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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 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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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 18

Data from Aux Fig 18a

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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