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Search for resonant $\mathrm{t}\overline{\mathrm{t}}$ production in proton-proton collisions at $\sqrt{s}=13$ TeV

The collaboration
JHEP 04 (2019) 031, 2019.

Abstract
A search for a heavy resonance decaying into a top quark and antiquark ($\mathrm{t\bar{t}}$) pair is performed using proton-proton collisions at $\sqrt{s} =$ 13 TeV. The search uses the data set collected with the CMS detector in 2016, which corresponds to an integrated luminosity of 35.9 fb$^{-1}$. The analysis considers three exclusive final states and uses reconstruction techniques that are optimized for top quarks with high Lorentz boosts, which requires the use of nonisolated leptons and jet substructure techniques. No significant excess of events relative to the expected yield from standard model processes is observed. Upper limits on the production cross section of heavy resonances decaying to a $\mathrm{t\bar{t}}$ pair are calculated. Limits are derived for a leptophobic topcolor Z' resonance with widths of 1, 10, and 30%, relative to the mass of the resonance, and exclude masses up to 3.80, 5.25, and 6.65 TeV, respectively. Kaluza-Klein excitations of the gluon in the Randall-Sundrum model are excluded up to 4.55 TeV. To date, these are the most stringent limits on $\mathrm{t\bar{t}}$ resonances.

• #### Figure 2 ee

Data from Figure 2, located on page 8

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Distributions of $\Delta R_{sum}$ in $\mu\mu$, $ee$, and $e\mu$ events. The contribution expected from a 4 TeV $Z^{\prime}$ boson, with...

• #### Figure 2 em

Data from Figure 2, located on page 8

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Distributions of $\Delta R_{sum}$ in $\mu\mu$, $ee$, and $e\mu$ events. The contribution expected from a 4 TeV $Z^{\prime}$ boson, with...

• #### Figure 2 mm

Data from Figure 2, located on page 8

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Distributions of $\Delta R_{sum}$ in $\mu\mu$, $ee$, and $e\mu$ events. The contribution expected from a 4 TeV $Z^{\prime}$ boson, with...

• #### Figure 3 WJets_TMVA_response_ele_01top_chi2_mttbar

Data from Figure 3, located on page 9

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W+jets BDT distributions in the muon and electron single-lepton channel. The SR is defined as events with W+jets BDT >=...

• #### Figure 3 WJets_TMVA_response_mu_01top_chi2_mttbar

Data from Figure 3, located on page 9

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W+jets BDT distributions in the muon and electron single-lepton channel. The SR is defined as events with W+jets BDT >=...

• #### Figure 4 btag6

Data from Figure 4, located on page 11

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Dijet rapidity difference $(|\Delta y|)$ for events passing the fully hadronic event selection for all $m_{t\overline{t}}$ and for events with...

• #### Figure 4 mtt2000_btag6

Data from Figure 4, located on page 11

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Dijet rapidity difference $(|\Delta y|)$ for events passing the fully hadronic event selection for all $m_{t\overline{t}}$ and for events with...

• #### Figure 6 topjet_pt_ele_01top

Data from Figure 6, located on page 13

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Distributions of $p_{T}$ and $m_{SD}$ for the W+jets background in the muon and electron channels using the W+jets mistag CR.

• #### Figure 6 topjet_pt_mu_01top

Data from Figure 6, located on page 13

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Distributions of $p_{T}$ and $m_{SD}$ for the W+jets background in the muon and electron channels using the W+jets mistag CR.

• #### Figure 6 toppuppijet_Msdp_matched_ele_01top

Data from Figure 6, located on page 13

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Distributions of $p_{T}$ and $m_{SD}$ for the W+jets background in the muon and electron channels using the W+jets mistag CR.

• #### Figure 6 toppuppijet_Msdp_matched_mu_01top

Data from Figure 6, located on page 13

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Distributions of $p_{T}$ and $m_{SD}$ for the W+jets background in the muon and electron channels using the W+jets mistag CR.

• #### Figure 5 mtt2017_dilep_1ee

Data from Figure 5, located on page 12

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Distributions of $S_{T}$ in the background-enriched CR for $\mu\mu$, $ee$, and $e\mu$ subchannels.

• #### Figure 5 mtt2017_dilep_1em

Data from Figure 5, located on page 12

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Distributions of $S_{T}$ in the background-enriched CR for $\mu\mu$, $ee$, and $e\mu$ subchannels.

• #### Figure 5 mtt2017_dilep_1mm

Data from Figure 5, located on page 12

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Distributions of $S_{T}$ in the background-enriched CR for $\mu\mu$, $ee$, and $e\mu$ subchannels.

• #### Figure 8 mtt2017_dilep_2ee

Data from Figure 8, located on page 20

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Distributions of ST for the $\mu\mu$, $ee$, and $e\mu$ SRs in the boosted and nonboosted regions.

• #### Figure 8 mtt2017_dilep_2em

Data from Figure 8, located on page 20

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Distributions of ST for the $\mu\mu$, $ee$, and $e\mu$ SRs in the boosted and nonboosted regions.

• #### Figure 8 mtt2017_dilep_2mm

Data from Figure 8, located on page 20

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Distributions of ST for the $\mu\mu$, $ee$, and $e\mu$ SRs in the boosted and nonboosted regions.

• #### Figure 8 mtt2017_dilep_3ee

Data from Figure 8, located on page 20

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Distributions of ST for the $\mu\mu$, $ee$, and $e\mu$ SRs in the boosted and nonboosted regions.

• #### Figure 8 mtt2017_dilep_3em

Data from Figure 8, located on page 20

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Distributions of ST for the $\mu\mu$, $ee$, and $e\mu$ SRs in the boosted and nonboosted regions.

• #### Figure 8 mtt2017_dilep_3mm

Data from Figure 8, located on page 20

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Distributions of ST for the $\mu\mu$, $ee$, and $e\mu$ SRs in the boosted and nonboosted regions.

• #### Figure 10 mtt2017_ljets_1e

Data from mtt2017_ljets_1e

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Distributions of $m_{t\overline{t}}$ for the single-lepton channel CR1 and CR2 forthe muon and electron categories.

• #### Figure 10 mtt2017_ljets_2e

Data from mtt2017_ljets_2e

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Distributions of $m_{t\overline{t}}$ for the single-lepton channel CR1 and CR2 forthe muon and electron categories.

• #### Figure 9 mtt2017_ljets_3e

Data from Figure 9, located on page 21

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Distributions of $m_{t\overline{t}}$ for the single-lepton channel SRs for the muon and electron categories with and without t tagging

• #### Figure 9 mtt2017_ljets_4e

Data from Figure 9, located on page 21

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Distributions of $m_{t\overline{t}}$ for the single-lepton channel SRs for the muon and electron categories with and without t tagging

• #### Figure 10 mtt2017_ljets_1m

Data from mtt2017_ljets_1m

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Distributions of $m_{t\overline{t}}$ for the single-lepton channel CR1 and CR2 forthe muon and electron categories.

• #### Figure 10 mtt2017_ljets_2m

Data from mtt2017_ljets_2m

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Distributions of $m_{t\overline{t}}$ for the single-lepton channel CR1 and CR2 forthe muon and electron categories.

• #### Figure 9 mtt2017_ljets_3m

Data from Figure 9, located on page 21

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Distributions of $m_{t\overline{t}}$ for the single-lepton channel SRs for the muon and electron categories with and without t tagging

• #### Figure 9 mtt2017_ljets_4m

Data from Figure 9, located on page 21

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Distributions of $m_{t\overline{t}}$ for the single-lepton channel SRs for the muon and electron categories with and without t tagging

• #### Figure 11 0

Data from Figure 11, located on page 23

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Distributions of $m_{t\overline{t}}$ for the fully hadronic channel SR categories, used to extract the final results.

• #### Figure 11 1

Data from Figure 11, located on page 23

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Distributions of $m_{t\overline{t}}$ for the fully hadronic channel SR categories, used to extract the final results.

• #### Figure 11 2

Data from Figure 11, located on page 23

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Distributions of $m_{t\overline{t}}$ for the fully hadronic channel SR categories, used to extract the final results.

• #### Figure 11 3

Data from Figure 11, located on page 23

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Distributions of $m_{t\overline{t}}$ for the fully hadronic channel SR categories, used to extract the final results.

• #### Figure 11 4

Data from Figure 11, located on page 23

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Distributions of $m_{t\overline{t}}$ for the fully hadronic channel SR categories, used to extract the final results.

• #### Figure 11 5

Data from Figure 11, located on page 23

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Distributions of $m_{t\overline{t}}$ for the fully hadronic channel SR categories, used to extract the final results.