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| CMS-PAS-B2G-17-015 | ||
| Search for a heavy resonance decaying to a top quark and a vector-like top quark in the lepton+jets final state | ||
| CMS Collaboration | ||
| July 2018 | ||
| Abstract: A search is presented for a heavy spin-1 resonance Z' decaying to a top quark and a vector-like top quark T in the lepton+jets final state. The search is performed using a data set of proton-proton collisions at a centre-of-mass energy of 13 TeV corresponding to an integrated luminosity of 35.9 fb$^{-1}$ as recorded by the CMS experiment at the CERN LHC in the year 2016. The analysis is optimised for final states arising from the T decay modes to a top quark and a Higgs or a Z boson ($\mathrm{T} \to \mathrm{Ht},\,\mathrm{Zt}$). The event selection makes use of resolved and boosted top quark decays, as well as boosted decays of H bosons and heavy gauge bosons using jet substructure techniques. No signficant deviation from the standard model background expectation is observed. Model-independent exclusion limits on the product of the cross section and branching fraction are presented for various combinations of the Z' resonance mass and the vector-like T quark mass. In a benchmark model with extra dimensions, masses of the Z' resonance less than 2.4 TeV are excluded. These limits represent the most stringent limits to date for the decay mode $\mathrm{Z}^\prime \to \mathrm{tT} \to \mathrm{tHt}$. | ||
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Links:
CDS record (PDF) ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, EPJC 79 (2019) 208. The superseded preliminary plots can be found here. |
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| Figures | |
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Figure 1:
Feynman diagram for the production of a spin-1 resonance Z' and its decay, along with the possible decays of the vector-like quark T. |
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Figure 2:
Distribution of the soft drop mass of jets as reconstructed with the anti-$ {k_{\mathrm {T}}}$ jet algorithm with $R=0.8$ after the selection in data and simulated SM background for the combined lepton+jets channel. The expected signal distribution from various T decay modes is shown for the example mass configuration $ {M_{{{\mathrm {Z}} ^{\prime}}}} = $ 1.5 TeV and $ {M_{{\text {T}}}} = $ 1.2 TeV with a nominal cross section of 1 pb. |
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Figure 3:
Distribution of the $ {\chi ^2} $ discriminator for the combination of both top tag and no top tag categories after the $ {{\mathrm {t}\overline {\mathrm {t}}}} $ reconstruction, combining both lepton channels. The expected signal distribution is shown for various $ {M_{{{\mathrm {Z}} ^{\prime}}}} $ masses for a fixed mass $ {M_{{\text {T}}}} = $ 1.2 TeV in the $ {{\text {T}} \to {\mathrm {H}} {\mathrm {t}}}$ decay channel, each with a nominal cross section of 1 pb. |
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Figure 4-a:
Distribution of the reconstructed Z' boson mass in the $\mu$+jets channel (top) and e+jets channel (bottom) for the $ {{\mathrm {t}\overline {\mathrm {t}}}} $-enriched control region (left) and for the W+jets-enriched region (right). The expected signal distribution is shown for various $ {M_{{{\mathrm {Z}} ^{\prime}}}} $ masses for a fixed mass $ {M_{{\text {T}}}} = $ 1.2 TeV in the $ {{\text {T}} \to {\mathrm {H}} {\mathrm {t}}}$ decay channel, each with a nominal cross section of 1 pb. |
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Figure 4-b:
Distribution of the reconstructed Z' boson mass in the $\mu$+jets channel (top) and e+jets channel (bottom) for the $ {{\mathrm {t}\overline {\mathrm {t}}}} $-enriched control region (left) and for the W+jets-enriched region (right). The expected signal distribution is shown for various $ {M_{{{\mathrm {Z}} ^{\prime}}}} $ masses for a fixed mass $ {M_{{\text {T}}}} = $ 1.2 TeV in the $ {{\text {T}} \to {\mathrm {H}} {\mathrm {t}}}$ decay channel, each with a nominal cross section of 1 pb. |
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Figure 4-c:
Distribution of the reconstructed Z' boson mass in the $\mu$+jets channel (top) and e+jets channel (bottom) for the $ {{\mathrm {t}\overline {\mathrm {t}}}} $-enriched control region (left) and for the W+jets-enriched region (right). The expected signal distribution is shown for various $ {M_{{{\mathrm {Z}} ^{\prime}}}} $ masses for a fixed mass $ {M_{{\text {T}}}} = $ 1.2 TeV in the $ {{\text {T}} \to {\mathrm {H}} {\mathrm {t}}}$ decay channel, each with a nominal cross section of 1 pb. |
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Figure 4-d:
Distribution of the reconstructed Z' boson mass in the $\mu$+jets channel (top) and e+jets channel (bottom) for the $ {{\mathrm {t}\overline {\mathrm {t}}}} $-enriched control region (left) and for the W+jets-enriched region (right). The expected signal distribution is shown for various $ {M_{{{\mathrm {Z}} ^{\prime}}}} $ masses for a fixed mass $ {M_{{\text {T}}}} = $ 1.2 TeV in the $ {{\text {T}} \to {\mathrm {H}} {\mathrm {t}}}$ decay channel, each with a nominal cross section of 1 pb. |
png pdf |
Figure 5-a:
Distribution of the reconstructed resonance mass after the full selection in the $\mu$+jets channel for the data, the expected SM background, and for the signal with different Z' masses for a fixed T mass of 1.2 TeV. In the left (right) column the results in the (no) top tag category are shown. Different rows display the distributions of events accepted by different taggers as well as the signal for the respective T decays: $ {{\mathrm {H}} _{2 {\mathrm {b}}}} $ tagger and $ {{\text {T}} \to {\mathrm {H}} {\mathrm {t}}}$ decay (top), $ {{\mathrm {H}} _{1 {\mathrm {b}}}} $ tagger and $ {{\text {T}} \to {\mathrm {H}} {\mathrm {t}}}$ decay (middle), and $ {\mathrm {Z}} / {\mathrm {W}}$ tagger and $ {{\text {T}} \to {\mathrm {Z}} {\mathrm {t}}}$ decay (bottom). The signal histograms correspond to a nominal cross section of 1 pb. |
png pdf |
Figure 5-b:
Distribution of the reconstructed resonance mass after the full selection in the $\mu$+jets channel for the data, the expected SM background, and for the signal with different Z' masses for a fixed T mass of 1.2 TeV. In the left (right) column the results in the (no) top tag category are shown. Different rows display the distributions of events accepted by different taggers as well as the signal for the respective T decays: $ {{\mathrm {H}} _{2 {\mathrm {b}}}} $ tagger and $ {{\text {T}} \to {\mathrm {H}} {\mathrm {t}}}$ decay (top), $ {{\mathrm {H}} _{1 {\mathrm {b}}}} $ tagger and $ {{\text {T}} \to {\mathrm {H}} {\mathrm {t}}}$ decay (middle), and $ {\mathrm {Z}} / {\mathrm {W}}$ tagger and $ {{\text {T}} \to {\mathrm {Z}} {\mathrm {t}}}$ decay (bottom). The signal histograms correspond to a nominal cross section of 1 pb. |
png pdf |
Figure 5-c:
Distribution of the reconstructed resonance mass after the full selection in the $\mu$+jets channel for the data, the expected SM background, and for the signal with different Z' masses for a fixed T mass of 1.2 TeV. In the left (right) column the results in the (no) top tag category are shown. Different rows display the distributions of events accepted by different taggers as well as the signal for the respective T decays: $ {{\mathrm {H}} _{2 {\mathrm {b}}}} $ tagger and $ {{\text {T}} \to {\mathrm {H}} {\mathrm {t}}}$ decay (top), $ {{\mathrm {H}} _{1 {\mathrm {b}}}} $ tagger and $ {{\text {T}} \to {\mathrm {H}} {\mathrm {t}}}$ decay (middle), and $ {\mathrm {Z}} / {\mathrm {W}}$ tagger and $ {{\text {T}} \to {\mathrm {Z}} {\mathrm {t}}}$ decay (bottom). The signal histograms correspond to a nominal cross section of 1 pb. |
png pdf |
Figure 5-d:
Distribution of the reconstructed resonance mass after the full selection in the $\mu$+jets channel for the data, the expected SM background, and for the signal with different Z' masses for a fixed T mass of 1.2 TeV. In the left (right) column the results in the (no) top tag category are shown. Different rows display the distributions of events accepted by different taggers as well as the signal for the respective T decays: $ {{\mathrm {H}} _{2 {\mathrm {b}}}} $ tagger and $ {{\text {T}} \to {\mathrm {H}} {\mathrm {t}}}$ decay (top), $ {{\mathrm {H}} _{1 {\mathrm {b}}}} $ tagger and $ {{\text {T}} \to {\mathrm {H}} {\mathrm {t}}}$ decay (middle), and $ {\mathrm {Z}} / {\mathrm {W}}$ tagger and $ {{\text {T}} \to {\mathrm {Z}} {\mathrm {t}}}$ decay (bottom). The signal histograms correspond to a nominal cross section of 1 pb. |
png pdf |
Figure 5-e:
Distribution of the reconstructed resonance mass after the full selection in the $\mu$+jets channel for the data, the expected SM background, and for the signal with different Z' masses for a fixed T mass of 1.2 TeV. In the left (right) column the results in the (no) top tag category are shown. Different rows display the distributions of events accepted by different taggers as well as the signal for the respective T decays: $ {{\mathrm {H}} _{2 {\mathrm {b}}}} $ tagger and $ {{\text {T}} \to {\mathrm {H}} {\mathrm {t}}}$ decay (top), $ {{\mathrm {H}} _{1 {\mathrm {b}}}} $ tagger and $ {{\text {T}} \to {\mathrm {H}} {\mathrm {t}}}$ decay (middle), and $ {\mathrm {Z}} / {\mathrm {W}}$ tagger and $ {{\text {T}} \to {\mathrm {Z}} {\mathrm {t}}}$ decay (bottom). The signal histograms correspond to a nominal cross section of 1 pb. |
png pdf |
Figure 5-f:
Distribution of the reconstructed resonance mass after the full selection in the $\mu$+jets channel for the data, the expected SM background, and for the signal with different Z' masses for a fixed T mass of 1.2 TeV. In the left (right) column the results in the (no) top tag category are shown. Different rows display the distributions of events accepted by different taggers as well as the signal for the respective T decays: $ {{\mathrm {H}} _{2 {\mathrm {b}}}} $ tagger and $ {{\text {T}} \to {\mathrm {H}} {\mathrm {t}}}$ decay (top), $ {{\mathrm {H}} _{1 {\mathrm {b}}}} $ tagger and $ {{\text {T}} \to {\mathrm {H}} {\mathrm {t}}}$ decay (middle), and $ {\mathrm {Z}} / {\mathrm {W}}$ tagger and $ {{\text {T}} \to {\mathrm {Z}} {\mathrm {t}}}$ decay (bottom). The signal histograms correspond to a nominal cross section of 1 pb. |
png pdf |
Figure 6-a:
Distribution of the reconstructed resonance mass after the full selection in the e+jets channel for the data, the expected SM background, and for the signal with different Z' masses for a fixed T mass of 1.2 TeV. In the left (right) column the results in the (no) top tag category are shown. Different rows display the distributions of events accepted by different taggers as well as the signal for the respective T decays: $ {{\mathrm {H}} _{2 {\mathrm {b}}}} $ tagger and $ {{\text {T}} \to {\mathrm {H}} {\mathrm {t}}}$ decay (top), $ {{\mathrm {H}} _{1 {\mathrm {b}}}} $ tagger and $ {{\text {T}} \to {\mathrm {H}} {\mathrm {t}}}$ decay (middle), and $ {\mathrm {Z}} / {\mathrm {W}}$ tagger and $ {{\text {T}} \to {\mathrm {Z}} {\mathrm {t}}}$ decay (bottom). The signal histograms correspond to a nominal cross section of 1 pb. |
png pdf |
Figure 6-b:
Distribution of the reconstructed resonance mass after the full selection in the e+jets channel for the data, the expected SM background, and for the signal with different Z' masses for a fixed T mass of 1.2 TeV. In the left (right) column the results in the (no) top tag category are shown. Different rows display the distributions of events accepted by different taggers as well as the signal for the respective T decays: $ {{\mathrm {H}} _{2 {\mathrm {b}}}} $ tagger and $ {{\text {T}} \to {\mathrm {H}} {\mathrm {t}}}$ decay (top), $ {{\mathrm {H}} _{1 {\mathrm {b}}}} $ tagger and $ {{\text {T}} \to {\mathrm {H}} {\mathrm {t}}}$ decay (middle), and $ {\mathrm {Z}} / {\mathrm {W}}$ tagger and $ {{\text {T}} \to {\mathrm {Z}} {\mathrm {t}}}$ decay (bottom). The signal histograms correspond to a nominal cross section of 1 pb. |
png pdf |
Figure 6-c:
Distribution of the reconstructed resonance mass after the full selection in the e+jets channel for the data, the expected SM background, and for the signal with different Z' masses for a fixed T mass of 1.2 TeV. In the left (right) column the results in the (no) top tag category are shown. Different rows display the distributions of events accepted by different taggers as well as the signal for the respective T decays: $ {{\mathrm {H}} _{2 {\mathrm {b}}}} $ tagger and $ {{\text {T}} \to {\mathrm {H}} {\mathrm {t}}}$ decay (top), $ {{\mathrm {H}} _{1 {\mathrm {b}}}} $ tagger and $ {{\text {T}} \to {\mathrm {H}} {\mathrm {t}}}$ decay (middle), and $ {\mathrm {Z}} / {\mathrm {W}}$ tagger and $ {{\text {T}} \to {\mathrm {Z}} {\mathrm {t}}}$ decay (bottom). The signal histograms correspond to a nominal cross section of 1 pb. |
png pdf |
Figure 6-d:
Distribution of the reconstructed resonance mass after the full selection in the e+jets channel for the data, the expected SM background, and for the signal with different Z' masses for a fixed T mass of 1.2 TeV. In the left (right) column the results in the (no) top tag category are shown. Different rows display the distributions of events accepted by different taggers as well as the signal for the respective T decays: $ {{\mathrm {H}} _{2 {\mathrm {b}}}} $ tagger and $ {{\text {T}} \to {\mathrm {H}} {\mathrm {t}}}$ decay (top), $ {{\mathrm {H}} _{1 {\mathrm {b}}}} $ tagger and $ {{\text {T}} \to {\mathrm {H}} {\mathrm {t}}}$ decay (middle), and $ {\mathrm {Z}} / {\mathrm {W}}$ tagger and $ {{\text {T}} \to {\mathrm {Z}} {\mathrm {t}}}$ decay (bottom). The signal histograms correspond to a nominal cross section of 1 pb. |
png pdf |
Figure 6-e:
Distribution of the reconstructed resonance mass after the full selection in the e+jets channel for the data, the expected SM background, and for the signal with different Z' masses for a fixed T mass of 1.2 TeV. In the left (right) column the results in the (no) top tag category are shown. Different rows display the distributions of events accepted by different taggers as well as the signal for the respective T decays: $ {{\mathrm {H}} _{2 {\mathrm {b}}}} $ tagger and $ {{\text {T}} \to {\mathrm {H}} {\mathrm {t}}}$ decay (top), $ {{\mathrm {H}} _{1 {\mathrm {b}}}} $ tagger and $ {{\text {T}} \to {\mathrm {H}} {\mathrm {t}}}$ decay (middle), and $ {\mathrm {Z}} / {\mathrm {W}}$ tagger and $ {{\text {T}} \to {\mathrm {Z}} {\mathrm {t}}}$ decay (bottom). The signal histograms correspond to a nominal cross section of 1 pb. |
png pdf |
Figure 6-f:
Distribution of the reconstructed resonance mass after the full selection in the e+jets channel for the data, the expected SM background, and for the signal with different Z' masses for a fixed T mass of 1.2 TeV. In the left (right) column the results in the (no) top tag category are shown. Different rows display the distributions of events accepted by different taggers as well as the signal for the respective T decays: $ {{\mathrm {H}} _{2 {\mathrm {b}}}} $ tagger and $ {{\text {T}} \to {\mathrm {H}} {\mathrm {t}}}$ decay (top), $ {{\mathrm {H}} _{1 {\mathrm {b}}}} $ tagger and $ {{\text {T}} \to {\mathrm {H}} {\mathrm {t}}}$ decay (middle), and $ {\mathrm {Z}} / {\mathrm {W}}$ tagger and $ {{\text {T}} \to {\mathrm {Z}} {\mathrm {t}}}$ decay (bottom). The signal histograms correspond to a nominal cross section of 1 pb. |
png pdf |
Figure 7-a:
Exclusion limits at 95% CL on the production cross section for various ($ {M_{{{\mathrm {Z}} ^{\prime}}}}, {M_{{\text {T}}}} $) combinations assuming a T branching fraction of 100% in the decay $ {{\text {T}} \to {\mathrm {H}} {\mathrm {t}}}$ (upper left), $ {{\text {T}} \to {\mathrm {Z}} {\mathrm {t}}}$ (upper right), and $ {{\text {T}} \to {\mathrm {W}} {\mathrm {b}}}$ (lower). |
png pdf |
Figure 7-b:
Exclusion limits at 95% CL on the production cross section for various ($ {M_{{{\mathrm {Z}} ^{\prime}}}}, {M_{{\text {T}}}} $) combinations assuming a T branching fraction of 100% in the decay $ {{\text {T}} \to {\mathrm {H}} {\mathrm {t}}}$ (upper left), $ {{\text {T}} \to {\mathrm {Z}} {\mathrm {t}}}$ (upper right), and $ {{\text {T}} \to {\mathrm {W}} {\mathrm {b}}}$ (lower). |
png pdf |
Figure 7-c:
Exclusion limits at 95% CL on the production cross section for various ($ {M_{{{\mathrm {Z}} ^{\prime}}}}, {M_{{\text {T}}}} $) combinations assuming a T branching fraction of 100% in the decay $ {{\text {T}} \to {\mathrm {H}} {\mathrm {t}}}$ (upper left), $ {{\text {T}} \to {\mathrm {Z}} {\mathrm {t}}}$ (upper right), and $ {{\text {T}} \to {\mathrm {W}} {\mathrm {b}}}$ (lower). |
png pdf |
Figure 8-a:
Exclusion limits at 95% CL on the product of the cross section and branching fraction for an example T mass of 1.2 TeV as a function of the resonance mass for two different decay scenarios. Observed and expected limits are compared to the prediction of two different theory benchmark models, the $G^*$ model (left) and the $\rho ^0$ model (right). |
png pdf |
Figure 8-b:
Exclusion limits at 95% CL on the product of the cross section and branching fraction for an example T mass of 1.2 TeV as a function of the resonance mass for two different decay scenarios. Observed and expected limits are compared to the prediction of two different theory benchmark models, the $G^*$ model (left) and the $\rho ^0$ model (right). |
png pdf |
Figure 9:
Exclusion limits at 95% CL on the product of the cross section and branching fraction for an example mass configuration of $ {M_{{{\mathrm {Z}} ^{\prime}}}} = $ 1.5 TeV and $ {M_{{\text {T}}}} = $ 1.2 TeV as a function of the branching fractions, $\mathcal {B}({{\text {T}} \to {\mathrm {H}} {\mathrm {t}}})$ and $\mathcal {B}({{\text {T}} \to {\mathrm {Z}} {\mathrm {t}}})$. |
| Summary |
| A search for a heavy spin-1 resonance Z' decaying to a SM top quark and a vector-like quark T was presented. |
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Compact Muon Solenoid LHC, CERN |
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