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Search for new phenomena in events containing a same-flavour opposite-sign dilepton pair, jets, and large missing transverse momentum in $\sqrt{s}=13$ TeV pp collisions with the ATLAS detector

The ATLAS collaboration
No Journal Information, 2016

Abstract (data abstract)
Two searches for new phenomena in final states containing a same-flavour opposite-lepton (electron or muon) pair, jets, and large missing transverse momentum are presented. These searches make use of proton--proton collision data, collected during 2015 and 2016 at a centre-of-mass energy $\sqrt{s}=13$ TeV by the ATLAS detector at the Large Hadron Collider, which correspond to an integrated luminosity of 14.7 fb$^{-1}$. Both searches target the pair production of supersymmetric particles, squarks or gluinos, which decay to final states containing a same-flavour opposite-sign lepton pair via one of two mechanisms: a leptonically decaying Z boson in the final state, leading to a peak in the dilepton invariant-mass distribution around the Z boson mass; and decays of neutralinos (e.g. $\tilde{\chi}_2^0 \rightarrow \ell^+\ell^- \tilde{\chi}_1^0$), yielding a kinematic endpoint in the dilepton invariant-mass spectrum. The data are found to be consistent with the Standard Model expectation. Results are interpreted in simplified models of gluino-pair (squark-pair) production, and provide sensitivity to gluinos (squarks) with masses as large as 1.70 TeV (980 GeV).

  • Table 1

    Data from Figure 7a

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    Dilepton invariant mass distribution in SRZ.

  • Table 2

    Data from Figure 7b

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    Dilepton transverse momentum distribution in SRZ.

  • Table 3

    Data from Figure 7c

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    Missing transverse momentum distribution in SRZ.

  • Table 4

    Data from Figure 7d

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    HT inclusive distribution in SRZ.

  • Table 5

    Data from Figure 7e

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    Jet multiplicity distribution in SRZ.

  • Table 6

    Data from Figure 7f

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    B-tagged jet multiplicity distribution in SRZ.

  • Table 7

    Data from Figure 9a

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    Dilepton invariant mass distribution in SRMedium.

  • Table 8

    Data from Figure 9b

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    Dilepton invariant mass distribution in SRMedium.

  • Table 9

    Data from Figure 9c

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    Dilepton invariant mass in SRHigh.

  • Table 10

    Data from Figure 12a

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    Expected 95% exclusion contour for the gluino simplified model with fixed N1 mass and decays to quarks and Z bosons...

  • Table 11

    Data from Figure 12a

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    Observed 95% exclusion contour for the gluino simplified model with fixed N1 mass and decays to quarks and Z bosons...

  • Table 12

    Data from Figure 12b

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    Expected 95% exclusion contour for the squark simplified model with fixed N1 mass and decays to quarks and Z bosons...

  • Table 13

    Data from Figure 12b

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    Observed 95% exclusion contour for the squark simplified model with fixed N1 mass and decays to quarks and Z bosons...

  • Table 14

    Data from Figure 13

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    Expected 95% exclusion contour for the gluino simplified model with varying N1 mass and decays to quarks and Z bosons...

  • Table 15

    Data from Figure 13

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    Observed 95% exclusion contour for the gluino simplified model with varying N1 mass and decays to quarks and Z bosons...

  • Table 16

    Data from Figure 14

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    Expected 95% exclusion contour for the gluino simplified model with sleptons in the edge SRs.

  • Table 17

    Data from Figure 14

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    Observed 95% exclusion contour for the gluino simplified model with sleptons in the edge SRs.

  • Table 18

    Data from Figure 15

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    Expected 95% exclusion contour for the gluino simplified model with decays to on- or off-shell Z bosons in the edge...

  • Table 19

    Data from Figure 15

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    Observed 95% exclusion contour for the gluino simplified model with decays to on- or off-shell Z bosons in the edge...

  • Table 20

    Data from Figure 15

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    Expected 95% exclusion contour for the gluino simplified model with decays to on- or off-shell Z bosons in SRZ.

  • Table 21

    Data from Figure 15

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    Observed 95% exclusion contour for the gluino simplified model with decays to on- or off-shell Z bosons in SRZ.

  • Table 22

    Data from Auxiliary Table 1

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    Cutflow table for three benchmark signal points from the $\tilde{g}$--$\chi_{2}^{0}$ on-shell grid in SRZ for the $ee$ and $\mu\mu$ channels...

  • Table 23

    Data from Auxiliary Table 2

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    Cutflow table for three benchmark signal points for the slepton model in SR-low, SR-medium and SR-high for the $ee$ and...

  • Table 24

    Data from Auxiliary Figure 1a

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    Signal acceptance for the gluino simplified model with decays to quarks and Z bosons in SRZ.

  • Table 25

    Data from Auxiliary Figure 1b

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    Signal efficiency for the gluino simplified model with decays to quarks and Z bosons in SRZ.

  • Table 26

    Data from Auxiliary Figure 2a

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    Signal acceptance for the gluino simplified model with decays via sleptons in SRLow.

  • Table 27

    Data from Auxiliary Figure 2b

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    Signal efficiency for the gluino simplified model with decays via sleptons in SRLow.

  • Table 28

    Data from Auxiliary Figure 2c

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    Signal acceptance for the gluino simplified model with decays via sleptons in SRMedium.

  • Table 29

    Data from Auxiliary Figure 2d

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    Signal efficiency for the gluino simplified model with decays via sleptons in SRMedium.

  • Table 30

    Data from Auxiliary Figure 2e

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    Signal acceptance for the gluino simplified model with decays via sleptons in SRHigh.

  • Table 31

    Data from Auxiliary Figure 2f

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    Signal efficiency for the gluino simplified model with decays via sleptons in SRHigh.

  • Table 32

    Data from Auxiliary Figure 3a

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    Upper limits on the signal cross-section at 95% CL for the gluino simplified model with fixed N1 mass and decays...

  • Table 33

    Data from Auxiliary Figure 3b

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    Upper limits on the signal cross-section at 95% CL for the squark simplified model with fixed N1 mass and decays...

  • Table 34

    Data from Auxiliary Figure 4

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    Upper limits on the signal cross-section at 95% CL for the gluino simplified model with varying N1 mass and decays...

  • Table 35

    Data from Auxiliary Figure 5

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    Upper limits on the signal cross-section at 95% CL for the gluino simplified model with decays via sleptons.

  • Table 36

    Data from Auxiliary Figure 6

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    Upper limits on the signal cross-section at 95% CL for the gluino simplified model with decays to on-shell or off-shell...

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