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Search for direct third-generation squark pair production in final states with missing transverse momentum and two $b$-jets in $\sqrt{s} =$ 8 TeV $pp$ collisions with the ATLAS detector

The ATLAS collaboration
JHEP 1310 (2013) 189, 2013

Abstract (data abstract)
CERN-LHC. The results of a search for pair production of supersymmetric partners of the Standard Model third-generation quarks are reported. This search uses 20.1 fb^-1 of pp collisions at sqrt(s) = 8 TeV collected during the period from March to December 2012 by the ATLAS experiment at the Large Hadron Collider. The lightest bottom and top squarks (b1 and t1 respectively) are searched for in a final state with large missing transverse momentum and two jets identified as originating from b-quarks. No excess of events above the expected level of Standard Model background is found. The results are used to set upper limits on the visible cross section for processes beyond the Standard Model. Exclusion limits at the 95% confidence level on the masses of the third-generation squarks are derived in phenomenological supersymmetric R-parity-conserving models in which either the bottom or the top squark is the lightest squark. The b1 is assumed to decay via b1 --> b chi1^0 (where chi1^0 is the lightest neutralino) and the t1 via t1 --> b chi1^{+/-} (where chi1^{+/-} is the lightest chargino), with undetectable products of the subsequent decay of the chi1^{+/-} due to the small mass splitting between the chi1^{+/-} and the chi1^0.

  • Table 1

    Data from Figure 5

    10.17182/hepdata.62446.v1/t1

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

  • Table 2

    Data from Figure 5

    10.17182/hepdata.62446.v1/t2

    Observed exclusion limit at 95% CL, when moving the nominal signal cross section up by the 1-sigma theoretical uncertainty, in...

  • Table 3

    Data from Figure 5

    10.17182/hepdata.62446.v1/t3

    Observed exclusion limit at 95% CL, when moving the nominal signal cross section down by the 1-sigma theoretical uncertainty, in...

  • Table 4

    Data from Figure 5

    10.17182/hepdata.62446.v1/t4

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

  • Table 5

    Data from Figure 5

    10.17182/hepdata.62446.v1/t5

    Upper 1-sigma expected exclusion limit at 95% CL in the ( M(SBOTTOM), M(NEUTRALINO) ) mass plane for the sbottom pair...

  • Table 6

    Data from Figure 5

    10.17182/hepdata.62446.v1/t6

    Lower 1-sigma expected exclusion limit at 95% CL in the ( M(SBOTTOM), M(NEUTRALINO) ) mass plane for the sbottom pair...

  • Table 7

    Data from Figure 6A

    10.17182/hepdata.62446.v1/t7

    Observed exclusion limit at 95% CL in the ( M(CHARGINO), M(NEUTRALINO) ) mass plane with M(STOP) = 300 GEV for...

  • Table 8

    Data from Figure 6A

    10.17182/hepdata.62446.v1/t8

    Observed exclusion limit at 95% CL, when moving the nominal signal cross section up by the 1-sigma theoretical uncertainty, in...

  • Table 9

    Data from Figure 6A

    10.17182/hepdata.62446.v1/t9

    Observed exclusion limit at 95% CL, when moving the nominal signal cross section down by the 1-sigma theoretical uncertainty, in...

  • Table 10

    Data from Figure 6A

    10.17182/hepdata.62446.v1/t10

    Expected exclusion limit at 95% CL in the ( M(CHARGINO), M(NEUTRALINO) ) mass plane with M(STOP) = 300 GEV for...

  • Table 11

    Data from Figure 6A

    10.17182/hepdata.62446.v1/t11

    Upper 1-sigma expected exclusion limit at 95% CL in the ( M(CHARGINO), M(NEUTRALINO) ) mass plane with M(STOP) = 300...

  • Table 12

    Data from Figure 6A

    10.17182/hepdata.62446.v1/t12

    Lower 1-sigma expected exclusion limit at 95% CL in the ( M(CHARGINO), M(NEUTRALINO) ) mass plane with M(STOP) = 300...

  • Table 13

    Data from Figure 6B

    10.17182/hepdata.62446.v1/t13

    Observed exclusion limit at 95% CL in the ( M(STOP), M(NEUTRALINO) ) mass plane with M(CHARGINO) = 150 GEV for...

  • Table 14

    Data from Figure 6B

    10.17182/hepdata.62446.v1/t14

    Observed exclusion limit at 95% CL, when moving the nominal signal cross section up by the 1-sigma theoretical uncertainty, in...

  • Table 15

    Data from Figure 6B

    10.17182/hepdata.62446.v1/t15

    Observed exclusion limit at 95% CL, when moving the nominal signal cross section down by the 1-sigma theoretical uncertainty, in...

  • Table 16

    Data from Figure 6B

    10.17182/hepdata.62446.v1/t16

    Expected exclusion limit at 95% CL in the ( M(STOP), M(NEUTRALINO) ) mass plane with M(CHARGINO) = 150 GEV for...

  • Table 17

    Data from Figure 6B

    10.17182/hepdata.62446.v1/t17

    Upper 1-sigma expected exclusion limit at 95% CL in the ( M(STOP), M(NEUTRALINO) ) mass plane with M(CHARGINO) = 150...

  • Table 18

    Data from Figure 6B

    10.17182/hepdata.62446.v1/t18

    Lower 1-sigma expected exclusion limit at 95% CL in the ( M(STOP), M(NEUTRALINO) ) mass plane with M(CHARGINO) = 150...

  • Table 19

    Data from Figure 6C

    10.17182/hepdata.62446.v1/t19

    Observed exclusion limit at 95% CL in the ( M(STOP), M(NEUTRALINO) ) mass plane with M(CHARGINO)-M(NEUTRALINO) = 5 GEV for...

  • Table 20

    Data from Figure 6C

    10.17182/hepdata.62446.v1/t20

    Observed exclusion limit at 95% CL, when moving the nominal signal cross section up by the 1-sigma theoretical uncertainty, in...

  • Table 21

    Data from Figure 6C

    10.17182/hepdata.62446.v1/t21

    Observed exclusion limit at 95% CL, when moving the nominal signal cross section down by the 1-sigma theoretical uncertainty, in...

  • Table 22

    Data from Figure 6C

    10.17182/hepdata.62446.v1/t22

    Expected exclusion limit at 95% CL in the ( M(STOP), M(NEUTRALINO) ) mass plane with M(CHARGINO)-M(NEUTRALINO) = 5 GEV for...

  • Table 23

    Data from Figure 6C

    10.17182/hepdata.62446.v1/t23

    Upper 1-sigma expected exclusion limit at 95% CL in the ( M(STOP), M(NEUTRALINO) ) mass plane with M(CHARGINO)-M(NEUTRALINO) = 5...

  • Table 24

    Data from Figure 6C

    10.17182/hepdata.62446.v1/t24

    Lower 1-sigma expected exclusion limit at 95% CL in the ( M(STOP), M(NEUTRALINO) ) mass plane with M(CHARGINO)-M(NEUTRALINO) = 5...

  • Table 25

    Data from Figure 6D

    10.17182/hepdata.62446.v1/t25

    Observed exclusion limit at 95% CL in the ( M(STOP), M(NEUTRALINO) ) mass plane with M(CHARGINO)-M(NEUTRALINO) = 20 GEV for...

  • Table 26

    Data from Figure 6D

    10.17182/hepdata.62446.v1/t26

    Observed exclusion limit at 95% CL, when moving the nominal signal cross section up by the 1-sigma theoretical uncertainty, in...

  • Table 27

    Data from Figure 6D

    10.17182/hepdata.62446.v1/t27

    Observed exclusion limit at 95% CL, when moving the nominal signal cross section down by the 1-sigma theoretical uncertainty, in...

  • Table 28

    Data from Figure 6D

    10.17182/hepdata.62446.v1/t28

    Expected exclusion limit at 95% CL in the ( M(STOP), M(NEUTRALINO) ) mass plane with M(CHARGINO)-M(NEUTRALINO) = 20 GEV for...

  • Table 29

    Data from Figure 6D

    10.17182/hepdata.62446.v1/t29

    Upper 1-sigma expected exclusion limit at 95% CL in the ( M(STOP), M(NEUTRALINO) ) mass plane with M(CHARGINO)-M(NEUTRALINO) = 20...

  • Table 30

    Data from Figure 6D

    10.17182/hepdata.62446.v1/t30

    Lower 1-sigma expected exclusion limit at 95% CL in the ( M(STOP), M(NEUTRALINO) ) mass plane with M(CHARGINO)-M(NEUTRALINO) = 20...

  • Table 31

    Data from Auxiliary Figure 3

    10.17182/hepdata.62446.v1/t31

    Signal region (SR) providing the best expected sensitivity in the ( M(SBOTTOM), M(NEUTRALINO) ) mass plane for the sbottom pair...

  • Table 32

    Data from Auxiliary Figure 4

    10.17182/hepdata.62446.v1/t32

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

  • Table 33

    Data from Auxiliary Figure 5

    10.17182/hepdata.62446.v1/t33

    Impact of reducing the branching ratios of SBOTTOM --> BOTTOM NEUTRALINO, assuming no sensitivity to the other decay possibilities, in...

  • Table 34

    Data from Auxiliary Figure 6A

    10.17182/hepdata.62446.v1/t34

    Signal region (SR) providing the best expected sensitivity in the ( M(STOP), M(NEUTRALINO) ) mass plane with M(CHARGINO)-M(NEUTRALINO) = 5...

  • Table 35

    Data from Auxiliary Figure 6B

    10.17182/hepdata.62446.v1/t35

    Signal region (SR) providing the best expected sensitivity in the ( M(STOP), M(NEUTRALINO) ) mass plane with M(CHARGINO)-M(NEUTRALINO) = 20...

  • Table 36

    Data from Auxiliary Figure 7

    10.17182/hepdata.62446.v1/t36

    Signal region (SR) providing the best expected sensitivity in the ( M(CHARGINO), M(NEUTRALINO) ) mass plane with M(STOP) = 300...

  • Table 37

    Data from Auxiliary Figure 8A

    10.17182/hepdata.62446.v1/t37

    Nominal observed excluded cross sections at 95% CL in the ( M(STOP), M(NEUTRALINO) ) mass plane with M(CHARGINO)-M(NEUTRALINO) = 5...

  • Table 38

    Data from Auxiliary Figure 8B

    10.17182/hepdata.62446.v1/t38

    Nominal observed excluded cross sections at 95% CL in the ( M(STOP), M(NEUTRALINO) ) mass plane with M(CHARGINO)-M(NEUTRALINO) = 20...

  • Table 39

    Data from Auxiliary Figure 9

    10.17182/hepdata.62446.v1/t39

    Nominal observed excluded cross sections at 95% CL in the ( M(CHARGINO), M(NEUTRALINO) ) mass plane with M(STOP) = 300...

  • Table 40

    Data from Auxiliary Figure 11A

    10.17182/hepdata.62446.v1/t40

    Expected CLs values in the ( M(SBOTTOM), M(NEUTRALINO) ) mass plane for the sbottom pair production scenario.

  • Table 41

    Data from Auxiliary Figure 11B

    10.17182/hepdata.62446.v1/t41

    Observed CLs values in the ( M(SBOTTOM), M(NEUTRALINO) ) mass plane for the sbottom pair production scenario.

  • Table 42

    Data from Auxiliary Figure 12A

    10.17182/hepdata.62446.v1/t42

    Sbottom signal production cross sections in the ( M(SBOTTOM), M(NEUTRALINO) ) mass plane. These values are also used for the...

  • Table 43

    Data from Auxiliary Figure 12B

    10.17182/hepdata.62446.v1/t43

    Relative theoretical uncertainties in percent on the sbottom signal production cross sections in the ( M(SBOTTOM), M(NEUTRALINO) ) mass plane...

  • Table 44

    Data from Auxiliary Figure 13

    10.17182/hepdata.62446.v1/t44

    Total number of generated MC events for the sbottom signal grid in the ( M(SBOTTOM), M(NEUTRALINO) ) mass plane.

  • Table 45

    Data from Auxiliary Figure 14

    10.17182/hepdata.62446.v1/t45

    Signal acceptance in the ( M(SBOTTOM), M(NEUTRALINO) ) mass plane for the sbottom pair production scenario. The best expected signal...

  • Table 46

    Data from Auxiliary Figure 15

    10.17182/hepdata.62446.v1/t46

    Signal efficiency times acceptance in the ( M(SBOTTOM), M(NEUTRALINO) ) mass plane for the sbottom pair production scenario. The best...

  • Table 47

    Data from Auxiliary Figure 16A

    10.17182/hepdata.62446.v1/t47

    Total experimental systematic uncertainty in percent on the signal efficiency times acceptance in the ( M(SBOTTOM), M(NEUTRALINO) ) mass plane...

  • Table 48

    Data from Auxiliary Figure 16B

    10.17182/hepdata.62446.v1/t48

    Total experimental systematic uncertainty in percent on the signal efficiency times acceptance in the ( M(SBOTTOM), M(NEUTRALINO) ) mass plane...

  • Table 49

    Data from Auxiliary Figure 17A

    10.17182/hepdata.62446.v1/t49

    Expected CLs values in the ( M(STOP), M(NEUTRALINO) ) mass plane with M(CHARGINO)-M(NEUTRALINO) = 5 GEV for the stop pair...

  • Table 50

    Data from Auxiliary Figure 17B

    10.17182/hepdata.62446.v1/t50

    Expected CLs values in the ( M(STOP), M(NEUTRALINO) ) mass plane with M(CHARGINO)-M(NEUTRALINO) = 20 GEV for the stop pair...

  • Table 51

    Data from Auxiliary Figure 18

    10.17182/hepdata.62446.v1/t51

    Expected CLs values in the ( M(CHARGINO), M(NEUTRALINO) ) mass plane with M(STOP) = 300 GEV for the stop pair...

  • Table 52

    Data from Auxiliary Figure 19A

    10.17182/hepdata.62446.v1/t52

    Observed CLs values in the ( M(STOP), M(NEUTRALINO) ) mass plane with M(CHARGINO)-M(NEUTRALINO) = 5 GEV for the stop pair...

  • Table 53

    Data from Auxiliary Figure 19B

    10.17182/hepdata.62446.v1/t53

    Observed CLs values in the ( M(STOP), M(NEUTRALINO) ) mass plane with M(CHARGINO)-M(NEUTRALINO) = 20 GEV for the stop pair...

  • Table 54

    Data from Auxiliary Figure 20

    10.17182/hepdata.62446.v1/t54

    Observed CLs values in the ( M(CHARGINO), M(NEUTRALINO) ) mass plane with M(STOP) = 300 GEV for the stop pair...

  • Table 55

    Data from Auxiliary Figure 21

    10.17182/hepdata.62446.v1/t55

    Total number of generated MC events for the stop signal grid in the ( M(STOP), M(NEUTRALINO) ) mass plane with...

  • Table 56

    Data from Auxiliary Figure 22

    10.17182/hepdata.62446.v1/t56

    Signal acceptance in the ( M(STOP), M(NEUTRALINO) ) mass plane with M(CHARGINO)-M(NEUTRALINO) = 5 GEV for the stop pair production...

  • Table 57

    Data from Auxiliary Figure 23

    10.17182/hepdata.62446.v1/t57

    Signal efficiency times acceptance in the ( M(STOP), M(NEUTRALINO) ) mass plane with M(CHARGINO)-M(NEUTRALINO) = 5 GEV for the stop...

  • Table 58

    Data from Auxiliary Figure 24A

    10.17182/hepdata.62446.v1/t58

    Total experimental systematic uncertainty in percent on the signal efficiency times acceptance in the ( M(STOP), M(NEUTRALINO) ) mass plane...

  • Table 59

    Data from Auxiliary Figure 24B

    10.17182/hepdata.62446.v1/t59

    Total experimental systematic uncertainty in percent on the signal efficiency times acceptance in the ( M(STOP), M(NEUTRALINO) ) mass plane...

  • Table 60

    Data from Auxiliary Figure 25

    10.17182/hepdata.62446.v1/t60

  • Table 61

    Data from Auxiliary Figure 26

    10.17182/hepdata.62446.v1/t61

    Signal acceptance in the ( M(STOP), M(NEUTRALINO) ) mass plane with M(CHARGINO)-M(NEUTRALINO) = 20 GEV for the stop pair production...

  • Table 62

    Data from Auxiliary Figure 27

    10.17182/hepdata.62446.v1/t62

    Signal efficiency times acceptance in the ( M(STOP), M(NEUTRALINO) ) mass plane with M(CHARGINO)-M(NEUTRALINO) = 20 GEV for the stop...

  • Table 63

    Data from Auxiliary Figure 28A

    10.17182/hepdata.62446.v1/t63

    Total experimental systematic uncertainty in percent on the signal efficiency times acceptance in the ( M(STOP), M(NEUTRALINO) ) mass plane...

  • Table 64

    Data from Auxiliary Figure 28B

    10.17182/hepdata.62446.v1/t64

    Total experimental systematic uncertainty in percent on the signal efficiency times acceptance in the ( M(STOP), M(NEUTRALINO) ) mass plane...

  • Table 65

    Data from Auxiliary Figure 29

    10.17182/hepdata.62446.v1/t65

    Total number of generated MC events for the stop signal grid in the ( M(CHARGINO), M(NEUTRALINO) ) mass plane with...

  • Table 66

    Data from Auxiliary Figure 30

    10.17182/hepdata.62446.v1/t66

    Signal acceptance in the ( M(CHARGINO), M(NEUTRALINO) ) mass plane with M(STOP) = 300 GEV for the stop pair production...

  • Table 67

    Data from Auxiliary Figure 31

    10.17182/hepdata.62446.v1/t67

    Signal efficiency times acceptance in the ( M(CHARGINO), M(NEUTRALINO) ) mass plane with M(STOP) = 300 GEV for the stop...

  • Table 68

    Data from Auxiliary Figure 32A

    10.17182/hepdata.62446.v1/t68

    Total experimental systematic uncertainty in percent on the signal efficiency times acceptance in the ( M(CHARGINO), M(NEUTRALINO) ) mass plane...

  • Table 69

    Data from Auxiliary Figure 32B

    10.17182/hepdata.62446.v1/t69

    Total experimental systematic uncertainty in percent on the signal efficiency times acceptance in the ( M(CHARGINO), M(NEUTRALINO) ) mass plane...

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