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Search for gluinos in events with an isolated lepton, jets and missing transverse momentum at $\sqrt{s}$ = 13 TeV with the ATLAS detector

The collaboration
No Journal Information, 2016

Abstract (data abstract)
CERN-LHC. The results of a search for gluinos in final states with an isolated electron or muon, multiple jets and large missing transverse momentum using proton--proton collision data at a centre-of-mass energy of $\sqrt{s}$ = 13 TeV are presented. The dataset used was recorded in 2015 by the ATLAS experiment at the Large Hadron Collider and corresponds to an integrated luminosity of 3.2 fb$^{-1}$. Six signal selections are defined that best exploit the signal characteristics. The data agree with the Standard Model background expectation in all six signal selections, and the largest deviation is a 2.1 standard deviation excess. The results are interpreted in a simplified model where pair-produced gluinos decay via the lightest chargino to the lightest neutralino. In this model, gluinos are excluded up to masses of approximately 1.6 TeV depending on the mass spectrum of the simplified model, thus surpassing the limits of previous searches.

• #### Table 1

Data from Figure 3a

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The distribution of the missing transverse momentum is shown in hard-lepton 6-jet ttbar control regions after normalising the ttbar and...

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Data from Figure 3b

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The distribution of the missing transverse momentum is shown in hard-lepton 6-jet W+jets control regions after normalising the ttbar and...

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Data from Figure 3c

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The distribution of the missing transverse momentum is shown in soft-lepton 2-jet ttbar control regions after normalising the ttbar and...

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Data from Figure 3d

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The distribution of the missing transverse momentum is shown in soft-lepton 2-jet W+jets control regions after normalising the ttbar and...

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Data from Figure 4a

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Expected background yields as obtained in the background-only fits in all hard-lepton and soft-lepton validation together with observed data are...

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Data from Figure 4b

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Expected background yields as obtained in the background-only fits in all hard-lepton and soft-lepton signal together with observed data are...

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Data from Figure 5a

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Distributions of mt for the hard-lepton 4-jet low-x signal region. The requirement on the variable plotted is removed from the...

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Data from Figure 5b

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Distributions of met/meff for the 4-jet high-x signal region. The requirement on the variable plotted is removed from the definitions...

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Data from Figure 5c

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Distributions of mt for the hard-lepton 5-jet signal region. The requirement on the variable plotted is removed from the definitions...

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Data from Figure 5d

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Distributions of mt for the hard-lepton 6-jet signal region. The requirement on the variable plotted is removed from the definitions...

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Data from Figure 5e

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Distributions of met for the soft-lepton 2-jet signal region. The requirement on the variable plotted is removed from the definitions...

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Data from Figure 5f

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Distributions of met for the soft-lepton 5-jet signal region. The requirement on the variable plotted is removed from the definitions...

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Data from Figure 6a

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The observed combined 95% CL exclusion limits in the the gluino simplified models using for each model point the signal...

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Data from Figure 6a

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The expected combined 95% CL exclusion limits in the the gluino simplified models using for each model point the signal...

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Data from Figure 6a

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The yellow band ($+ 1 \sigma$) of the combined 95% CL exclusion limits in the the gluino simplified models using...

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Data from Figure 6a

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The yellow band ($- 1 \sigma$) of the combined 95% CL exclusion limits in the the gluino simplified models using...

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Data from Figure 6b

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The observed combined 95% CL exclusion limits in the the gluino simplified models using for each model point the signal...

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Data from Figure 6b

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The expected combined 95% CL exclusion limits in the the gluino simplified models using for each model point the signal...

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Data from Figure 6b

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The yellow band ($+ 1 \sigma$) of the combined 95% CL exclusion limits in the the gluino simplified models using...

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Data from Figure 6b

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The yellow band ($- 1 \sigma$) of the combined 95% CL exclusion limits in the the gluino simplified models using...

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Data from Auxiliary Figure 1a

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The observed limits for the soft-lepton 2-jet signal region. The limits are presented in the (gluino, chargino) mass plane for...

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Data from Auxiliary Figure 1a

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The expected limits for the soft-lepton 2-jet signal region. The limits are presented in the (gluino, chargino) mass plane for...

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Data from Auxiliary Figure 1a

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The observed limits for the hard-lepton 4-jet low-x signal region. The limits are presented in the (gluino, chargino) mass plane...

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Data from Auxiliary Figure 1a

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The expected limits for the hard-lepton 4-jet low-x signal region. The limits are presented in the (gluino, chargino) mass plane...

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Data from Auxiliary Figure 1a

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The observed limits for the hard-lepton 5-jet signal region. The limits are presented in the (gluino, chargino) mass plane for...

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Data from Auxiliary Figure 1a

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The expected limits for the hard-lepton 5-jet signal region. The limits are presented in the (gluino, chargino) mass plane for...

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Data from Auxiliary Figure 1a

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The observed limits for the hard-lepton 6-jet signal region. The limits are presented in the (gluino, chargino) mass plane for...

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Data from Auxiliary Figure 1a

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The expected limits for the hard-lepton 6-jet signal region. The limits are presented in the (gluino, chargino) mass plane for...

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Data from Auxiliary Figure 1b

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The observed limits for the soft-lepton 5-jet signal region. The limits are presented in the (gluino, x) plane for the...

• #### Table 30

Data from Auxiliary Figure 1b

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The expected limits for the soft-lepton 5-jet signal region. The limits are presented in the (gluino, x) plane for the...

• #### Table 31

Data from Auxiliary Figure 1b

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The observed limits for the hard-lepton 4-jet low-x signal region. The limits are presented in the (gluino, x) plane for...

• #### Table 32

Data from Auxiliary Figure 1b

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The expected limits for the hard-lepton 4-jet low-x signal region. The limits are presented in the (gluino, x) plane for...

• #### Table 33

Data from Auxiliary Figure 1b

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The observed limits for the hard-lepton 4-jet high-x signal region. The limits are presented in the (gluino, x) plane for...

• #### Table 34

Data from Auxiliary Figure 1b

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The expected limits for the hard-lepton 4-jet high-x signal region. The limits are presented in the (gluino, x) plane for...

• #### Table 35

Data from Auxiliary Figure 1b

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The observed limits for the hard-lepton 5-jet signal region. The limits are presented in the (gluino, x) plane for the...

• #### Table 36

Data from Auxiliary Figure 1b

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The expected limits for the hard-lepton 5-jet signal region. The limits are presented in the (gluino, x) plane for the...

• #### Table 37

Data from Auxiliary Figure 1b

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The observed limits for the hard-lepton 6-jet signal region. The limits are presented in the (gluino, x) plane for the...

• #### Table 38

Data from Auxiliary Figure 1b

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The expected limits for the hard-lepton 6-jet signal region. The limits are presented in the (gluino, x) plane for the...

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Data from Auxiliary Figure 5a

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Number of generated events in the (gluino, chargino) mass plane for the scenario where the mass of the chargino is...

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Data from Auxiliary Figure 5b

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Number of generated events in the (gluino, x) plane for the chargino = 60 GeV models.

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Data from Auxiliary Figure 6a

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Production cross-section in the (gluino, chargino) mass plane for the scenario where the mass of the chargino is fixed to...

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Data from Auxiliary Figure 6b

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Production cross-section in the (gluino, x) plane for the chargino = 60 GeV models.

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Data from Auxiliary Figure 7a

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Acceptance times efficiency obtained in the different signal regions in the (gluino, chargino) mass plane for the scenario where the...

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Data from Auxiliary Figure 7b

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Acceptance times efficiency in the different signal regions in the (gluino, chargino) mass plane for the scenario where the mass...

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Data from Auxiliary Figure 7c

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Acceptance times efficiency in the different signal regions in the (gluino, chargino) mass plane for the scenario where the mass...

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Data from Auxiliary Figure 7d

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Acceptance times efficiency in the different signal regions in the (gluino, chargino) mass plane for the scenario where the mass...

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Data from Auxiliary Figure 7e

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Acceptance times efficiency in the different signal regions in the (gluino, chargino) mass plane for the scenario where the mass...

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Data from Auxiliary Figure 8a

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Acceptance times efficiency obtained in the different signal regions in the (gluino, x) plane for the chargino = 60 GeV...

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Data from Auxiliary Figure 8b

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Acceptance times efficiency in the different signal regions in the (gluino, x) plane for the chargino = 60 GeV models...

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Data from Auxiliary Figure 8c

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Acceptance times efficiency in the different signal regions in the (gluino, x) plane for the chargino = 60 GeV models...

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Data from Auxiliary Figure 8d

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Acceptance times efficiency in the different signal regions in the (gluino, x) plane for the chargino = 60 GeV models...

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Data from Auxiliary Figure 8e

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Acceptance times efficiency in the different signal regions in the (gluino, x) plane for the chargino = 60 GeV models...

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Data from Auxiliary Figure 9a

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The observed CLs values as obtained in the different signal regions in the (gluino, chargino) mass plane for the scenario...

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Data from Auxiliary Figure 9b

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The observed CLs values as obtained in the different signal regions in the (gluino, chargino) mass plane for the scenario...

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Data from Auxiliary Figure 9c

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The observed CLs values as obtained in the different signal regions in the (gluino, chargino) mass plane for the scenario...

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Data from Auxiliary Figure 9d

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The observed CLs values as obtained in the different signal regions in the (gluino, chargino) mass plane for the scenario...

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Data from Auxiliary Figure 9e

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The observed CLs values as obtained in the different signal regions in the (gluino, chargino) mass plane for the scenario...

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Data from Auxiliary Figure 10a

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The expected CLs values as obtained in the different signal regions in the (gluino, chargino) mass plane for the scenario...

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Data from Auxiliary Figure 10b

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The expected CLs values as obtained in the different signal regions in the (gluino, chargino) mass plane for the scenario...

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Data from Auxiliary Figure 10c

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The expected CLs values as obtained in the different signal regions in the (gluino, chargino) mass plane for the scenario...

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Data from Auxiliary Figure 10d

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The expected CLs values as obtained in the different signal regions in the (gluino, chargino) mass plane for the scenario...

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Data from Auxiliary Figure 10e

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The expected CLs values as obtained in the different signal regions in the (gluino, chargino) mass plane for the scenario...

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Data from Auxiliary Figure 11a

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The observed CLs values as obtained in the different signal regions in the (gluino, x) plane for the chargino =...

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Data from Auxiliary Figure 11b

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The observed CLs values as obtained in the different signal regions in the (gluino, x) plane for the chargino =...

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Data from Auxiliary Figure 11c

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The observed CLs values as obtained in the different signal regions in the (gluino, x) plane for the chargino =...

• #### Table 66

Data from Auxiliary Figure 11d

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The observed CLs values as obtained in the different signal regions in the (gluino, x) plane for the chargino =...

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Data from Auxiliary Figure 11e

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The observed CLs values as obtained in the different signal regions in the (gluino, x) plane for the chargino =...

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Data from Auxiliary Figure 12a

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The expected CLs values as obtained in the different signal regions in the (gluino, x) plane for the chargino =...

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Data from Auxiliary Figure 12b

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The expected CLs values as obtained in the different signal regions in the (gluino, x) plane for the chargino =...

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Data from Auxiliary Figure 12c

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The expected CLs values as obtained in the different signal regions in the (gluino, x) plane for the chargino =...

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Data from Auxiliary Figure 12d

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The expected CLs values as obtained in the different signal regions in the (gluino, x) plane for the chargino =...

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Data from Auxiliary Figure 12e

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The expected CLs values as obtained in the different signal regions in the (gluino, x) plane for the chargino =...

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Data from Auxiliary Figure 13a

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The signal region yielding in the best expected limit is indicated for every signal point used in the the gluino...

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Data from Auxiliary Figure 13b

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The signal region yielding in the best expected limit is indicated for every signal point used in the the gluino...

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Data from Auxiliary Figure 14a

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Model-dependent 95% CL upper limits on the visible cross-section in addition to the observed and expected exclusion limits for the...

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Data from Auxiliary Figure 14b

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Model-dependent 95% CL upper limits on the visible cross-section in addition to the observed and expected exclusion limits for the...

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Data from Table 1

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Simulated background event samples: the corresponding generator, parton shower, cross-section normalisation, PDF set and underlying-event tune are shown.

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Data from Table 2

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Overview of the selection criteria for the soft-lepton signal regions. The symbol $p_{T}^{l}$ refers to signal leptons.

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Data from Table 3

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Overview of the selection criteria for the hard-lepton signal regions. The symbol $p_{T}^{l}$ refers to signal leptons.

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Data from Table 4

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Background fit results for the hard-lepton and soft-lepton signal regions, for an integrated luminosity of 3.2 fb-1. Uncertainties in the...

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Data from Table 5

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Breakdown of upper limits. The columns show from left to right: the name of the respective signal region; the 95%...

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Data from Auxiliary Table 1

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Table shows the data, fitted background and expected signal event counts for a benchmark signal point in each bin of...

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Data from Auxiliary Table 2

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Table shows the data, fitted background and expected signal event counts for a benchmark signal point in each bin of...

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Data from Auxiliary Table 3

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Table shows the data, fitted background and expected signal event counts for a benchmark signal point in each bin of...

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Data from Auxiliary Table 4

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Table shows the data, fitted background and expected signal event counts for a benchmark signal point in each bin of...

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Data from Auxiliary Table 5

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Table shows the data, fitted background and expected signal event counts for a benchmark signal point in each bin of...

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Data from Auxiliary Table 6

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Table shows the data, fitted background and expected signal event counts for a benchmark signal point in each bin of...

• #### Table 88

Data from Auxiliary Table 7

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Cutflow table for the hard-lepton signal regions with representative target signal models. The weighted numbers are normalized to 3.2 fb-1...

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Data from Auxiliary Table 8

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Cutflow table for the hard-lepton signal regions with representative target signal models. The weighted numbers are normalized to 3.2 fb-1...