefficiency for chargino-neutralino production in SR2L_ISR.

• #### Signal acceptance 5

Data from auxiliary figure 13a

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Signal region acceptance for chargino-neutralino production in SR3L_High. The acceptance is with respect to all possible $W/Z$ decays.

• #### Signal efficiency 5

Data from auxiliary figure 13b

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Signal region efficiency for chargino-neutralino production in SR3L_High.

• #### Signal acceptanceXefficiency 5

Data from auxiliary figure 13c

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Signal region acceptanceXefficiency for chargino-neutralino production in SR3L_High.

• #### Signal acceptance 6

Data from auxiliary figure 14a

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Signal region acceptance for chargino-neutralino production in SR3L_Int. The acceptance is with respect to all possible $W/Z$ decays.

• #### Signal efficiency 6

Data from auxiliary figure 14b

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Signal region efficiency for chargino-neutralino production in SR3L_Int.

• #### Signal acceptanceXefficiency 6

Data from auxiliary figure 14c

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Signal region acceptanceXefficiency for chargino-neutralino production in SR3L_Int.

• #### Signal acceptance 7

Data from auxiliary figure 15a

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Signal region acceptance for chargino-neutralino production in SR3L_Low. The acceptance is with respect to all possible $W/Z$ decays.

• #### Signal efficiency 7

Data from auxiliary figure 15b

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Signal region efficiency for chargino-neutralino production in SR3L_Low.

• #### Signal acceptanceXefficiency 7

Data from auxiliary figure 15c

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Signal region acceptanceXefficiency for chargino-neutralino production in SR3L_Low.

• #### Signal acceptance 8

Data from auxiliary figure 16a

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Signal region acceptance for chargino-neutralino production in SR3L_ISR. The acceptance is with respect to all possible $W/Z$ decays.

• #### Signal efficiency 8

Data from auxiliary figure 16b

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Signal region efficiency for chargino-neutralino production in SR3L_ISR.

• #### Signal acceptanceXefficiency 8

Data from auxiliary figure 16c

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Signal region acceptanceXefficiency for chargino-neutralino production in SR3L_ISR.

• #### Cross-section UL 2L

Data from auxiliary figure 18a

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Observed 95% CL upper limit on the production cross-section of C1/N2 from the analysis of 36.1fb$^{-1}$ of 13 TeV $pp$...

• #### Cross-section UL 3L

Data from auxiliary figure 18b

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Observed 95% CL upper limit on the production cross-section of C1/N2 from the analysis of 36.1fb$^{-1}$ of 13 TeV $pp$...

• #### Cross-section UL combined

Data from figure 18c

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Observed 95% CL upper limit on the production cross-section of C1/N2 from the analysis of 36.1fb$^{-1}$ of 13 TeV $pp$...

• #### Signal cutflow SR2L_High

Data from auxiliary table 1

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Signal cutflow for SR2L_High and m[C1/N2,N1] = [500,0] GeV. 5000 events were generated for this point. The unweighted number of...

• #### Signal cutflow SR2L_Int

Data from auxiliary table 2

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Signal cutflow for SR2L_Int and m[C1/N2,N1] = [400,200] GeV. 10000 events were generated for this point. The unweighted number of...

• #### Signal cutflow SR2L_Low

Data from auxiliary table 3

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Signal cutflow for SR2L_Low and m[C1/N2,N1] = [200,100] GeV. 20000 events were generated for this point. The unweighted number of...

• #### Signal cutflow SR2L_ISR

Data from auxiliary table 4

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Signal cutflow for SR2L_ISR and m[C1/N2,N1] = [200,100] GeV. 20000 events were generated for this point. The unweighted number of...

• #### Signal cutflow SR3L_High

Data from auxiliary table 5

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Signal cutflow for SR3L_High and m[C1/N2,N1] = [500,0] GeV. 5000 events were generated for this point. The unweighted number of...

• #### Signal cutflow SR3L_Int

Data from auxiliary table 6

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Signal cutflow for SR3L_Int and m[C1/N2,N1] = [400,200] GeV. 10000 events were generated for this point. The unweighted number of...

• #### Signal cutflow SR3L_Low

Data from auxiliary table 7

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Signal cutflow for SR3L_Low and m[C1/N2,N1] = [200,100] GeV. 20000 events were generated for this point. The unweighted number of...

• #### Signal cutflow SR3L_ISR

Data from auxiliary table 8

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Signal cutflow for SR3L_ISR and m[C1/N2,N1] = [200,100] GeV. 20000 events were generated for this point. The unweighted number of...