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Search for squarks and gluinos in final states with hadronically decaying $\tau$-leptons, jets, and missing transverse momentum using $pp$ collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector

The collaboration
2018.

Abstract
A search for supersymmetry in events with large missing transverse momentum, jets, and at least one hadronically decaying $\tau$-lepton is presented. Two exclusive final states with either exactly one or at least two $\tau$-leptons are considered. The analysis is based on proton-proton collisions at $\sqrt{s}$ = 13 TeV corresponding to an integrated luminosity of 36.1 fb$^{-1}$ delivered by the Large Hadron Collider and recorded by the ATLAS detector in 2015 and 2016. No significant excess is observed over the Standard Model expectation. At 95% confidence level, model-independent upper limits on the cross section are set and exclusion limits are provided for two signal scenarios: a simplified model of gluino pair production with $\tau$-rich cascade decays, and a model with gauge-mediated supersymmetry breaking (GMSB). In the simplified model, gluino masses up to 2000 GeV are excluded for low values of the mass of the lightest supersymmetric particle (LSP), while LSP masses up to 1000 GeV are excluded for gluino masses around 1400 GeV. In the GMSB model, values of the supersymmetry-breaking scale are excluded below 110 TeV for all values of $\tan\beta$ in the range $2 \leq \tan\beta \leq 60$, and below 120 TeV for $\tan\beta&gt;30$.

• #### Efficiency 1

Data from Figure 31 (b)

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1$\tau$ Compressed SR eff.

• #### Efficiency 2

Data from Figure 32 (b)

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1$\tau$ MediumMass SR eff.

• #### Efficiency 3

Data from Figure 33 (b)

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2$\tau$ Compressed SR eff.

• #### Efficiency 4

Data from Figure 34 (b)

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2$\tau$ HighMass SR eff.

• #### Efficiency 5

Data from Figure 35 (b)

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2$\tau$ multibin SR eff.

• #### Efficiency 6

Data from Figure 36 (b)

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2$\tau$ GMSB SR eff.

• #### Efficiency 7

Data from Figure 37 (b)

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1$\tau$ Compressed SR eff.

• #### Efficiency 8

Data from Figure 38 (a)

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1$\tau$ MediumMass SR eff.

• #### Efficiency 9

Data from Figure 39 (b)

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2$\tau$ Compressed SR eff.

• #### Efficiency 10

Data from Figure 40 (b)

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2$\tau$ HighMass SR eff.

• #### Efficiency 11

Data from Figure 41 (b)

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2$\tau$ multibin SR eff.

• #### Efficiency 12

Data from Figure 42 (b)

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2$\tau$ GMSB SR eff.

• #### Acceptance 1

Data from Figure 31 (a)

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1$\tau$ Compressed SR acceptance.

• #### Acceptance 2

Data from Figure 32 (a)

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1$\tau$ MediumMass SR acceptance.

• #### Acceptance 3

Data from Figure 33 (a)

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2$\tau$ Compressed SR acceptance.

• #### Acceptance 4

Data from Figure 34 (a)

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2$\tau$ HighMass SR acceptance.

• #### Acceptance 5

Data from Figure 35 (a)

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2$\tau$ multibin SR acceptance.

• #### Acceptance 6

Data from Figure 36 (a)

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2$\tau$ GMSB SR acceptance.

• #### Acceptance 7

Data from Figure 37 (a)

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1$\tau$ Compressed SR acceptance.

• #### Acceptance 8

Data from Figure 38 (a)

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1$\tau$ MediumMass SR acceptance.

• #### Acceptance 9

Data from Figure 39 (a)

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2$\tau$ Compressed SR acceptance.

• #### Acceptance 10

Data from Figure 40 (a)

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2$\tau$ HighMass SR acceptance.

• #### Acceptance 11

Data from Figure 41 (a)

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2$\tau$ multibin SR acceptance.

• #### Acceptance 12

Data from Figure 42 (a)

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2$\tau$ GMSB SR acceptance.

• #### Cutflow 1

Data from Table 18

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Cutflow table of the $1\tau$ compressed SR for the four signal benchmark scenarios of low, medium, and high mass-splitting in...

• #### Cutflow 2

Data from Table 29

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Cutflow table of the $1\tau$ medium-mass SR for the four signal benchmark scenarios of low, medium, and high mass-splitting in...

• #### Cutflow 3

Data from Table 20

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Cutflow table of the $2\tau$ compressed SR for the four signal benchmark scenarios of low, medium, and high mass-splitting in...

• #### Cutflow 4

Data from Table 21

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Cutflow table of the $2\tau$ high-mass SR for the four signal benchmark scenarios of low, medium, and high mass-splitting in...

• #### Cutflow 5

Data from Table 23

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Cutflow table of the $2\tau$ multibin SR for the four signal benchmark scenarios of low, medium, and high mass-splitting in...

• #### Cutflow 6

Data from Table 22

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Cutflow table of the $2\tau$ GMSB SR for the four signal benchmark scenarios of low, medium, and high mass-splitting in...

• #### Best SR

Data from Figure 26

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Best performing fit setups entering the final combination as a function of the LSP mass and the gluino mass. 'S'...

• #### Exclusion contour 2(obs.)

Data from Figure 10

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Observed exclusion contour at 95% CL as a function of tanBeta and the SUSY-breaking mass scale Lambda.

• #### Exclusion contour 2(exp.)

Data from Figure 10

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Expected exclusion contour at 95% CL as a function of tanBeta and the SUSY-breaking mass scale Lambda.

• #### Exclusion contour 1(obs.)

Data from Figure 9

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Observed exclusion contour at 95% CL as a function of the LSP mass and the gluino mass.

• #### Exclusion contour 1(exp.)

Data from Figure 9

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Expected exclusion contour at 95% CL as a function of the LSP mass and the gluino mass.

• #### X-section U.L. 2

Data from Figure 44 (b)

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Observed upper limits on the production cross section at 95% CL in pb as a function of tanBeta and SUSY...

• #### X-section U.L. 1

Data from Figure 24

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Observed upper limits on the production cross section at 95% CL in pb as a function of the LSP mass...

• #### Yieldtable 1

Data from Table 24

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Yields of the expected background from the SM in the bins of the multibin SR of the $2\tau$ channel with...

• #### VR kinematics 1

Data from Figure 4 (a)

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$m_{\mathrm{T}}^{\tau}$ in the compressed $m_{\mathrm{T}}^{\tau}$ VR of the $1\tau$ channel, illustrating the background modeling after the fit. The last bin...

• #### VR kinematics 2

Data from Figure 4 (b)

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$E_{\mathrm{T}}^{\mathrm{miss}}$ in the compressed $E_{\mathrm{T}}^{\mathrm{miss}}$ VR of the $1\tau$ channel, illustrating the background modeling after the fit. The last bin...

• #### VR kinematics 3

Data from Figure 4 (c)

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$m_{\mathrm{T}}^{\tau}$ in the medium-mass $m_{\mathrm{T}}^{\tau}$ VR of the $1\tau$ channel, illustrating the background modeling after the fit. The last bin...

• #### VR kinematics 4

Data from Figure 4 (d)

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$E_{\mathrm{T}}^{\mathrm{miss}}$ in the medium-mass $E_{\mathrm{T}}^{\mathrm{miss}}$ VR of the $1\tau$ channel, illustrating the background modeling after the fit. The last bin...

• #### VR kinematics 5

Data from Figure 4 (e)

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$H_{\mathrm{T}}$ in the medium-mass $H_{\mathrm{T}}$ VR of the $1\tau$ channel, illustrating the background modeling after the fit. The last bin...

• #### VR kinematics 6

Data from Figure 5 (a)

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$m_{\mathrm{T}}^{\tau_1}$ + $m_{\mathrm{T}}^{\tau_2}$ in the top VR of the $2\tau$ channel, illustrating the background modeling after the fit. The last...

• #### VR kinematics 7

Data from Figure 5 (b)

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$H_{\mathrm{T}}$ in the $W$ VR of the $2\tau$ channel, illustrating the background modeling after the fit. The last bin includes...

• #### VR kinematics 8

Data from Figure 5 (c)

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$m_{\mathrm{T}}^{\tau_1}$ + $m_{\mathrm{T}}^{\tau_2}$ in the $Z$ VR of the $2\tau$ channel, illustrating the background modeling after the fit. The last...

• #### N-1 SR kinematics 1

Data from Figure 7 (a)

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$m_{\mathrm{T}}^{\tau}$ in the compressed SR of the $1\tau$ channel before application of the $m_{\mathrm{T}}^{\tau}$ > 80 GeV requirement. The last...

• #### N-1 SR kinematics 2

Data from Figure 7 (b)

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$H_{\mathrm{T}}$ in the medium-mass SR of the $1\tau$ channel before application of the $H_{\mathrm{T}}$ > 1000 GeV requirement. The last...

• #### N-1 SR kinematics 3

Data from Figure 8 (a)

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$m_{\mathrm{T}}^{\mathrm{sum}}$ in the compressed SR of the $2\tau$ channel before application of the $m_{\mathrm{T}}^{\mathrm{sum}}$ > 1600 GeV requirement. The last...

• #### N-1 SR kinematics 4

Data from Figure 8 (b)

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$H_{\mathrm{T}}$ in the high-mass SR of the $2\tau$ channel before application of the $H_{\mathrm{T}}$ > 1100 GeV requirement. The last...

• #### SR kinematics 1

Data from Figure 8 (c)

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mT(tau_1) + mT(tau_2) in the multibin SR of the 2T channel. The last bin includes overflow events. Signal predictions corresponding...

• #### N-1 SR kinematics 5

Data from Figure 8 (d)

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$H_{\mathrm{T}}$ in the GMSB SR of the $2\tau$ channel before application of the $H_{\mathrm{T}}$ > 1900 GeV requirement. The last...

Version 2 modifications: Exchanged MG control file for three individual paramcards of the SMS benchmarks.