Search for supersymmetry in proton-proton collisions at 13 TeV using identified top quarks

The CMS collaboration
Phys.Rev. D97 (2018) 012007, 2018

Abstract (data abstract)
CERN-LHC. CMS. A search for supersymmetry is presented based on proton-proton collision events containing identified hadronically decaying top quarks, no leptons, and an imbalance pT_miss in transverse momentum. The data were collected with the CMS detector at the CERN LHC at a center-of-mass energy of 13 TeV, and correspond to an integrated luminosity of 35.9 fb−1. Search regions are defined in terms of the multiplicity of bottom quark jet and top quark candidates, the pT_miss, the scalar sum of jet transverse momenta, and the mT2 mass variable. No statistically significant excess of events is observed relative to the expectation from the standard model. Lower limits on the masses of supersymmetric particles are determined at 95% confidence level in the context of simplified models with top quark production. For a model with direct top squark pair production followed by the decay of each top squark to a top quark and a neutralino, top squark masses up to 1020 GeV and neutralino masses up to 430 GeV are excluded. For a model with pair production of gluinos followed by the decay of each gluino to a top quark-antiquark pair and a neutralino, gluino masses up to 2040 GeV and neutralino masses up to 1150 GeV are excluded. These limits extend previous results.

  • Figure 8

    Data from Figure 8 of publication

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    Figure 8. The 95% CL upper limit on the production cross section of the T2tt simplified model as a function...

  • Figure 8 observed contour

    Data from Figure 8 of publication

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    Figure 8. Observed exclusion region at 95% CL assuming 100% branching fraction.

  • Figure 8 expected contour

    Data from Figure 8 of publication

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    Figure 8. Expected exclusion region at 95% CL assuming 100% branching fraction.

  • Figure 9a

    Data from Figure 9a (upper left) of publication

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    Figure 9a (upper left). The 95% CL upper limit on the production cross section of the T1tttt simplified models as...

  • Figure 9a observed contour

    Data from Figure 9a (upper left) of publication

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    Figure 9a (upper left). Observed exclusion region at 95% CL assuming 100% branching fraction.

  • Figure 9a expected contour

    Data from Figure 9a (upper left) of publication

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    Figure 9a (upper left). Expected exclusion region at 95% CL assuming 100% branching fraction.

  • Figure 9b

    Data from Figure 9b (upper right) of publication

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    Figure 9b (upper right). The 95% CL upper limit on the production cross section of the T1ttbb simplified models as...

  • Figure 9b observed contour

    Data from Figure 9b (upper right) of publication

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    Figure 9b (upper right). Observed exclusion region at 95% CL.

  • Figure 9b expected contour

    Data from Figure 9b (upper right) of publication

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    Figure 9b (upper right). Expected exclusion region at 95%.

  • Figure 9c

    Data from Figure 9c (bottom left) of publication

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    Figure 9c (bottom left). The 95% CL upper limit on the production cross section of the T5tttt simplified models as...

  • Figure 9c observed contour

    Data from Figure 9c (bottom left) of publication

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    Figure 9c (bottom left). Observed exclusion region at 95% CL assuming 100% branching fraction.

  • Figure 9c expected contour

    Data from Figure 9c (bottom left) of publication

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    Figure 9c (bottom left). Expected exclusion region at 95% CL assuming 100% branching fraction.

  • Figure 9d

    Data from Figure 9d (bottom right) of publication

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    Figure 9d (bottom right). The 95% CL upper limit on the production cross section of the T5ttcc simplified models as...

  • Figure 9d observed contour

    Data from Figure 9d (bottom right) of publication

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    Figure 9d (bottom right). Observed exclusion region at 95% CL.

  • Figure 9d expected contour

    Data from Figure 9d (bottom right) of publication

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    Figure 9d (bottom right). Expected exclusion region at 95% CL.

  • Table 2

    Data from Table 2

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    The observed number of events and the total background prediction for search regions with Nt = 1 and Nb =...

  • Table 3

    Data from Table 3

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    The observed number of events and the total background prediction for search regions with Nt = 1 and Nb ≥...

  • Table 4

    Data from Table 4

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    The observed number of events and the total background prediction for search regions with Nt ≥ 2.

  • Additional Table 4

    Data from Additional Table 4

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    Selected T2tt signal yields for the aggregate search bins.

  • Additional Table 5

    Data from Additional Table 5

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    Selected gluino mediated signal yields for the aggregate search bins.

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