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Search for new phenomena in a lepton plus high jet multiplicity final state with the ATLAS experiment using $\sqrt{s}$ = 13 Tev proton-proton collision data

The collaboration
No Journal Information, 2017

Abstract (data abstract)
CERN-LHC. A search for new phenomena in final states characterized by high jet multiplicity, an isolated lepton (electron or muon) and either zero or at least three b-tagged jets is presented. The search uses 36.1 fb-1 of sqrt(s) = 13 TeV proton-proton collision data collected by the ATLAS experiment at the Large Hadron Collider in 2015 and 2016. The dominant sources of background are estimated using parameterized extrapolations, based on observables at medium jet multiplicity, to predict the b-tagged jet multiplicity distribution at the higher jet multiplicities used in the search. No significant excess over the Standard Model expectation is observed and 95% confidence-level limits are extracted constraining four simplified models of R-parity-violating supersymmetry that feature either gluino or top-squark pair production. The exclusion limits reach as high as 2.1 TeV in gluino mass and 1.2 TeV in top-squark mass in the models considered. In addition, an upper limit is set on the cross-section for Standard Model tttt production of 60 fb (6.5 times the Standard Model prediction) at 95% confidence level. Finally, model-independent limits are set on the contribution from new phenomena to the signal-region yields.

• #### Table 1

Data from Figure 6a

10.17182/hepdata.77491.v1/t1

The expected background and observed data with five jets in the different b-tag multiplicity bins for the 40 GeV jet...

• #### Table 2

Data from Figure 6b

10.17182/hepdata.77491.v1/t2

The expected background and observed data with six jets in the different b-tag multiplicity bins for the 40 GeV jet...

• #### Table 3

Data from Figure 6c

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The expected background and observed data with seven jets in the different b-tag multiplicity bins for the 40 GeV jet...

• #### Table 4

Data from Figure 6d

10.17182/hepdata.77491.v1/t4

The expected background and observed data with eight jets in the different b-tag multiplicity bins for the 40 GeV jet...

• #### Table 5

Data from Figure 6e

10.17182/hepdata.77491.v1/t5

The expected background and observed data with nine jets in the different b-tag multiplicity bins for the 40 GeV jet...

• #### Table 6

Data from Figure 6f

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The expected background and observed data with ten jets in the different b-tag multiplicity bins for the 40 GeV jet...

• #### Table 7

Data from Figure 6g

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The expected background and observed data with eleven jets in the different b-tag multiplicity bins for the 40 GeV jet...

• #### Table 8

Data from Figure 6h

10.17182/hepdata.77491.v1/t8

The expected background and observed data with twelve-or-more jets in the different b-tag multiplicity bins for the 40 GeV jet...

• #### Table 9

Data from Figure 7a

10.17182/hepdata.77491.v1/t9

The expected background and observed data with five jets in the different b-tag multiplicity bins for the 60 GeV jet...

• #### Table 10

Data from Figure 7b

10.17182/hepdata.77491.v1/t10

The expected background and observed data with six jets in the different b-tag multiplicity bins for the 60 GeV jet...

• #### Table 11

Data from Figure 7c

10.17182/hepdata.77491.v1/t11

The expected background and observed data with seven jets in the different b-tag multiplicity bins for the 60 GeV jet...

• #### Table 12

Data from Figure 7d

10.17182/hepdata.77491.v1/t12

The expected background and observed data with eight jets in the different b-tag multiplicity bins for the 60 GeV jet...

• #### Table 13

Data from Figure 7e

10.17182/hepdata.77491.v1/t13

The expected background and observed data with nine jets in the different b-tag multiplicity bins for the 60 GeV jet...

• #### Table 14

Data from Figure 7f

10.17182/hepdata.77491.v1/t14

The expected background and observed data with ten-or-more jets in the different b-tag multiplicity bins for the 60 GeV jet...

• #### Table 15

Data from Figure 8a

10.17182/hepdata.77491.v1/t15

The expected background and observed data with five jets in the different b-tag multiplicity bins for the 80 GeV jet...

• #### Table 16

Data from Figure 8b

10.17182/hepdata.77491.v1/t16

The expected background and observed data with six jets in the different b-tag multiplicity bins for the 80 GeV jet...

• #### Table 17

Data from Figure 8c

10.17182/hepdata.77491.v1/t17

The expected background and observed data with seven jets in the different b-tag multiplicity bins for the 80 GeV jet...

• #### Table 18

Data from Figure 8d

10.17182/hepdata.77491.v1/t18

The expected background and observed data with eight jets in the different b-tag multiplicity bins for the 80 GeV jet...

• #### Table 19

Data from Figure 8e

10.17182/hepdata.77491.v1/t19

The expected background and observed data with nine jets in the different b-tag multiplicity bins for the 80 GeV jet...

• #### Table 20

Data from Figure 8f

10.17182/hepdata.77491.v1/t20

The expected background and observed data with ten-or-more jets in the different b-tag multiplicity bins for the 80 GeV jet...

• #### Table 21

Data from Figure 9a

10.17182/hepdata.77491.v1/t21

Observed exclusion contours on the gluino and neutralino masses in a model where the gluino decays via a virtual top...

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Data from Figure 9a

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Expected exclusion contours on the gluino and neutralino masses in a model where the gluino decays via a virtual top...

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Data from Figure 9b

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Observed exclusion contours on the gluino and stop masses in a model where the gluino decays to a top quark...

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Data from Figure 9b

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Expected exclusion contours on the gluino and stop masses in a model where the gluino decays to a top quark...

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Data from Figure 9c

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Observed exclusion contours on the gluino and neutralino masses in a model with a gluino decaying to two light quarks...

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Data from Figure 9c

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Expected exclusion contours on the gluino and neutralino masses in a model with a gluino decaying to two light quarks...

• #### Table 27

Data from Figure 10

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Observed exclusion contours on the stop and neutralino masses in a model where the stop decays to a third-generation quark...

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Data from Figure 10

10.17182/hepdata.77491.v1/t28

Expected exclusion contours on the stop and neutralino masses in a model where the stop decays to a third-generation quark...

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Data from Figure 10

10.17182/hepdata.77491.v1/t29

Observed exclusion contours on the stop and neutralino masses in a model where the stop decays to a top and...

• #### Table 30

Data from Figure 10

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Expected exclusion contours on the stop and neutralino masses in a model where the stop decays to a top and...

• #### Table 31

Data from Auxiliary Figure 4a

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Observed upper limits on the model cross-section in units of pb as a function of the gluino and neutralino masses...

• #### Table 32

Data from Auxiliary Figure 4b

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Observed upper limits on the model cross-section in units of pb as a function of the gluino and stop masses...

• #### Table 33

Data from Auxiliary Figure 4c

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Observed upper limits on the model cross-section in units of pb as a function of the gluino and neutralino masses...

• #### Table 34

Data from Auxiliary Figure 5a

10.17182/hepdata.77491.v1/t34

Observed upper limits on the model cross-section in units of pb as a function of the stop and neutralino masses...

• #### Table 35

Data from Auxiliary Figure 5b

10.17182/hepdata.77491.v1/t35

Observed upper limits on the model cross-section in units of pb as a function of the stop and neutralino masses...

• #### Table 36

Data from Auxiliary Figure 6a

10.17182/hepdata.77491.v1/t36

Acceptance as a function of the gluino and stop masses in a model where the gluino decays to a top...

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Data from Auxiliary Figure 6b

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Efficiency as a function of the gluino and stop masses in a model where the gluino decays to a top...

• #### Table 38

Data from Auxiliary Figure 7a

10.17182/hepdata.77491.v1/t38

Acceptance as a function of the gluino and neutralino masses in a model with a gluino decaying to two light...

• #### Table 39

Data from Auxiliary Figure 7b

10.17182/hepdata.77491.v1/t39

Efficiency as a function of the gluino and neutralino masses in a model with a gluino decaying to two light...

• #### Table 40

Data from Auxiliary Table 1

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Cut flow for a model of gluino pair production where the gluino decays to two (u, d, s, c) quarks...

• #### Table 41

Data from Auxiliary Table 2

10.17182/hepdata.77491.v1/t41

Cut flow for a model of gluino pair production where each gluino decays to a top quark and a top...

• #### Table 42

Data from Auxiliary Table 3

10.17182/hepdata.77491.v1/t42

Cut flow for a model of gluino pair production where each gluino decays via an off-shell top squark to two...

• #### Table 43

Data from Auxiliary Table 4

10.17182/hepdata.77491.v1/t43

Cut flow for a model of right-handed top squark pair production with the top squark decaying to the lightest supersymmetric...