Search for production of a single vector-like quark decaying to tH or tZ in the all-hadronic final state in pp collisions at $\sqrt{s}$ = 13 TeV

The CMS collaboration
CMS-B2G-19-001, 2024.

Abstract (data abstract)
A search for electroweak production of a single vector-like quark tprime in association with a bottom quark (b) and decaying fully hadronically is presented. This search uses proton-proton collision data at $\sqrt{s} = 13\TeV$ collected by the CMS experiment at the CERN LHC during 2016-2018, corresponding to an integrated luminosity of 138\fbinv. The tprime have charge 2/3 and can decay to a top quark (t) and a Higgs or Z boson. Event kinematics and the presence of jets containing b hadrons are used to reconstruct the hadronic decays of the t and Higgs or Z boson. No discrepancy from the standard model prediction is observed in the data. For \tprime masses from 600 to 1200~GeV, the 95% confidence level upper limits on the production cross section of a tprime produced in association with a b and decaying via a t and a Higgs or Z boson range from 1260 to 68 fb.

  • Figure 2

    Data from Figure 2, located on page 8.

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    Five-jet invariant mass distributions in the 2M1L region after the high-mass (green crosses) and low-mass (black circles) selections in 2018...

  • Figure 3a

    Data from Figure 3, located on page 10.

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    Weights from b tagging efficiency ratios as functions of the five-jet invariant mass in 2018 data for the low-mass selection,...

  • Figure 3b

    Data from Figure 3, located on page 10.

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    Weights from b tagging efficiency ratios as functions of the five-jet invariant mass in 2018 data for the low-mass selection,...

  • Figure 3c

    Data from Figure 3, located on page 10.

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    Weights from b tagging efficiency ratios as functions of the five-jet invariant mass in 2018 data for the high-mass selection,...

  • Figure 3d

    Data from Figure 3, located on page 10.

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    Weights from b tagging efficiency ratios as functions of the five-jet invariant mass in 2018 data for the high-mass selection,...

  • Figure 4a

    Data from Figure 4, located on page 11.

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    The five-jet invariant mass distribution in the tH channel (black markers) after the high-mass selection in the QCD multijet 3T...

  • Figure 4b

    Data from Figure 4, located on page 11.

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    The five-jet invariant mass distribution in the tH channel (black markers) after the high-mass selection in the ttbar 2T1L control...

  • Figure 4c

    Data from Figure 4, located on page 11.

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    The five-jet invariant mass distribution in the tH channel (black markers) after the high-mass selection in the 3M signal region...

  • Figure 5a and 12a Background

    Data from Figure 5, located on page 13.

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    Background: Five-jet invariant mass distributions after a background-only fit (blue histogram) to the complete dataset (black markers) in the 2M1L...

  • Figure 5a and 12aData

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    Data: Five-jet invariant mass distributions after a background-only fit (blue histogram) to the complete dataset (black markers) in the 2M1L...

  • Figure 5a and 12a Signal

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    Signal: Five-jet invariant mass distributions after a background-only fit (blue histogram) to the complete dataset (black markers) in the 2M1L...

  • Figure 5b and 12b Background

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    Background: Five-jet invariant mass distributions after a background-only fit (blue histogram) to the complete dataset (black markers) in the 2M1L...

  • Figure 5b and 12b Data

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    Data: Five-jet invariant mass distributions after a background-only fit (blue histogram) to the complete dataset (black markers) in the 2M1L...

  • Figure 5b and 12b Signal

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    Signal: Five-jet invariant mass distributions after a background-only fit (blue histogram) to the complete dataset (black markers) in the 2M1L...

  • Figure 5c and 12c Background

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    Background: Five-jet invariant mass distributions after a background-only fit (blue histogram) to the complete dataset (black markers) in the 3M...

  • Figure 5c and 12c Data

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    Data: Five-jet invariant mass distributions after a background-only fit (blue histogram) to the complete dataset (black markers) in the 3M...

  • Figure 5c and 12c Signal

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    Signal: Five-jet invariant mass distributions after a background-only fit (blue histogram) to the complete dataset (black markers) in the 3M...

  • Figure 5d and 12d Background

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    Background: Five-jet invariant mass distributions after a background-only fit (blue histogram) to the complete dataset (black markers) in the 3M...

  • Figure 5d and 12d Data

    Data from Figure 5, located on page 13.

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    Data: Five-jet invariant mass distributions after a background-only fit (blue histogram) to the complete dataset (black markers) in the 3M...

  • Figure 5d and 12d Signal

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    Signal: Five-jet invariant mass distributions after a background-only fit (blue histogram) to the complete dataset (black markers) in the 3M...

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    Background: Five-jet invariant mass distributions after a background-only fit (blue histogram) to the complete dataset (black markers) in the 3T...

  • Figure 5e and 12e Data

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    Data: Five-jet invariant mass distributions after a background-only fit (blue histogram) to the complete dataset (black markers) in the 3T...

  • Figure 5e and 12e Signal

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    Signal: Five-jet invariant mass distributions after a background-only fit (blue histogram) to the complete dataset (black markers) in the 3T...

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    Background: Five-jet invariant mass distributions after a background-only fit (blue histogram) to the complete dataset (black markers) in the 3T...

  • Figure 5f and 12f Data

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    Data: Five-jet invariant mass distributions after a background-only fit (blue histogram) to the complete dataset (black markers) in the 3T...

  • Figure 5f and 12f Signal

    Data from Figure 5, located on page 13.

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    Signal: Five-jet invariant mass distributions after a background-only fit (blue histogram) to the complete dataset (black markers) in the 3T...

  • Figure 6

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    Observed p-values when considering the tH channel for each year and their combination.

  • Figure 7a

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    Observed and expected 95% CL upper limits on the product of the production cross section for a single VLQ T...

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    Observed and expected 95% CL upper limits on the product of the production cross section for a single VLQ T...

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    Observed and expected 95% CL upper limits on the product of the production cross section for a single VLQ T...

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    Observed and expected 95% CL upper limits on the product of the production cross section for a single VLQ T...

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    Weights from b tagging efficiency ratios as functions of the five-jet invariant mass in 2016 data for the low-mass selection,...

  • Figure 8b

    Data from Figure 8, located on page 22.

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    Weights from b tagging efficiency ratios as functions of the five-jet invariant mass in 2017 data for the low-mass selection,...

  • Figure 8c

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    Weights from b tagging efficiency ratios as functions of the five-jet invariant mass in 2016 data for the low-mass selection,...

  • Figure 8d

    Data from Figure 8, located on page 22.

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    Weights from b tagging efficiency ratios as functions of the five-jet invariant mass in 2017 data for the low-mass selection,...

  • Figure 9a

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    Weights from b tagging efficiency ratios as functions of the five-jet invariant mass in 2016 data for the high-mass selection,...

  • Figure 9b

    Data from Figure 9, located on page 23.

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    Weights from b tagging efficiency ratios as functions of the five-jet invariant mass in 2017 data for the high-mass selection,...

  • Figure 9c

    Data from Figure 9, located on page 23.

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    Weights from b tagging efficiency ratios as functions of the five-jet invariant mass in 2016 data for the high-mass selection,...

  • Figure 9d

    Data from Figure 9, located on page 23.

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    Weights from b tagging efficiency ratios as functions of the five-jet invariant mass in 2017 data for the high-mass selection,...

  • Figure 10a and 13a Background

    Data from Figure 10, located on page 24.

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    Background: Five-jet invariant mass distributions after a background-only fit (blue histogram) to the complete dataset (black markers) in the 2M1L...

  • Figure 10a and 13a Data

    Data from Figure 10, located on page 24.

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    Data: Five-jet invariant mass distributions after a background-only fit (blue histogram) to the complete dataset (black markers) in the 2M1L...

  • Figure 10a and 13a Signal

    Data from Figure 10, located on page 24.

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    Signal: Five-jet invariant mass distributions after a background-only fit (blue histogram) to the complete dataset (black markers) in the 2M1L...

  • Figure 10b and 13b Background

    Data from Figure 10, located on page 24.

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    Background: Five-jet invariant mass distributions after a background-only fit (blue histogram) to the complete dataset (black markers) in the 2M1L...

  • Figure 10b and 13b Data

    Data from Figure 10, located on page 24.

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    Data: Five-jet invariant mass distributions after a background-only fit (blue histogram) to the complete dataset (black markers) in the 2M1L...

  • Figure 10b and 13b Signal

    Data from Figure 10, located on page 24.

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    Signal: Five-jet invariant mass distributions after a background-only fit (blue histogram) to the complete dataset (black markers) in the 2M1L...

  • Figure 10c and 13c Background

    Data from Figure 10, located on page 24.

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    Background: Five-jet invariant mass distributions after a background-only fit (blue histogram) to the complete dataset (black markers) in the 3M...

  • Figure 10c and 13c Data

    Data from Figure 10, located on page 24.

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    Data: Five-jet invariant mass distributions after a background-only fit (blue histogram) to the complete dataset (black markers) in the 3M...

  • Figure 10c and 13c Signal

    Data from Figure 10, located on page 24.

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    Signal: Five-jet invariant mass distributions after a background-only fit (blue histogram) to the complete dataset (black markers) in the 3M...

  • Figure 10d and 13d Background

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    Background: Five-jet invariant mass distributions after a background-only fit (blue histogram) to the complete dataset (black markers) in the 3M...

  • Figure 10d and 13d Data

    Data from Figure 10, located on page 24.

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    Data: Five-jet invariant mass distributions after a background-only fit (blue histogram) to the complete dataset (black markers) in the 3M...

  • Figure 10d and 13d Signal

    Data from Figure 10, located on page 24.

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    Signal: Five-jet invariant mass distributions after a background-only fit (blue histogram) to the complete dataset (black markers) in the 3M...

  • Figure 10e and 13e Background

    Data from Figure 10, located on page 24.

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    Background: Five-jet invariant mass distributions after a background-only fit (blue histogram) to the complete dataset (black markers) in the 3T...

  • Figure 10e and 13e Data

    Data from Figure 10, located on page 24.

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    Data: Five-jet invariant mass distributions after a background-only fit (blue histogram) to the complete dataset (black markers) in the 3T...

  • Figure 10e and 13e Signal

    Data from Figure 10, located on page 24.

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    Signal: Five-jet invariant mass distributions after a background-only fit (blue histogram) to the complete dataset (black markers) in the 3T...

  • Figure 10f and 13f Background

    Data from Figure 10, located on page 24.

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    Background: Five-jet invariant mass distributions after a background-only fit (blue histogram) to the complete dataset (black markers) in the 3T...

  • Figure 10f and 13f Data

    Data from Figure 10, located on page 24.

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    Data: Five-jet invariant mass distributions after a background-only fit (blue histogram) to the complete dataset (black markers) in the 3T...

  • Figure 10f and 13f Signal

    Data from Figure 10, located on page 24.

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    Signal: Five-jet invariant mass distributions after a background-only fit (blue histogram) to the complete dataset (black markers) in the 3T...

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