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Search for direct pair production of the top squark in all-hadronic final states in proton-proton collisions at $\sqrt{s}=8$ TeV with the ATLAS detector

The ATLAS collaboration
JHEP 1409 (2014) 015, 2014

Abstract (data abstract)
CERN-LHC. The results of a search for direct pair production of the scalar partner to the top quark using an integrated luminosity of 20.1 fb^{-1} of proton-proton collision data at sqrt(s) = 8 TeV recorded with the ATLAS detector at the LHC are reported. The top squark is assumed to decay via stop --> t chi1^0 or stop --> b chi1^{+/-} --> b W^{(*)} chi1^0, where chi1^0 (chi1^{+/-}) denotes the lightest neutralino (chargino) in supersymmetric models. The search targets a fully-hadronic final state in events with four or more jets and large missing transverse momentum. No significant excess over the Standard Model background prediction is observed, and exclusion limits are reported in terms of the top squark and neutralino masses and as a function of the branching fraction of stop --> t chi1^0. For a branching fraction of 100%, top squark masses in the range 270-645 GeV are excluded for chi1^0 masses below 30 GeV. For a branching fraction of 50% to either stop --> t chi1^0 or stop --> b chi1^{+/-}, and assuming the chi1^{+/-} mass to be twice the chi1^0 mass, top squark masses in the range 250-550 GeV are excluded for chi1^0 masses below 60 GeV.

  • Table 1

    Data from Figure 7a

    10.17182/hepdata.64630.v1/t1

    Etmiss distribution for SRA1 and SRA2 after all selection requirements except those on Etmiss.

  • Table 2

    Data from Figure 7b

    10.17182/hepdata.64630.v1/t2

    Etmiss distribution for SRA3 and SRA4 after all selection requirements except those on Etmiss.

  • Table 3

    Data from Figure 7c

    10.17182/hepdata.64630.v1/t3

    Etmiss distribution for SRB after all selection requirements except those on Etmiss.

  • Table 4

    Data from Figure 7d

    10.17182/hepdata.64630.v1/t4

    Etmiss distribution for SRC1 after all selection requirements except those on Etmiss.

  • Table 5

    Data from Figure 7e

    10.17182/hepdata.64630.v1/t5

    Etmiss distribution for SRC2 after all selection requirements except those on Etmiss.

  • Table 6

    Data from Figure 7f

    10.17182/hepdata.64630.v1/t6

    Etmiss distribution for SRC3 after all selection requirements except those on Etmiss.

  • Table 7

    Data from Figure 8

    10.17182/hepdata.64630.v1/t7

    Observed exclusion limit at 95% CL in the ( M(STOP), M(NEUTRALINO) ) mass plane for the stop pair production scenario.

  • Table 8

    Data from Figure 8

    10.17182/hepdata.64630.v1/t8

    Expected exclusion limit at 95% CL in the ( M(STOP), M(NEUTRALINO) ) mass plane for the stop pair production scenario.

  • Table 9

    Data from Figure 9a

    10.17182/hepdata.64630.v1/t9

    Observed exclusion limit at 95% CL in the ( M(STOP), M(NEUTRALINO) ) mass plane for the stop pair production scenario...

  • Table 10

    Data from Figure 9a

    10.17182/hepdata.64630.v1/t10

    Expected exclusion limit at 95% CL in the ( M(STOP), M(NEUTRALINO) ) mass plane for the stop pair production scenario...

  • Table 11

    Data from Figure 9b

    10.17182/hepdata.64630.v1/t11

    Observed exclusion limit at 95% CL in the ( M(STOP), M(NEUTRALINO) ) mass plane for the stop pair production scenario...

  • Table 12

    Data from Figure 9b

    10.17182/hepdata.64630.v1/t12

    Expected exclusion limit at 95% CL in the ( M(STOP), M(NEUTRALINO) ) mass plane for the stop pair production scenario...

  • Table 13

    Data from Figure 9b

    10.17182/hepdata.64630.v1/t13

    Observed exclusion limit at 95% CL in the ( M(STOP), M(NEUTRALINO) ) mass plane for the stop pair production scenario...

  • Table 14

    Data from Figure 9b

    10.17182/hepdata.64630.v1/t14

    Expected exclusion limit at 95% CL in the ( M(STOP), M(NEUTRALINO) ) mass plane for the stop pair production scenario...

  • Table 15

    Data from Figure 9b

    10.17182/hepdata.64630.v1/t15

    Observed exclusion limit at 95% CL in the ( M(STOP), M(NEUTRALINO) ) mass plane for the stop pair production scenario...

  • Table 16

    Data from Figure 9b

    10.17182/hepdata.64630.v1/t16

    Expected exclusion limit at 95% CL in the ( M(STOP), M(NEUTRALINO) ) mass plane for the stop pair production scenario...

  • Table 17

    Data from Figure 9b

    10.17182/hepdata.64630.v1/t17

    Observed exclusion limit at 95% CL in the ( M(STOP), M(NEUTRALINO) ) mass plane for the stop pair production scenario...

  • Table 18

    Data from Figure 9b

    10.17182/hepdata.64630.v1/t18

    Expected exclusion limit at 95% CL in the ( M(STOP), M(NEUTRALINO) ) mass plane for the stop pair production scenario...

  • Table 19

    Data from Figure 9b

    10.17182/hepdata.64630.v1/t19

    Observed exclusion limit at 95% CL in the ( M(STOP), M(NEUTRALINO) ) mass plane for the stop pair production scenario...

  • Table 20

    Data from Figure 9b

    10.17182/hepdata.64630.v1/t20

    Expected exclusion limit at 95% CL in the ( M(STOP), M(NEUTRALINO) ) mass plane for the stop pair production scenario...

  • Table 21

    Data from Auxiliary Figure 7a

    10.17182/hepdata.64630.v1/t21

    Nominal observed excluded cross sections at 95% CL in the ( M(STOP), M(NEUTRALINO) ) mass plane for the stop pair...

  • Table 22

    Data from Auxiliary Figure 7b

    10.17182/hepdata.64630.v1/t22

    Signal region (SR) combination providing the lowest expected CLs in the ( M(STOP), M(NEUTRALINO) ) mass plane for the stop...

  • Table 23

    Data from Auxiliary Figure 8a

    10.17182/hepdata.64630.v1/t23

    Signal region (SR) combination providing the lowest expected CLs in the ( M(STOP), M(NEUTRALINO) ) mass plane for the stop...

  • Table 24

    Data from Auxiliary Figure 8b

    10.17182/hepdata.64630.v1/t24

    Signal region (SR) combination providing the lowest expected CLs in the ( M(STOP), M(NEUTRALINO) ) mass plane for the stop...

  • Table 25

    Data from Auxiliary Figure 8c

    10.17182/hepdata.64630.v1/t25

    Signal region (SR) combination providing the lowest expected CLs in the ( M(STOP), M(NEUTRALINO) ) mass plane for the stop...

  • Table 26

    Data from Auxiliary Figure 8d

    10.17182/hepdata.64630.v1/t26

    Signal region (SR) combination providing the lowest expected CLs in the ( M(STOP), M(NEUTRALINO) ) mass plane for the stop...

  • Table 27

    Data from Auxiliary Figures 10,13,15

    10.17182/hepdata.64630.v1/t27

    Signal acceptance for the different signal regions (SR) in the ( M(STOP), M(NEUTRALINO) ) mass plane for the stop pair...

  • Table 28

    Data from Auxiliary Figures 11,14,16

    10.17182/hepdata.64630.v1/t28

    Signal efficiency for the different signal regions (SR) in the ( M(STOP), M(NEUTRALINO) ) mass plane for the stop pair...

  • Table 29

    Data from Auxiliary Figure 17

    10.17182/hepdata.64630.v1/t29

    Signal acceptance for the different signal regions (SR) in the ( M(STOP), M(NEUTRALINO) ) mass plane for the stop pair...

  • Table 30

    Data from Auxiliary Figure 18

    10.17182/hepdata.64630.v1/t30

    Signal efficiency for the different signal regions (SR) in the ( M(STOP), M(NEUTRALINO) ) mass plane for the stop pair...

  • Table 31

    Data from Auxiliary Figure 21a

    10.17182/hepdata.64630.v1/t31

    Number of generated Monte Carlo events in the ( M(STOP), M(NEUTRALINO) ) mass plane for the stop pair production scenario...

  • Table 32

    Data from Auxiliary Figure 21b

    10.17182/hepdata.64630.v1/t32

    Number of generated Monte Carlo events in the ( M(STOP), M(NEUTRALINO) ) mass plane in the stop pair production scenario...

  • Table 33

    Data from Auxiliary Figure 21c

    10.17182/hepdata.64630.v1/t33

    Stop signal production cross sections in the ( M(STOP), M(NEUTRALINO) ) mass plane.

  • Table 34

    Data from Auxiliary Figure 12a

    10.17182/hepdata.64630.v1/t34

    Total experimental systematic uncertainty in percent on the signal yield for SRA1 in the ( M(STOP), M(NEUTRALINO) ) mass plane...

  • Table 35

    Data from Auxiliary Figure 12b

    10.17182/hepdata.64630.v1/t35

    Total experimental systematic uncertainty in percent on the signal yield for SRA2 in the ( M(STOP), M(NEUTRALINO) ) mass plane...

  • Table 36

    Data from Auxiliary Figure 12c

    10.17182/hepdata.64630.v1/t36

    Total experimental systematic uncertainty in percent on the signal yield for SRA3 in the ( M(STOP), M(NEUTRALINO) ) mass plane...

  • Table 37

    Data from Auxiliary Figure 12d

    10.17182/hepdata.64630.v1/t37

    Total experimental systematic uncertainty in percent on the signal yield for SRA4 in the ( M(STOP), M(NEUTRALINO) ) mass plane...

  • Table 38

    Data from Auxiliary Figure 19a

    10.17182/hepdata.64630.v1/t38

    Total experimental systematic uncertainty in percent on the signal yield for SRB in the ( M(STOP), M(NEUTRALINO) ) mass plane...

  • Table 39

    Data from Auxiliary Figure 19b

    10.17182/hepdata.64630.v1/t39

    Total experimental systematic uncertainty in percent on the signal yield for SRC1 in the ( M(STOP), M(NEUTRALINO) ) mass plane...

  • Table 40

    Data from Auxiliary Figure 19c

    10.17182/hepdata.64630.v1/t40

    Total experimental systematic uncertainty in percent on the signal yield for SRC2 in the ( M(STOP), M(NEUTRALINO) ) mass plane...

  • Table 41

    Data from Auxiliary Figure 19d

    10.17182/hepdata.64630.v1/t41

    Total experimental systematic uncertainty in percent on the signal yield for SRC3 in the ( M(STOP), M(NEUTRALINO) ) mass plane...

  • Table 42

    Data from Auxiliary Figure 22

    10.17182/hepdata.64630.v1/t42

    Observed and expected CLs in the ( M(STOP), M(NEUTRALINO) ) mass plane for the stop pair production scenario. The value...

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