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Search for massive supersymmetric particles decaying to many jets using the ATLAS detector in $pp$ collisions at $\sqrt{s} = 8$ TeV

The ATLAS collaboration
Phys.Rev. D91 (2015) 112016, 2015

Abstract (data abstract)
CERN-LHC. Results of a search for decays of massive particles to fully hadronic final states are presented. This search uses 20.3 fb$^{-1}$ of data collected by the ATLAS detector in $\sqrt{s} = 8$ TeV proton--proton collisions at the LHC. Signatures based on high jet multiplicities without requirements on the missing transverse momentum are used to search for $R$-parity-violating supersymmetric gluino pair production with subsequent decays to quarks. The analysis is performed using a requirement on the number of jets, in combination with separate requirements on the number of b-tagged jets, as well as a topological observable formed from the scalar sum of the mass values of large-radius jets in the event. Results are interpreted in the context of all possible branching ratios of direct gluino decays to various quark flavors. No significant deviation is observed from the expected Standard Model backgrounds estimated using jet-counting as well as data-driven templates of the total-jet-mass spectra. Gluino pair decays to ten or more quarks via intermediate neutralinos are excluded for a gluino with mass $m_{\tilde{g}} < 1$ TeV for a neutralino mass $m_{\tilde{\chi}^0_1} = 500$ GeV. Direct gluino decays to six quarks are excluded for $m_{\tilde{g}} < 917$ GeV for light-flavor final states, and results for various flavor hypotheses are presented.

  • Table 1

    Data from Fig 4a

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    Expected and observed event yields for signal regions with at least 6 jets as a function of transverse momentum requirements.

  • Table 2

    Data from Fig 4b

    10.17182/hepdata.68641.v1/t2

    Expected and observed event yields for signal regions with at least 6 jets with at least 1 b-tag as a...

  • Table 3

    Data from Fig 4c

    10.17182/hepdata.68641.v1/t3

    Expected and observed event yields for signal regions with at least 6 jets with at least 2 b-tags as a...

  • Table 4

    Data from Fig 4d

    10.17182/hepdata.68641.v1/t4

    Expected and observed event yields for signal regions with at least 7 jets as a function of transverse momentum requirements.

  • Table 5

    Data from Fig 4e

    10.17182/hepdata.68641.v1/t5

    Expected and observed event yields for signal regions with at least 7 jets with at least 1 b-tag as a...

  • Table 6

    Data from Fig 4f

    10.17182/hepdata.68641.v1/t6

    Expected and observed event yields for signal regions with at least 7 jets with at least 2 b-tags as a...

  • Table 7

    Data from Tab 2

    10.17182/hepdata.68641.v1/t7

    Table showing the predicted yields in the SM and observed number of events in SR1 as well as all signal...

  • Table 8

    Data from Tab 3

    10.17182/hepdata.68641.v1/t8

    Table showing the predicted yields in the SM and observed number of events in SR100 as well as three representative...

  • Table 9

    Data from Tab 4

    10.17182/hepdata.68641.v1/t9

    Table showing the predicted yields in the SM and observed number of events in SR250 as well as three representative...

  • Table 10

    Data from Fig 9

    10.17182/hepdata.68641.v1/t10

    Expected 95% CL exclusion contour using the best expected limit from SR100 or SR250.

  • Table 11

    Data from Fig 9

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    Observed 95% CL exclusion contour using the best expected limit from SR100 or SR250.

  • Table 12

    Data from Fig 14a

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    Expected 95% CL exclusion contour using the best expected limit from the jet-counting analysis when using signal regions without b-tag...

  • Table 13

    Data from Fig 14a

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    Observed 95% CL exclusion contour using the best expected limit from the jet-counting analysis when using signal regions without b-tag...

  • Table 14

    Data from Fig 14b

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    Expected 95% CL exclusion contour using the best expected limit from the jet-counting analysis when allowing b-tags.

  • Table 15

    Data from Fig 14b

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    Observed 95% CL exclusion contour using the best expected limit from the jet-counting analysis when allowing b-tags.

  • Table 16

    Data from Aux Fig 13a

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    Observed cross-section exclusion in units of pb at 95% C.L., in the gluino/neutralino mass plane, for the resolved analysis when...

  • Table 17

    Data from Aux Fig 13b

    10.17182/hepdata.68641.v1/t17

    Observed cross-section exclusion in units of pb at 95% C.L., in the gluino/neutralino mass plane, for the resolved analysis when...

  • Table 18

    Data from Aux Fig 18a

    10.17182/hepdata.68641.v1/t18

    Observed cross-section exclusion in units of pb at 95% C.L., in the gluino/neutralino mass plane, for the merged analysis, when...

  • Table 19

    Data from Aux Fig 18a

    10.17182/hepdata.68641.v1/t19

    Expected exclusion contour at 95% C.L., in the gluino/neutralino mass plane, for the merged analysis, when SR1 is used for...

  • Table 20

    Data from Aux Fig 18a

    10.17182/hepdata.68641.v1/t20

    Observed exclusion contour at 95% C.L., in the gluino/neutralino mass plane, for the merged analysis, when SR1 is used for...

  • Table 21

    Data from Aux Fig 18b

    10.17182/hepdata.68641.v1/t21

    Observed cross-section exclusion in units of pb at 95% C.L., in the gluino/neutralino mass plane, for the merged analysis, when...

  • Table 22

    Data from Aux Fig 18b

    10.17182/hepdata.68641.v1/t22

    Expected exclusion contour at 95% C.L., in the gluino/neutralino mass plane, for the merged analysis, when SR100 is used for...

  • Table 23

    Data from Aux Fig 18b

    10.17182/hepdata.68641.v1/t23

    Observed exclusion contour at 95% C.L., in the gluino/neutralino mass plane, for the merged analysis, when SR100 is used for...

  • Table 24

    Data from Aux Fig 18c

    10.17182/hepdata.68641.v1/t24

    Observed cross-section exclusion in units of pb at 95% C.L., in the gluino/neutralino mass plane, for the merged analysis, when...

  • Table 25

    Data from Aux Fig 18c

    10.17182/hepdata.68641.v1/t25

    Expected exclusion contour at 95% C.L., in the gluino/neutralino mass plane, for the merged analysis, when SR250 is used for...

  • Table 26

    Data from Aux Fig 18c

    10.17182/hepdata.68641.v1/t26

    Observed exclusion contour at 95% C.L., in the gluino/neutralino mass plane, for the merged analysis, when SR250 is used for...

  • Table 27

    Data from Aux Fig 18d

    10.17182/hepdata.68641.v1/t27

    Observed cross-section exclusion in units of pb at 95% C.L., in the gluino/neutralino mass plane, for the merged analysis, when...

  • Table 28

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    Acceptance times efficiency in the gluino/neutralino mass plane, when SR1 is used in each point.

  • Table 29

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    Signal acceptance times efficiency for signal regions with at least 7 jets as a function of transverse momentum requirements.

  • Table 30

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    Signal acceptance times efficiency for signal regions with at least 7 jets with at least 1 b-tag as a function...

  • Table 31

    10.17182/hepdata.68641.v1/t31

    Signal acceptance times efficiency for signal regions with at least 7 jets with at least 2 b-tags as a function...

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