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| CMS-PAS-B2G-22-001 | ||
| A search for a heavy resonance decaying to a top quark and a new scalar in the boosted all-hadronic final state at $ \sqrt{s}= $ 13 TeV | ||
| CMS Collaboration | ||
| 2025-07-28 | ||
| Abstract: A search for a heavy resonance decaying to a top quark and a neutral scalar boson $ \phi $ in the all-hadronic final state is presented, where the $ \phi $ boson candidate is identified by its decay into a bottom quark-antiquark pair. The search is focused on final states in which the decay products of the highly Lorentz-boosted top quark and $ \phi $ boson are each expected to be reconstructed as single, large-radius jets with distinct substructures. The analysis is performed using data from proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 138 fb$ ^{-1} $ recorded by the CMS experiment at the CERN LHC in 2016--2018. The production of a vector-like top quark, $ \mathrm{T}^\prime $, a weak-isospin singlet, is used as a benchmark model and limits are set at the 95% confidence level on the cross section for a heavy resonance decaying to a top quark and $ \phi $ boson. For the case where the neutral scalar is a standard model Higgs boson and the $ \mathrm{T}^\prime $ quark width is 5% of its mass, $ \mathrm{T}^\prime $ quark masses below 1.2 TeV are excluded. | ||
| Links: CDS record (PDF) ; CADI line (restricted) ; | ||
| Figures & Tables | Summary | Additional Figures | References | CMS Publications |
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| Figures | |
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Figure 1:
Feynman diagram showing the electroweak production of a single top quark partner $ \mathrm{T}^\prime $ at leading order, produced in association with a bottom quark and decaying to a top quark and a new scalar $ \phi $. |
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Figure 2:
Selection criteria on the top quark and $ \phi $ boson candidate jets for the three analysis regions and their corresponding Pass and Fail tagging regions. |
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Figure 3:
Post-fit distributions of data and predicted background in the $ \mathrm{SR} $ under the background-only hypothesis, projected onto the $ m_{\phi}^{\mathrm{rec}} $ (left) and $ m_{\mathrm{T}^\prime}^{\mathrm{rec}} $ (right) axes. The top row shows the distributions in the $ \text{T}_\text{Xbb} $ Fail tagging region, $ \mathrm{SR}_{\mathrm{F}} $, and the bottom in the $ \text{T}_\text{Xbb} $ Pass tagging region, $ \mathrm{SR}_{\mathrm{P}} $. A $ m_{\phi}= $ 175, $ m_{\mathrm{T}^\prime}= $ 1100 GeV signal sample normalized to a cross section of 1 fb is overlaid for visualization. |
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Figure 3-a:
Post-fit distributions of data and predicted background in the $ \mathrm{SR} $ under the background-only hypothesis, projected onto the $ m_{\phi}^{\mathrm{rec}} $ (left) and $ m_{\mathrm{T}^\prime}^{\mathrm{rec}} $ (right) axes. The top row shows the distributions in the $ \text{T}_\text{Xbb} $ Fail tagging region, $ \mathrm{SR}_{\mathrm{F}} $, and the bottom in the $ \text{T}_\text{Xbb} $ Pass tagging region, $ \mathrm{SR}_{\mathrm{P}} $. A $ m_{\phi}= $ 175, $ m_{\mathrm{T}^\prime}= $ 1100 GeV signal sample normalized to a cross section of 1 fb is overlaid for visualization. |
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Figure 3-b:
Post-fit distributions of data and predicted background in the $ \mathrm{SR} $ under the background-only hypothesis, projected onto the $ m_{\phi}^{\mathrm{rec}} $ (left) and $ m_{\mathrm{T}^\prime}^{\mathrm{rec}} $ (right) axes. The top row shows the distributions in the $ \text{T}_\text{Xbb} $ Fail tagging region, $ \mathrm{SR}_{\mathrm{F}} $, and the bottom in the $ \text{T}_\text{Xbb} $ Pass tagging region, $ \mathrm{SR}_{\mathrm{P}} $. A $ m_{\phi}= $ 175, $ m_{\mathrm{T}^\prime}= $ 1100 GeV signal sample normalized to a cross section of 1 fb is overlaid for visualization. |
png pdf |
Figure 3-c:
Post-fit distributions of data and predicted background in the $ \mathrm{SR} $ under the background-only hypothesis, projected onto the $ m_{\phi}^{\mathrm{rec}} $ (left) and $ m_{\mathrm{T}^\prime}^{\mathrm{rec}} $ (right) axes. The top row shows the distributions in the $ \text{T}_\text{Xbb} $ Fail tagging region, $ \mathrm{SR}_{\mathrm{F}} $, and the bottom in the $ \text{T}_\text{Xbb} $ Pass tagging region, $ \mathrm{SR}_{\mathrm{P}} $. A $ m_{\phi}= $ 175, $ m_{\mathrm{T}^\prime}= $ 1100 GeV signal sample normalized to a cross section of 1 fb is overlaid for visualization. |
png pdf |
Figure 3-d:
Post-fit distributions of data and predicted background in the $ \mathrm{SR} $ under the background-only hypothesis, projected onto the $ m_{\phi}^{\mathrm{rec}} $ (left) and $ m_{\mathrm{T}^\prime}^{\mathrm{rec}} $ (right) axes. The top row shows the distributions in the $ \text{T}_\text{Xbb} $ Fail tagging region, $ \mathrm{SR}_{\mathrm{F}} $, and the bottom in the $ \text{T}_\text{Xbb} $ Pass tagging region, $ \mathrm{SR}_{\mathrm{P}} $. A $ m_{\phi}= $ 175, $ m_{\mathrm{T}^\prime}= $ 1100 GeV signal sample normalized to a cross section of 1 fb is overlaid for visualization. |
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Figure 4:
2D pulls in the $ m_{\phi}^{\mathrm{rec}} $ and $ m_{\mathrm{T}^\prime}^{\mathrm{rec}} $ observables in the $ \text{T}_\text{Xbb} $ Pass tagging region of the $ \mathrm{SR} $ after the maximum likelihood fit to the data. |
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Figure 5:
Median expected (left) and observed (right) upper limits at the 95% CL on the product of the production cross section for the $ \mathrm{T}^\prime \to t\phi $ channel and the branching fraction $ \mathcal{B}(\mathrm{t}\to \mathrm{b}\mathrm{q}\bar{\mathrm{q}}) $ as a function of $ (m_{\mathrm{T}^\prime},m_{\phi}) $. |
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Figure 5-a:
Median expected (left) and observed (right) upper limits at the 95% CL on the product of the production cross section for the $ \mathrm{T}^\prime \to t\phi $ channel and the branching fraction $ \mathcal{B}(\mathrm{t}\to \mathrm{b}\mathrm{q}\bar{\mathrm{q}}) $ as a function of $ (m_{\mathrm{T}^\prime},m_{\phi}) $. |
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Figure 5-b:
Median expected (left) and observed (right) upper limits at the 95% CL on the product of the production cross section for the $ \mathrm{T}^\prime \to t\phi $ channel and the branching fraction $ \mathcal{B}(\mathrm{t}\to \mathrm{b}\mathrm{q}\bar{\mathrm{q}}) $ as a function of $ (m_{\mathrm{T}^\prime},m_{\phi}) $. |
png pdf |
Figure 6:
Upper limits at the 95% CL on the product of the production cross section $ \mathrm{p}\mathrm{p}\to\mathrm{T}^\prime\to\mathrm{t}\mathrm{H} $ and branching fraction $ \mathcal{B}(\mathrm{t} \to \mathrm{b}\mathrm{q}\bar{\mathrm{q}},\, \mathrm{H}\to\mathrm{b}\overline{\mathrm{b}}) $ as a function of the $ \mathrm{T}^\prime $ mass for fixed $ m_{\phi}=m_{\mathrm{H}}= $ 125 GeV. The solid red (blue) curves indicate the theoretical cross sections for the singlet $ \mathrm{T}^\prime $ quark model assuming its width is 1% (5%) of its mass. |
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Figure 7:
Upper limits at the 95% CL on the product of the production cross section for the $ \mathrm{T}^\prime \to t\phi $ channel and the branching fraction $ \mathcal{B}(\mathrm{t}\to \mathrm{b}\mathrm{q}\bar{\mathrm{q}}) $ as a function of $ m_{\mathrm{T}^\prime} $ for all values of $ m_{\phi} $ with official simulations. |
| Tables | |
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Table 1:
The coupling $ \kappa $ to the H, Z, and W bosons, reduced cross section $ \hat\sigma $ as defined in Ref. [28], and total cross section $ \sigma $ for singlet $ \mathrm{T}^\prime $ quarks with widths of 1% and 5% and mass $ m_{\mathrm{Q}} $. For the singlet scenario, these cross sections are multiplied by the branching fraction $ \mathcal{B}(\mathrm{T}^\prime \to \mathrm{t}\mathrm{H}) $, taken to be 25%. |
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Table 2:
Sources of systematic uncertainty that are taken into account in the statistical analysis. The correlation of the uncertainty between the data-taking years, and the list of simulated processes affected by the uncertainty are also given. |
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Table 3:
Run 2 luminosity uncertainty correlation scheme |
| Summary |
| A search for the single production of a vector-like top quark partner $ \mathrm{T}^\prime $ decaying to the third generation SM top quark and a neutral scalar boson $ \phi $ in the fully-hadronic final state is presented using proton-proton collision data recorded by the CMS experiment at $ \sqrt{s}= $ 13 TeV and corresponding to a total integrated luminosity of 138 fb$ ^{-1} $. The hadronic decay products of the top quark and $ \phi $ boson are expected to be highly Lorentz-boosted from the decay of the massive $ \mathrm{T}^\prime $ resonance, resulting in two large-radius jets in the final state. Upper limits at 95% confidence level are set on the product of the production cross section and branching fraction for the decay $ \mathrm{T}^\prime\to \mathrm{t}\phi $, representing the first results for the decay $ \mathrm{T}^\prime \to \mathrm{t}(\mathrm{b}\mathrm{q}\overline{\mathrm{q}})\phi(\mathrm{b}\overline{\mathrm{b}}) $ by the CMS collaboration. For the case where the neutral scalar is the standard model Higgs boson, upper limits are set on the product of the production cross section and the $ \mathrm{T}^\prime \to \mathrm{t}\mathrm{H} $ branching fraction between 300 to 4.6 fb at 95% CL for $ \mathrm{T}^\prime $ quark masses between 0.8 and 3 TeV. They exclude $ \mathrm{T}^\prime $ quark masses below 1.2 TeV assuming the $ \mathrm{T}^\prime $ quark is a weak-isospin singlet with a resonance width 5% of its mass. For other $ \phi $ boson masses, upper limits as low as 1.3 fb are set. |
| Additional Figures | |
png pdf |
Additional Figure 1:
Post-fit distributions of data and predicted background in the $ \mathrm{SR} $ under the background-only hypothesis, projected onto the $ m_{\phi}^{\mathrm{rec}} $ axis for events in the range 800 $ < m_{\mathrm{T}^\prime}^{\mathrm{rec}} < $ 900 GeV. |
png pdf |
Additional Figure 2:
Post-fit distributions of data and predicted background in the $ \mathrm{SR} $ under the background-only hypothesis, projected onto the $ m_{\phi}^{\mathrm{rec}} $ axis for events in the range 900 $ < m_{\mathrm{T}^\prime}^{\mathrm{rec}} < $ 1000 GeV. |
png pdf |
Additional Figure 3:
Post-fit distributions of data and predicted background in the $ \mathrm{SR} $ under the background-only hypothesis, projected onto the $ m_{\phi}^{\mathrm{rec}} $ axis for events in the range 1000 $ < m_{\mathrm{T}^\prime}^{\mathrm{rec}} < $ 1100 GeV. |
png pdf |
Additional Figure 4:
Post-fit distributions of data and predicted background in the $ \mathrm{SR} $ under the background-only hypothesis, projected onto the $ m_{\phi}^{\mathrm{rec}} $ axis for events in the range 1100 $ < m_{\mathrm{T}^\prime}^{\mathrm{rec}} < $ 1200 GeV. |
png pdf |
Additional Figure 5:
Post-fit distributions of data and predicted background in the $ \mathrm{SR} $ under the background-only hypothesis, projected onto the $ m_{\phi}^{\mathrm{rec}} $ axis for events in the range 1200 $ < m_{\mathrm{T}^\prime}^{\mathrm{rec}} < $ 1300 GeV. |
png pdf |
Additional Figure 6:
Post-fit distributions of data and predicted background in the $ \mathrm{SR} $ under the background-only hypothesis, projected onto the $ m_{\phi}^{\mathrm{rec}} $ axis for events in the range 1300 $ < m_{\mathrm{T}^\prime}^{\mathrm{rec}} < $ 1400 GeV. |
png pdf |
Additional Figure 7:
Post-fit distributions of data and predicted background in the $ \mathrm{SR} $ under the background-only hypothesis, projected onto the $ m_{\phi}^{\mathrm{rec}} $ axis for events in the range 1400 $ < m_{\mathrm{T}^\prime}^{\mathrm{rec}} < $ 1500 GeV. |
png pdf |
Additional Figure 8:
Post-fit distributions of data and predicted background in the $ \mathrm{SR} $ under the background-only hypothesis, projected onto the $ m_{\phi}^{\mathrm{rec}} $ axis for events in the range 1500 $ < m_{\mathrm{T}^\prime}^{\mathrm{rec}} < $ 1700 GeV. |
png pdf |
Additional Figure 9:
Post-fit distributions of data and predicted background in the $ \mathrm{SR} $ under the background-only hypothesis, projected onto the $ m_{\phi}^{\mathrm{rec}} $ axis for events in the range 1700 $ < m_{\mathrm{T}^\prime}^{\mathrm{rec}} < $ 2000 GeV. |
png pdf |
Additional Figure 10:
Post-fit distributions of data and predicted background in the $ \mathrm{SR} $ under the background-only hypothesis, projected onto the $ m_{\phi}^{\mathrm{rec}} $ axis for events in the range 2000 $ < m_{\mathrm{T}^\prime}^{\mathrm{rec}} < $ 3500 GeV. |
png pdf |
Additional Figure 11:
Upper limits at the 95% CL on the product of the production cross section $ \mathrm{pp}\to\mathrm{T}^\prime\to\mathrm{t}\mathrm{H} $ and branching fraction $ \mathcal{B}(\mathrm{t} \to \mathrm{b}\mathrm{q}\bar{\mathrm{q}},\, \mathrm{H}\to\mathrm{b}\overline{\mathrm{b}}) $ as a function of the $ \mathrm{T}^\prime $ mass for fixed $ m_{\phi}=m_{\mathrm{H}}= $ 125 GeV, presented for the purpose of direct comparison with the experimental limits from CMS-PAS-B2G-23-009 [59], a search for single production of a vector-like $ \mathrm{T}^\prime $ quark decaying to a top quark and neutral scalar boson in the lepton+jets final state. The solid red (blue) curves indicate the theoretical cross sections for the singlet $ \mathrm{T}^\prime $ quark model assuming its width is 1% (5%) of its mass, taken from Ref. [59]. |
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