Search for vector-like quarks in events with two oppositely charged leptons and jets in proton-proton collisions at $\sqrt{s} =$ 13 TeV

The CMS collaboration
Eur.Phys.J., 2018

Abstract (data abstract)
A search for the pair production of heavy vector-like partners T and B of the top and bottom quarks has been performed by the CMS experiment at the CERN LHC using proton-proton collisions at √s = 13 TeV. The data sample was collected in 2016 and corresponds to an integrated luminosity of 35.9fb−1. Final states studied for TTbar production include those where one of the T quarks decays via T → tZ and the other via T → bW, tZ, or tH, where H is a Higgs boson. For the BBbar case, final states include those where one of the B quarks decays via B → bZ and the other B → tW, bZ, or bH. Events with two oppositely charged electrons or muons, consistent with coming from the decay of a Z boson, and jets are investigated. The number of observed events is consistent with standard model background estimations. Lower limits at 95% confidence level are placed on the masses of the T and B quarks for a range of branching fractions. Assuming 100% branching fractions for T → tZ, and B → bZ, T and B quark mass values below 1280 and 1130 GeV, respectively, are excluded.

  • Figure3a

    Data from Figure 3 (top left), located on Page 11 of the preprint.

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    The $S_{\rm T}$ distribution for group A before fitting.

  • Figure3b

    Data from Figure 3 (top right), located on Page 11 of the preprint.

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    The $S_{\rm T}$ distribution for group B before fitting.

  • Figure3c

    Data from Figure 3 (bottom left), located on Page 11 of the preprint.

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    The $S_{\rm T}$ distribution for group C before fitting.

  • Figure3d

    Data from Figure 3 (bottom right), located on Page 11 of the preprint.

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    The $S_{\rm T}$ distribution for group D before fitting.

  • Figure4a

    Data from Figure 4 (top left), located on Page 13 of the preprint.

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    The observed and expected 95% CL upper limits on the $T\bar T$ cross section as a function of the T...

  • Figure4b

    Data from Figure 4 (top right), located on Page 13 of the preprint.

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    The observed and expected 95% CL upper limits on the $T\bar T$ cross section as a function of the T...

  • Figure4c

    Data from Figure 4 (bottom), located on Page 13 of the preprint.

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    The observed and expected 95% CL upper limits on the $T\bar T$ cross section as a function of the T...

  • Table5

    Data from Table 5, located on Page 10 of the preprint.

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    The number of observed events and the predicted number of SM background events in the $T\bar T$ search using electron...

  • Table6

    Data from Table 6, located on Page 12 of the preprint.

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    The number of observed events and the predicted number of SM background events in the $T\bar T$ search using muon...

  • Figure6a

    Data from Figure 6 (top left), located on Page 16 of the preprint.

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    The $S_{\rm T}$ distribution for 1b event category for data and the expected background before fitting.

  • Figure6b

    Data from Figure 6 (top right), located on Page 16 of the preprint.

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    The $S_{\rm T}$ distribution for 2b event category for data and the expected background.

  • Figure6c

    Data from Figure 6 (middle left), located on Page 16 of the preprint.

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    The $S_{\rm T}$ distribution for boosted t event category for data and the expected background.

  • Figure6d

    Data from Figure 6 (middle right), located on Page 16 of the preprint.

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    The $S_{\rm T}$ distribution for boosted H event category for data and the expected background.

  • Figure6e

    Data from Figure 6 (bottom), located on Page 16 of the preprint.

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    The $S_{\rm T}$ distribution for boosted Z event category for data and the expected background.

  • Figure7a

    Data from Figure 7 (top left), located on Page 17 of the preprint.

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    The observed and expected 95% CL upper limits on the $B\bar B$ cross section as a function of the B...

  • Figure7b

    Data from Figure 7 (top right), located on Page 17 of the preprint.

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    The observed and expected 95% CL upper limits on the $B\bar B$ cross section as a function of the B...

  • Figure7c

    Data from Figure 7 (bottom), located on Page 17 of the preprint.

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    The observed and expected 95% CL upper limits on the $B\bar B$ cross section as a function of the B...

  • Table7

    Data from Table 7, located on Page 15 of the preprint.

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    The number of observed events and the predicted number of SM background events in the $B\bar B$ search using electron...

  • Table8

    Data from Table 8, located on Page 15 of the preprint.

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    The number of observed events and the predicted number of SM background events in the $B\bar B$ search using muon...

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