Search for pair production of vector-like quarks in leptonic final states in proton-proton collisions at $\sqrt{s}$ = 13 TeV

The CMS collaboration
JHEP 07 (2023) 020, 2023.

Abstract (data abstract)
A search is presented for vector-like T and B quark-antiquark pairs produced in proton-proton collisions at a center-of-mass energy of 13 TeV. Data were collected by the CMS experiment in 2016–2018, with an integrated luminosity of 138/fb. Events are separated into single-lepton, same-sign dilepton, and multi-lepton channels. The single-lepton channel uses a multilayer neural network and jet identification techniques to select signal events, while the same-sign dilepton and multilepton channels rely on the high-energy signature of the signal to distinguish it from rare standard model backgrounds. The data are consistent with standard model background predictions, and the production of vector-like quark pairs is excluded at 95% confidence level for T quark masses up to 1.54 TeV and B quark masses up to 1.56 TeV, depending on the branching fractions assumed, with maximal sensitivity to decay modes that include multiple top quarks. These are the strongest limits to date for TT production, excluding masses below 1.47 TeV for all decays to third generation quarks, as well as for BB production with B quark decays to tW.

  • Figure 2a

    Data from Figure 2 (left), located on page 9

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    Distribution of ST in the training region for the $T\overline{T}$ MLP. The observed data are shown along with the predicted...

  • Figure 2b

    Data from Figure 2 (right), located on page 9

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    Distribution of the leading jet’s DEEPAK8 light quark or gluon score in the training region for the $T\overline{T}$ MLP. The...

  • Figure 3a

    Data from Figure 3 (left), located on page 10

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    Distribution of the MLP T quark score in the SR for the $T\overline{T}$ search. The observed data, predicted $T\overline{T}$ signal...

  • Figure 3b

    Data from Figure 3 (right), located on page 10

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    Distribution of the MLP W+jets score in the CRs for the $T\overline{T}$ search. The observed data, predicted $T\overline{T}$ signal with...

  • Figure 4a

    Data from Figure 4 (left), located on page 11

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    Distribution of DeepAK8 jet tags in the DeepAK8 CR of the $T\overline{T}$ search. The observed data are shown using black...

  • Figure 4b

    Data from Figure 4 (right), located on page 11

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    Distribution of HT in the W+jets CR of the $T\overline{T}$ search. The observed data are shown using black markers, $T\overline{T}$...

  • Figure 4c

    Data from Figure 4 (lower), located on page 11

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    Distribution of HT in the $T\overline{T}$ CR of the $T\overline{T}$ search. The observed data are shown using black markers, $T\overline{T}$...

  • Table 2 $T\overline{T}$

    Data from upper part of Table 2, located on Page 12

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    Numbers of predicted and observed CR events in 2016--2018 data for the $T\overline{T}$ signal hypotheses in the single-lepton channel, after...

  • Table 2 $B\overline{B}$

    Data from lower part of Table 2, located on Page 12

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    Numbers of predicted and observed CR events in 2016--2018 data for the $B\overline{B}$ signal hypotheses in the single-lepton channel, after...

  • Table 3

    Data from Table 3, located on Page 14

    10.17182/hepdata.129875.v1/t10

    Numbers of predicted and observed CR events in 2017--2018 data in the same-sign dilepton channel, after a background-only fit to...

  • Figure 5a

    Data from Figure 5 (left), located on page 15

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    Distribution of lepton $p_T$ in 2017 in the multilepton channel nonprompt lepton control region for all flavor categories, evaluated with...

  • Figure 5b

    Data from Figure 5 (right), located on page 15

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    Distribution of lepton $p_T$ in 2018 in the multilepton channel nonprompt lepton control region for all flavor categories, evaluated with...

  • Table 4

    Data from Table 4, located on Page 16

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    Numbers of predicted and observed CR events in 2017--2018 data in the multilepton channel, after a background-only fit to data....

  • Table 7

    Data from Table 7, located on Page 25

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    Numbers of predicted and observed $T\overline{T}$ SR events in 2016--2018 data in the single-lepton channel, after a background-only fit to...

  • Figure 6a1

    Data from Figure 6 (upper left, first bin), located on page 22

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    Distribution of the VLQ score in single-lepton category 1. Observed data is shown using black markers, $T\overline{T}$ signal with mass...

  • Figure 6a2

    Data from Figure 6 (upper left, second bin), located on page 22

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    Distribution of the VLQ score in single-lepton category 2. Observed data is shown using black markers, $T\overline{T}$ signal with mass...

  • Figure 6b

    Data from Figure 6 (upper middle), located on page 22

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    Distribution of the VLQ score in single-lepton category 3. Observed data is shown using black markers, $T\overline{T}$ signal with mass...

  • Figure 6c

    Data from Figure 6 (upper right), located on page 22

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    Distribution of the VLQ score in single-lepton category 4. Observed data is shown using black markers, $T\overline{T}$ signal with mass...

  • Figure 6d

    Data from Figure 6 (2nd row left), located on page 22

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    Distribution of the VLQ score in single-lepton category 5. Observed data is shown using black markers, $T\overline{T}$ signal with mass...

  • Figure 6e

    Data from Figure 6 (2nd row middle), located on page 22

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    Distribution of the VLQ score in single-lepton category 6. Observed data is shown using black markers, $T\overline{T}$ signal with mass...

  • Figure 6f

    Data from Figure 6 (2nd row right), located on page 22

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    Distribution of the VLQ score in single-lepton category 7. Observed data is shown using black markers, $T\overline{T}$ signal with mass...

  • Figure 6g

    Data from Figure 6 (3rd row left), located on page 22

    10.17182/hepdata.129875.v1/t22

    Distribution of the VLQ score in single-lepton category 8. Observed data is shown using black markers, $T\overline{T}$ signal with mass...

  • Figure 6h

    Data from Figure 6 (3rd row middle), located on page 22

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    Distribution of the VLQ score in single-lepton category 9. Observed data is shown using black markers, $T\overline{T}$ signal with mass...

  • Figure 6i

    Data from Figure 6 (3rd row right), located on page 22

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    Distribution of the VLQ score in single-lepton category 10. Observed data is shown using black markers, $T\overline{T}$ signal with mass...

  • Figure 6j

    Data from Figure 6 (lower left), located on page 22

    10.17182/hepdata.129875.v1/t25

    Distribution of the VLQ score in single-lepton category 11. Observed data is shown using black markers, $T\overline{T}$ signal with mass...

  • Figure 6k

    Data from Figure 6 (lower right), located on page 22

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    Distribution of the VLQ score in single-lepton category 12. Observed data is shown using black markers, $T\overline{T}$ signal with mass...

  • Figure 7a

    Data from Figure 7 (left), located on page 23

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    Distribution of $H_T^{\mathrm{lep}}$ in the same-sign dilepton signal region for $ee$ category. Data from 2017 and 2018 is shown using...

  • Figure 7b

    Data from Figure 7 (right), located on page 23

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    Distribution of $H_T^{\mathrm{lep}}$ in the same-sign dilepton signal region for $e\mu$ category. Data from 2017 and 2018 is shown using...

  • Figure 7c

    Data from Figure 7 (lower), located on page 23

    10.17182/hepdata.129875.v1/t29

    Distribution of $H_T^{\mathrm{lep}}$ in the same-sign dilepton signal region for $\mu\mu$ category. Data from 2017 and 2018 is shown using...

  • Figure 8a

    Data from Figure 8 (top left), located on page 24

    10.17182/hepdata.129875.v1/t30

    Distribution of $S_T$ in the multilepton signal region for $eee$ category. Data from 2017 and 2018 is shown using black...

  • Figure 8b

    Data from Figure 8 (top right), located on page 24

    10.17182/hepdata.129875.v1/t31

    Distribution of $S_T$ in the multilepton signal region for $ee\mu$ category. Data from 2017 and 2018 is shown using black...

  • Figure 8c

    Data from Figure 8 (bottom left), located on page 24

    10.17182/hepdata.129875.v1/t32

    Distribution of $S_T$ in the multilepton signal region for $e\mu\mu$ category. Data from 2017 and 2018 is shown using black...

  • Figure 8d

    Data from Figure 8 (bottom right), located on page 24

    10.17182/hepdata.129875.v1/t33

    Distribution of $S_T$ in the multilepton signal region for $\mu\mu\mu$ category. Data from 2017 and 2018 is shown using black...

  • Table 8

    Data from Table 8, located on Page 26

    10.17182/hepdata.129875.v1/t34

    Numbers of predicted and observed $B\overline{B}$ SR events in 2016--2018 data in the single-lepton channel, after a background-only fit to...

  • Table 9

    Data from Table 9, located on Page 26

    10.17182/hepdata.129875.v1/t35

    Numbers of predicted and observed SR events in 2017--2018 data in the same-sign dilepton channel, after a background-only fit to...

  • Table 10

    Data from Table 10, located on Page 27

    10.17182/hepdata.129875.v1/t36

    Numbers of predicted and observed SR events in 2017--2018 data in the multilepton channel, after a background-only fit to data....

  • Table 11 $T\overline{T}$

    Data from upper part of Table 11, located on Page 27

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    Expected and observed lower limits on the VLT quark masses.

  • Table 11 $B\overline{B}$

    Data from lower part of Table 11, located on Page 27

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    Expected and observed lower limits on the VLB quark masses.

  • Figure 9a

    Data from Figure 9 (top left), located on page 28

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    Expected 95% CL upper limits on $T\overline{T}$ production cross sections for the singlet combination.

  • Figure 9b

    Data from Figure 9 (top right), located on page 28

    10.17182/hepdata.129875.v1/t40

    Expected 95% CL upper limits on $T\overline{T}$ production cross sections for the doublet combination.

  • Figure 9c

    Data from Figure 9 (bottom left), located on page 28

    10.17182/hepdata.129875.v1/t41

    Expected 95% CL upper limits on $B\overline{B}$ production cross sections for the singlet combination.

  • Figure 9d

    Data from Figure 9 (bottom right), located on page 28

    10.17182/hepdata.129875.v1/t42

    Expected 95% CL upper limits on $B\overline{B}$ production cross sections for the doublet combination.

  • Figure 10a

    Data from Figure 10 (upper left), located on page 29

    10.17182/hepdata.129875.v1/t43

    The 95% CL expected lower mass limits on pair-produced T quark masses as functions of their branching ratios to W...

  • Figure 10b

    Data from Figure 10 (upper right), located on page 29

    10.17182/hepdata.129875.v1/t44

    The 95% CL observed lower mass limits on pair-produced T quark masses as functions of their branching ratios to W...

  • Figure 10c

    Data from Figure 10 (bottom left), located on page 29

    10.17182/hepdata.129875.v1/t45

    The 95% CL expected lower mass limits on pair-produced B quark masses as functions of their branching ratios to W...

  • Figure 10d

    Data from Figure 10 (bottom right), located on page 29

    10.17182/hepdata.129875.v1/t46

    The 95% CL observed lower mass limits on pair-produced B quark masses as functions of their branching ratios to W...

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