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Search for the electroweak production of supersymmetric particles in $\sqrt{s}$=8 TeV $pp$ collisions with the ATLAS detector

The ATLAS collaboration
Phys.Rev. D93 (2016) 052002, 2016

Abstract (data abstract)
The ATLAS experiment has performed extensive searches for the electroweak production of charginos, neutralinos and staus. This article summarizes and extends the search for electroweak supersymmetry with new analyses targeting scenarios not covered by previously published searches. New searches use vector-boson fusion production, initial-state radiation jets, and low-momentum lepton final states, as well as multivariate analysis techniques to improve the sensitivity to scenarios with small mass splittings and low-production cross-sections. Results are based on 20 fb$^{-1}$ of proton--proton collision data at $\sqrt{s}$=8 TeV recorded with the ATLAS experiment at the Large Hadron Collider. No significant excess beyond Standard Model expectations is observed. The new and existing searches are combined and interpreted in terms of 95% confidence-level exclusion limits in simplified models, where a single production process and decay mode is assumed, as well as within phenomenological supersymmetric models.

  • Table 1

    Data from Figure 3a

    10.17182/hepdata.69537.v1/t1

    The missing transverse momentum ETmiss in the multi-jet validation region VR1 for the two-tau MVA analysis.

  • Table 2

    Data from Figure 3b

    10.17182/hepdata.69537.v1/t2

    The effective mass meff in the multi-jet validation region VR2 for the two-tau MVA analysis.

  • Table 3

    Data from Figure 3c

    10.17182/hepdata.69537.v1/t3

    The stransverse mass mT2 in the W+jets validation region VR1 for the two-tau MVA analysis.

  • Table 4

    Data from Figure 3d

    10.17182/hepdata.69537.v1/t4

    The stransverse mass mT2 in the W+jets validation region VR2 for the two-tau MVA analysis.

  • Table 5

    Data from Figure 4a

    10.17182/hepdata.69537.v1/t5

    The BDT response prior to applying the SR BDT requirement for the two-tau MVA analysis.

  • Table 6

    Data from Figure 4b

    10.17182/hepdata.69537.v1/t6

    The missing transverse energy ETmiss in the two-tau MVA signal region.

  • Table 7

    Data from Figure 4c

    10.17182/hepdata.69537.v1/t7

    The effective mass meff in the two-tau MVA signal region.

  • Table 8

    Data from Figure 4d

    10.17182/hepdata.69537.v1/t8

    The stransverse mass mT2 in the two-tau MVA signal region.

  • Table 9

    Data from Figure 6a

    10.17182/hepdata.69537.v1/t9

    The ratio R2 in the signal region SR2l-1a SF from the two-lepton, opposite-sign analysis, prior to the requirement on this...

  • Table 10

    Data from Figure 6b

    10.17182/hepdata.69537.v1/t10

    The ratio R2 in the signal region SR2l-1a DF from the two-lepton, opposite-sign analysis, prior to the requirement on this...

  • Table 11

    Data from Figure 6c

    10.17182/hepdata.69537.v1/t11

    The super razor quantity MdR in the signal region SR2l-1b SF from the two-lepton, opposite-sign analysis, prior to the requirement...

  • Table 12

    Data from Figure 6d

    10.17182/hepdata.69537.v1/t12

    The super razor quantity MdR in the signal region SR2l-1b DF from the two-lepton, opposite-sign analysis, prior to the requirement...

  • Table 13

    Data from Figure 7a

    10.17182/hepdata.69537.v1/t13

    The separation in phi between the leading jet and the missing transverse momentum dPhi(jet 1,ETmiss) in the ISR validation region...

  • Table 14

    Data from Figure 7b

    10.17182/hepdata.69537.v1/t14

    The transverse mass using the leading lepton mTlep1 in the ISR validation region of the two-lepton, same-sign MVA analysis.

  • Table 15

    Data from Figure 7c

    10.17182/hepdata.69537.v1/t15

    The transverse mass using the second leading lepton mTlep2 in the no-ISR validation region of the two-lepton, same-sign MVA analysis.

  • Table 16

    Data from Figure 7d

    10.17182/hepdata.69537.v1/t16

    The scalar sum of the pT of the leptons and jets, HT in the no-ISR validation region of the two-lepton,...

  • Table 17

    Data from Figure 8a

    10.17182/hepdata.69537.v1/t17

    The three-lepton invariant mass mlll in the validation region VR3l-0a from the three-lepton analysis.

  • Table 18

    Data from Figure 8b

    10.17182/hepdata.69537.v1/t18

    The missing transverse energy ETmiss in the validation region VR3l-0b from the three-lepton analysis.

  • Table 19

    Data from Figure 8c

    10.17182/hepdata.69537.v1/t19

    The transverse momentum of the leading jet pTjet1 in the validation region VR3l-1a from the three-lepton analysis.

  • Table 20

    Data from Figure 8d

    10.17182/hepdata.69537.v1/t20

    The missing transverse energy ETmiss in the validation region VR3l-1b from the three-lepton analysis.

  • Table 21

    Data from Figure 9a

    10.17182/hepdata.69537.v1/t21

    The missing transverse energy ETmiss in the signal region SR3l-0a from the three-lepton analysis.

  • Table 22

    Data from Figure 9b

    10.17182/hepdata.69537.v1/t22

    The three-lepton invariant mass mlll in the signal region SR3l-0b from the three-lepton analysis.

  • Table 23

    Data from Figure 9c

    10.17182/hepdata.69537.v1/t23

    The separation in phi between the leading jet and the missing transverse momentum dPhi(jet 1,ETmiss) in the signal region SR3l-1a...

  • Table 24

    Data from Figure 9d

    10.17182/hepdata.69537.v1/t24

    The transverse momentum of the leading jet pTjet1 in the signal region SR3l-1b from the three-lepton analysis.

  • Table 25

    Data from Figure 10a

    10.17182/hepdata.69537.v1/t25

    The transverse momentum of the second leading jet pTjet2 in the VV validation region from the same-sign two-lepton VBF analysis.

  • Table 26

    Data from Figure 10b

    10.17182/hepdata.69537.v1/t26

    The invariant mass of the two leading jets mjj in the VV validation region from the same-sign two-lepton VBF analysis.

  • Table 27

    Data from Figure 10c

    10.17182/hepdata.69537.v1/t27

    The transverse momentum of the second leading lepton pTlep2 in the Fakes validation region from the same-sign two-lepton VBF analysis.

  • Table 28

    Data from Figure 10d

    10.17182/hepdata.69537.v1/t28

    The missing transverse momentum ETmiss in the Fakes validation region from the same-sign two-lepton VBF analysis.

  • Table 29

    Data from Figure 11a

    10.17182/hepdata.69537.v1/t29

    The invariant mass of the two leading jets mjj in the same-sign, two lepton VBF signal region.

  • Table 30

    Data from Figure 11b

    10.17182/hepdata.69537.v1/t30

    The separation in eta between the two leading jets dEtajj in the same-sign, two lepton VBF signal region.

  • Table 31

    Data from Figure 11c

    10.17182/hepdata.69537.v1/t31

    The missing transverse energy ETmiss in the same-sign, two lepton VBF signal region.

  • Table 32

    Data from Figure 11d

    10.17182/hepdata.69537.v1/t32

    The transverse momentum of the second leading lepton pTlep2 in the same-sign, two lepton VBF signal region.

  • Table 33

    Data from Figure 12

    10.17182/hepdata.69537.v1/t33

    The 95% CL exclusion limits (expected and observed) on the cross-section for production of left- and right-handed stau pairs for...

  • Table 34

    Data from Figure 13a

    10.17182/hepdata.69537.v1/t34

    The 95% CL exclusion limits (expected and observed) on the cross-section for CHARGINO1+ CHARGINO1- production with SLEPTONL-mediated decays, where the...

  • Table 35

    Data from Figure 13b

    10.17182/hepdata.69537.v1/t35

    The expected 95% CL exclusion limits for CHARGINO1+ CHARGINO1- production with SLEPTONL-mediated decays as a function of the CHARGINO1+- and...

  • Table 36

    Data from Figure 13b

    10.17182/hepdata.69537.v1/t36

    The observed 95% CL exclusion limits for CHARGINO1+ CHARGINO1- production with SLEPTONL-mediated decays as a function of the CHARGINO1+- and...

  • Table 37

    Data from Figure 14a

    10.17182/hepdata.69537.v1/t37

    The expected and observed 95% CL exclusion limits on the cross-section for VBF CHARGINO1+-CHARGINO1+- production, as a function of the...

  • Table 38

    Data from Figure 15a

    10.17182/hepdata.69537.v1/t38

    The 95% CL exclusion limits (expected and observed) on the cross-section for NEUTRALINO2 NEUTRALINO3 production with SLEPTONR-mediated decays, where the...

  • Table 39

    Data from Figure 15b

    10.17182/hepdata.69537.v1/t39

    The expected 95% CL exclusion limits for NEUTRALINO2 NEUTRALINO3 production with SLEPTONR-mediated decays as a function of the NEUTRALINO2 and...

  • Table 40

    Data from Figure 15b

    10.17182/hepdata.69537.v1/t40

    The observed 95% CL exclusion limits for NEUTRALINO2 NEUTRALINO3 production with SLEPTONR-mediated decays as a function of the NEUTRALINO2 and...

  • Table 41

    Data from Figure 16

    10.17182/hepdata.69537.v1/t41

    The 95% CL exclusion limits (expected and observed) on the cross-section for CHARGINO1+- NEUTRALINO2 production with SLEPTONL-mediated decays, where the...

  • Table 42

    Data from Figure 17a

    10.17182/hepdata.69537.v1/t42

    The expected 95% CL exclusion limits for CHARGINO1+-NEUTRALINO2 production with SLEPTONL-mediated decays (x=0.50) as a function of the NEUTRALINO2 and...

  • Table 43

    Data from Figure 17a

    10.17182/hepdata.69537.v1/t43

    The observed 95% CL exclusion limits for CHARGINO1+-NEUTRALINO2 production with SLEPTONL-mediated decays (x=0.50) as a function of the NEUTRALINO2 and...

  • Table 44

    Data from Figure 17b

    10.17182/hepdata.69537.v1/t44

    The expected 95% CL exclusion limits for CHARGINO1+-NEUTRALINO2 production with SLEPTONL-mediated decays (x=0.95) as a function of the NEUTRALINO2 and...

  • Table 45

    Data from Figure 17b

    10.17182/hepdata.69537.v1/t45

    The observed 95% CL exclusion limits for CHARGINO1+-NEUTRALINO2 production with SLEPTONL-mediated decays (x=0.95) as a function of the NEUTRALINO2 and...

  • Table 46

    Data from Figure 18

    10.17182/hepdata.69537.v1/t46

    The expected 95% CL exclusion limits for CHARGINO1+-NEUTRALINO2 production with STAU-mediated decays as a function of the NEUTRALINO2 and NEUTRALINO1...

  • Table 47

    Data from Figure 18

    10.17182/hepdata.69537.v1/t47

    The observed 95% CL exclusion limits for CHARGINO1+-NEUTRALINO2 production with STAU-mediated decays as a function of the NEUTRALINO2 and NEUTRALINO1...

  • Table 48

    Data from Figure 20

    10.17182/hepdata.69537.v1/t48

    The expected 95% CL exclusion limits in the pMSSM scenario.

  • Table 49

    Data from Figure 20

    10.17182/hepdata.69537.v1/t49

    The observed 95% CL exclusion limits in the pMSSM scenario.

  • Table 50

    Data from Figure 21

    10.17182/hepdata.69537.v1/t50

    The expected 95% CL exclusion limits in the NUHM2 scenario.

  • Table 51

    Data from Figure 21

    10.17182/hepdata.69537.v1/t51

    The observed 95% CL exclusion limits in the NUHM2 scenario.

  • Table 52

    Data from Figure 22

    10.17182/hepdata.69537.v1/t52

    The expected 95% CL exclusion limits in the GMSB scenario.

  • Table 53

    Data from Figure 22

    10.17182/hepdata.69537.v1/t53

    The observed 95% CL exclusion limits in the GMSB scenario.

  • Table 54

    Data from Auxiliary Figure 1a

    10.17182/hepdata.69537.v1/t54

    The best expected signal region in the direct STAUL STAUL SUSY model, where "1" indicates the two-tau MVA signal region...

  • Table 55

    Data from Auxiliary Figure 1b

    10.17182/hepdata.69537.v1/t55

    The number of generated events in the direct STAUL STAUL SUSY model.

  • Table 56

    Data from Auxiliary Figure 1c

    10.17182/hepdata.69537.v1/t56

    The cross-section in the direct STAUL STAUL SUSY model.

  • Table 57

    Data from Auxiliary Figure 1d

    10.17182/hepdata.69537.v1/t57

    The experimental uncertainty in the two-tau MVA signal region in the direct STAUL STAUL SUSY model.

  • Table 58

    Data from Auxiliary Figure 1e

    10.17182/hepdata.69537.v1/t58

    The expected CLs in the two-tau MVA signal region in the direct STAUL STAUL SUSY model.

  • Table 59

    Data from Auxiliary Figure 1f

    10.17182/hepdata.69537.v1/t59

    The observed CLs in the two-tau MVA signal region in the direct STAUL STAUL SUSY model.

  • Table 60

    Data from Auxiliary Figure 2a

    10.17182/hepdata.69537.v1/t60

    The 95% CL upper limit on the SUSY cross-section in the CHARGINO1+CHARGINO1- SUSY model using the opposite-sign, two-lepton analysis.

  • Table 61

    Data from Auxiliary Figure 2b

    10.17182/hepdata.69537.v1/t61

    The best expected signal region in the CHARGINO1+CHARGINO1- SUSY model using the opposite-sign, two-lepton analysis, where "1" denotes SR2l-1a and...

  • Table 62

    Data from Auxiliary Figure 2c

    10.17182/hepdata.69537.v1/t62

    The number of generated events in the CHARGINO1+CHARGINO1- SUSY model.

  • Table 63

    Data from Auxiliary Figure 2d

    10.17182/hepdata.69537.v1/t63

    The total cross-section in the CHARGINO1+CHARGINO1- SUSY model.

  • Table 64

    Data from Auxiliary Figure 2e

    10.17182/hepdata.69537.v1/t64

    The acceptance for the opposite-sign, two-lepton signal region SR2l-1b in the CHARGINO1+CHARGINO1- SUSY model.

  • Table 65

    Data from Auxiliary Figure 2f

    10.17182/hepdata.69537.v1/t65

    The efficiency for the opposite-sign, two-lepton signal region SR2l-1b in the CHARGINO1+CHARGINO1- SUSY model.

  • Table 66

    Data from Auxiliary Figure 2g

    10.17182/hepdata.69537.v1/t66

    The experimental uncertainty for the opposite-sign, two-lepton signal region SR2l-1b in the CHARGINO1+CHARGINO1- SUSY model.

  • Table 67

    Data from Auxiliary Figure 2h

    10.17182/hepdata.69537.v1/t67

    The expected CLs for the opposite-sign, two-lepton signal region SR2l-1b in the CHARGINO1+CHARGINO1- SUSY model.

  • Table 68

    Data from Auxiliary Figure 2i

    10.17182/hepdata.69537.v1/t68

    The observed CLs for the opposite-sign, two-lepton signal region SR2l-1b in the CHARGINO1+CHARGINO1- SUSY model.

  • Table 69

    Data from Auxiliary Figure 3a

    10.17182/hepdata.69537.v1/t69

    The number of generated events in the VBF CHARGINO1+- CHARGINO1+- VBF SUSY model, where m(CHARGINO1+-)=m(NEUTRALINO2) and x=0.5.

  • Table 70

    Data from Auxiliary Figure 3b

    10.17182/hepdata.69537.v1/t70

    The total cross-section in the VBF CHARGINO1+- CHARGINO1+- SUSY model, where m(CHARGINO1+-)=m(NEUTRALINO2) and x=0.5.

  • Table 71

    Data from Auxiliary Figure 3c

    10.17182/hepdata.69537.v1/t71

    The acceptance for the same-sign, two-lepton VBF signal region in the VBF CHARGINO1+- CHARGINO1+- SUSY model, where m(CHARGINO1+-)=m(NEUTRALINO2) and x=0.5.

  • Table 72

    Data from Auxiliary Figure 3d

    10.17182/hepdata.69537.v1/t72

    The efficiency for the same-sign, two-lepton VBF signal region in the VBF CHARGINO1+- CHARGINO1+- SUSY model, where m(CHARGINO1+-)=m(NEUTRALINO2) and x=0.5.

  • Table 73

    Data from Auxiliary Figure 3e

    10.17182/hepdata.69537.v1/t73

    The experimental uncertainty for the same-sign, two-lepton VBF signal region in the VBF CHARGINO1+- CHARGINO1+- SUSY model, where m(CHARGINO1+-)=m(NEUTRALINO2) and...

  • Table 74

    Data from Auxiliary Figure 3f

    10.17182/hepdata.69537.v1/t74

    The expected CLs for the same-sign, two-lepton VBF signal region in the VBF CHARGINO1+- CHARGINO1+- SUSY model, where m(CHARGINO1+-)=m(NEUTRALINO2) and...

  • Table 75

    Data from Auxiliary Figure 3f

    10.17182/hepdata.69537.v1/t75

    The observed CLs for the same-sign, two-lepton VBF signal region in the VBF CHARGINO1+- CHARGINO1+- SUSY model, where m(CHARGINO1+-)=m(NEUTRALINO2) and...

  • Table 76

    Data from Auxiliary Figure 4b

    10.17182/hepdata.69537.v1/t76

    The best expected signal region in the same-sign, two-lepton MVA analysis for the CHARGINO1+-NEUTRALINO2 SUSY model (x=0.5), where "1" indicates...

  • Table 77

    Data from Auxiliary Figure 4c

    10.17182/hepdata.69537.v1/t77

    The number of generated events in the CHARGINO1+-NEUTRALINO2 SUSY model (x=0.5).

  • Table 78

    Data from Auxiliary Figure 4d

    10.17182/hepdata.69537.v1/t78

    The total cross-section in the CHARGINO1+-NEUTRALINO2 SUSY model (x=0.5).

  • Table 79

    Data from Auxiliary Figure 5a

    10.17182/hepdata.69537.v1/t79

    The experimental uncertainty in the same-sign, two-lepton MVA signal region SR dM20 for the CHARGINO1+-NEUTRALINO2 SUSY model (x=0.5).

  • Table 80

    Data from Auxiliary Figure 5b

    10.17182/hepdata.69537.v1/t80

    The expected CLs in the same-sign, two-lepton MVA signal region SR dM20 for the CHARGINO1+-NEUTRALINO2 SUSY model (x=0.5).

  • Table 81

    Data from Auxiliary Figure 5c

    10.17182/hepdata.69537.v1/t81

    The observed CLs in the same-sign, two-lepton MVA signal region SR dM20 for the CHARGINO1+-NEUTRALINO2 SUSY model (x=0.5).

  • Table 82

    Data from Auxiliary Figure 6a

    10.17182/hepdata.69537.v1/t82

    The acceptance in the three-lepton signal region SR3l-1b for the CHARGINO1+-NEUTRALINO2 SUSY model (x=0.5).

  • Table 83

    Data from Auxiliary Figure 6a

    10.17182/hepdata.69537.v1/t83

    The efficiency in the three-lepton signal region SR3l-1b for the CHARGINO1+-NEUTRALINO2 SUSY model (x=0.5).

  • Table 84

    Data from Auxiliary Figure 6c

    10.17182/hepdata.69537.v1/t84

    The experimental uncertainty in the three-lepton signal region SR3l-1b for the CHARGINO1+-NEUTRALINO2 SUSY model (x=0.5).

  • Table 85

    Data from Auxiliary Figure 6d

    10.17182/hepdata.69537.v1/t85

    The expected CLs in the three-lepton signal region SR3l-1b for the CHARGINO1+-NEUTRALINO2 SUSY model (x=0.5).

  • Table 86

    Data from Auxiliary Figure 6e

    10.17182/hepdata.69537.v1/t86

    The observed CLs in the three-lepton signal region SR3l-1b for the CHARGINO1+-NEUTRALINO2 SUSY model (x=0.5).

  • Table 87

    Data from Auxiliary Figure 7b

    10.17182/hepdata.69537.v1/t87

    The best expected signal region in the same-sign, two-lepton MVA analysis for the CHARGINO1+-NEUTRALINO2 SUSY model (x=0.95), where "1" indicates...

  • Table 88

    Data from Auxiliary Figure 8

    10.17182/hepdata.69537.v1/t88

    The 95% CL upper limit on the SUSY cross-section in the CHARGINO1+-NEUTRALINO2 SUSY model with STAU-mediated decays.

  • Table 89

    Data from Auxiliary Figure 9

    10.17182/hepdata.69537.v1/t89

    The 95% CL upper limit on the SUSY cross-section in the NEUTRALINO2 NEUTRALINO3 SUSY model.

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