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| CMS-PAS-TOP-17-020 | ||
| Search for new physics via top quark production in dilepton final state at 13 TeV | ||
| CMS Collaboration | ||
| September 2018 | ||
| Abstract: A search for new physics in top quark production is performed in proton-proton collisions at 13 TeV. The data-set corresponds to an integrated luminosity of 35.9 fb$^{-1}$, and was collected in 2016 by the CMS detector. Events with two isolated leptons (electrons or muons) and b quark jets in the final state are selected. The search is sensitive to new physics in top quark pair production and in single top quark production in association with a W boson. This is the first search for new physics that uses the tW process. No significant deviation from the standard model expectation is observed. Results are interpreted in the framework of an effective field theory and constraints on the relevant effective couplings are set using a dedicated multivariate analysis. | ||
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Links:
CDS record (PDF) ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, EPJC 79 (2019) 886. The superseded preliminary plots can be found here. |
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| Figures | |
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Figure 1:
Representative Feynman diagrams for the tW (left panel) and ${{\mathrm {t}\overline {\mathrm {t}}}}$ (right panel) production at leading order. The upper row gives the SM diagrams, the middle and lower rows present diagrams corresponding to the $O_{\phi q}^{(3)}$, $O_{tW}$,$O_{tG}$, $O_{G}$ and $O_{u/cG}$ contributions. |
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Figure 2:
The observed numbers of events and SM background predictions in the search regions of the analysis for the ee (upper left), $\mu \mu $ (upper right) and e$\mu $ (lower) channel. The hatched band corresponds to the quadratic sum of statistical and systematic uncertainties in the event yield for the SM background predictions. The ratios of data to the sum of the predicted yields are shown at the bottom of each plot. The narrow hatched band represents the contribution from the statistical uncertainty in the MC simulation. |
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Figure 2-a:
The observed numbers of events and SM background predictions in the search regions of the analysis for the ee (upper left), $\mu \mu $ (upper right) and e$\mu $ (lower) channel. The hatched band corresponds to the quadratic sum of statistical and systematic uncertainties in the event yield for the SM background predictions. The ratios of data to the sum of the predicted yields are shown at the bottom of each plot. The narrow hatched band represents the contribution from the statistical uncertainty in the MC simulation. |
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Figure 2-b:
The observed numbers of events and SM background predictions in the search regions of the analysis for the ee (upper left), $\mu \mu $ (upper right) and e$\mu $ (lower) channel. The hatched band corresponds to the quadratic sum of statistical and systematic uncertainties in the event yield for the SM background predictions. The ratios of data to the sum of the predicted yields are shown at the bottom of each plot. The narrow hatched band represents the contribution from the statistical uncertainty in the MC simulation. |
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Figure 2-c:
The observed numbers of events and SM background predictions in the search regions of the analysis for the ee (upper left), $\mu \mu $ (upper right) and e$\mu $ (lower) channel. The hatched band corresponds to the quadratic sum of statistical and systematic uncertainties in the event yield for the SM background predictions. The ratios of data to the sum of the predicted yields are shown at the bottom of each plot. The narrow hatched band represents the contribution from the statistical uncertainty in the MC simulation. |
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Figure 3:
Observed (solid) and expected (dashed) likelihood scans of the effective couplings: C$_{G}$ (upper left) and C$_{tG}$ (upper right), C$_{tW}$ (middle left), C$_{\phi q}$ (middle right), and C$_{uG}$ (lower left) and C$_{cG}$ (lower right). The thick curves indicate the nominal fit and the other curves represent fits to the observed data with the variations of normalization due to the theoretical uncertainties. |
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Figure 3-a:
Observed (solid) and expected (dashed) likelihood scans of the effective couplings: C$_{G}$ (upper left) and C$_{tG}$ (upper right), C$_{tW}$ (middle left), C$_{\phi q}$ (middle right), and C$_{uG}$ (lower left) and C$_{cG}$ (lower right). The thick curves indicate the nominal fit and the other curves represent fits to the observed data with the variations of normalization due to the theoretical uncertainties. |
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Figure 3-b:
Observed (solid) and expected (dashed) likelihood scans of the effective couplings: C$_{G}$ (upper left) and C$_{tG}$ (upper right), C$_{tW}$ (middle left), C$_{\phi q}$ (middle right), and C$_{uG}$ (lower left) and C$_{cG}$ (lower right). The thick curves indicate the nominal fit and the other curves represent fits to the observed data with the variations of normalization due to the theoretical uncertainties. |
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Figure 3-c:
Observed (solid) and expected (dashed) likelihood scans of the effective couplings: C$_{G}$ (upper left) and C$_{tG}$ (upper right), C$_{tW}$ (middle left), C$_{\phi q}$ (middle right), and C$_{uG}$ (lower left) and C$_{cG}$ (lower right). The thick curves indicate the nominal fit and the other curves represent fits to the observed data with the variations of normalization due to the theoretical uncertainties. |
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Figure 3-d:
Observed (solid) and expected (dashed) likelihood scans of the effective couplings: C$_{G}$ (upper left) and C$_{tG}$ (upper right), C$_{tW}$ (middle left), C$_{\phi q}$ (middle right), and C$_{uG}$ (lower left) and C$_{cG}$ (lower right). The thick curves indicate the nominal fit and the other curves represent fits to the observed data with the variations of normalization due to the theoretical uncertainties. |
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Figure 3-e:
Observed (solid) and expected (dashed) likelihood scans of the effective couplings: C$_{G}$ (upper left) and C$_{tG}$ (upper right), C$_{tW}$ (middle left), C$_{\phi q}$ (middle right), and C$_{uG}$ (lower left) and C$_{cG}$ (lower right). The thick curves indicate the nominal fit and the other curves represent fits to the observed data with the variations of normalization due to the theoretical uncertainties. |
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Figure 3-f:
Observed (solid) and expected (dashed) likelihood scans of the effective couplings: C$_{G}$ (upper left) and C$_{tG}$ (upper right), C$_{tW}$ (middle left), C$_{\phi q}$ (middle right), and C$_{uG}$ (lower left) and C$_{cG}$ (lower right). The thick curves indicate the nominal fit and the other curves represent fits to the observed data with the variations of normalization due to the theoretical uncertainties. |
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Figure 4:
The NN output distributions for data and MC in different categories: (1-jet,1-tag) (upper row), (2-jets,1-tag) (lower row) used in the limit setting for the ee (left column) and $\mu \mu $ (right column) channels. The hatched band corresponds to the sum of the statistical and systematic uncertainties in the event yield for the sum of signal and background predictions. The ratios of data to the sum of the predicted yields are shown at the bottom of each plot. The narrow hatched band represents the contribution from the statistical uncertainty in the MC simulation. |
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Figure 4-a:
The NN output distributions for data and MC in different categories: (1-jet,1-tag) (upper row), (2-jets,1-tag) (lower row) used in the limit setting for the ee (left column) and $\mu \mu $ (right column) channels. The hatched band corresponds to the sum of the statistical and systematic uncertainties in the event yield for the sum of signal and background predictions. The ratios of data to the sum of the predicted yields are shown at the bottom of each plot. The narrow hatched band represents the contribution from the statistical uncertainty in the MC simulation. |
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Figure 4-b:
The NN output distributions for data and MC in different categories: (1-jet,1-tag) (upper row), (2-jets,1-tag) (lower row) used in the limit setting for the ee (left column) and $\mu \mu $ (right column) channels. The hatched band corresponds to the sum of the statistical and systematic uncertainties in the event yield for the sum of signal and background predictions. The ratios of data to the sum of the predicted yields are shown at the bottom of each plot. The narrow hatched band represents the contribution from the statistical uncertainty in the MC simulation. |
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Figure 4-c:
The NN output distributions for data and MC in different categories: (1-jet,1-tag) (upper row), (2-jets,1-tag) (lower row) used in the limit setting for the ee (left column) and $\mu \mu $ (right column) channels. The hatched band corresponds to the sum of the statistical and systematic uncertainties in the event yield for the sum of signal and background predictions. The ratios of data to the sum of the predicted yields are shown at the bottom of each plot. The narrow hatched band represents the contribution from the statistical uncertainty in the MC simulation. |
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Figure 4-d:
The NN output distributions for data and MC in different categories: (1-jet,1-tag) (upper row), (2-jets,1-tag) (lower row) used in the limit setting for the ee (left column) and $\mu \mu $ (right column) channels. The hatched band corresponds to the sum of the statistical and systematic uncertainties in the event yield for the sum of signal and background predictions. The ratios of data to the sum of the predicted yields are shown at the bottom of each plot. The narrow hatched band represents the contribution from the statistical uncertainty in the MC simulation. |
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Figure 5:
The NN output distributions for data and MC in different categories: (1-jet,1-tag) (upper row left), (2-jets,1-tag) (upper row right) and (1-jet,0-tag) (lower row) used in the limit setting for the e$\mu $ channel. The hatched band corresponds to the sum of the statistical and systematic uncertainties in the event yield for the sum of signal and background predictions. The ratios of data to the sum of the predicted yields are shown at the bottom of each plot. The narrow hatched band represents the contribution from the statistical uncertainty in the MC simulation. |
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Figure 5-a:
The NN output distributions for data and MC in different categories: (1-jet,1-tag) (upper row left), (2-jets,1-tag) (upper row right) and (1-jet,0-tag) (lower row) used in the limit setting for the e$\mu $ channel. The hatched band corresponds to the sum of the statistical and systematic uncertainties in the event yield for the sum of signal and background predictions. The ratios of data to the sum of the predicted yields are shown at the bottom of each plot. The narrow hatched band represents the contribution from the statistical uncertainty in the MC simulation. |
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Figure 5-b:
The NN output distributions for data and MC in different categories: (1-jet,1-tag) (upper row left), (2-jets,1-tag) (upper row right) and (1-jet,0-tag) (lower row) used in the limit setting for the e$\mu $ channel. The hatched band corresponds to the sum of the statistical and systematic uncertainties in the event yield for the sum of signal and background predictions. The ratios of data to the sum of the predicted yields are shown at the bottom of each plot. The narrow hatched band represents the contribution from the statistical uncertainty in the MC simulation. |
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Figure 5-c:
The NN output distributions for data and MC in different categories: (1-jet,1-tag) (upper row left), (2-jets,1-tag) (upper row right) and (1-jet,0-tag) (lower row) used in the limit setting for the e$\mu $ channel. The hatched band corresponds to the sum of the statistical and systematic uncertainties in the event yield for the sum of signal and background predictions. The ratios of data to the sum of the predicted yields are shown at the bottom of each plot. The narrow hatched band represents the contribution from the statistical uncertainty in the MC simulation. |
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Figure 6:
The NN output distribution for data, MC and FCNC signals in the (njets,1-tag) category used in the limit setting for the ee (upper row left), e$\mu $ (upper row right) and $\mu \mu $ (lower row) channels. The hatched band corresponds to the sum of the statistical and systematic uncertainties in the event yield for the sum of signal and background predictions. The ratios of data to the sum of the predicted yields are shown at the bottom of each plot. The narrow hatched band represents the contribution from the statistical uncertainty in the MC simulation. |
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Figure 6-a:
The NN output distribution for data, MC and FCNC signals in the (njets,1-tag) category used in the limit setting for the ee (upper row left), e$\mu $ (upper row right) and $\mu \mu $ (lower row) channels. The hatched band corresponds to the sum of the statistical and systematic uncertainties in the event yield for the sum of signal and background predictions. The ratios of data to the sum of the predicted yields are shown at the bottom of each plot. The narrow hatched band represents the contribution from the statistical uncertainty in the MC simulation. |
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Figure 6-b:
The NN output distribution for data, MC and FCNC signals in the (njets,1-tag) category used in the limit setting for the ee (upper row left), e$\mu $ (upper row right) and $\mu \mu $ (lower row) channels. The hatched band corresponds to the sum of the statistical and systematic uncertainties in the event yield for the sum of signal and background predictions. The ratios of data to the sum of the predicted yields are shown at the bottom of each plot. The narrow hatched band represents the contribution from the statistical uncertainty in the MC simulation. |
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Figure 6-c:
The NN output distribution for data, MC and FCNC signals in the (njets,1-tag) category used in the limit setting for the ee (upper row left), e$\mu $ (upper row right) and $\mu \mu $ (lower row) channels. The hatched band corresponds to the sum of the statistical and systematic uncertainties in the event yield for the sum of signal and background predictions. The ratios of data to the sum of the predicted yields are shown at the bottom of each plot. The narrow hatched band represents the contribution from the statistical uncertainty in the MC simulation. |
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Figure 7:
Observed best fit together with one and two standard deviation bounds on the top quark effective couplings. The blue dashed line shows the SM expectation and the red verical lines indicate the $95%$ CL bounds including the theoretical uncertainties. |
| Tables | |
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Table 1:
Cross sections for ${{\mathrm {t}\overline {\mathrm {t}}}}$ and tW production [in pb] for the various effective couplings for $\lambda = $ 1 TeV. The respective available K-factors are also shown. |
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Table 2:
Numbers of expected events from tW, ${{\mathrm {t}\overline {\mathrm {t}}}}$ and DY production, from the remaining backgrounds (other and nonprompt backgrounds), total background contribution and observed events in data after all selections for the ee, e$\mu $ and $\mu \mu $ channels and for various (n-jets,m-tags) categories. The uncertainties correspond to the statistical contribution only for the individual background predictions and to the quadratic sum of the statistical and systematic contributions for the total background predictions. |
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Table 3:
Summary of the observables used for probing effective couplings in various (n-jets,m-tags) categories in the ee, e$\mu $, $\mu \mu $ channels. |
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Table 4:
Input variables for the NN used in the analysis in various bins of n-jets and m-tags. The symbols "v" indicate the variables used for the 3 categories and for the FCNC analysis. |
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Table 5:
Summary of the observed and expected allowed intervals at 68% CL (best fit values with up and low limits) and $95%$ CL (in square brackets) on the effective couplings obtained in the ee, e$\mu $, $\mu \mu $ channels and all channels combined. |
| Summary |
| A search for new physics in top quark interactions is performed using dilepton final state events. The single top quark production in association with a W boson is probed for the first time together with the top quark pair production to find the new physics signatures. The analysis is based on 35.9 fb$^{-1}$ of data from proton-proton collisions at 13 TeV collected by the CMS detector in 2016. No significant excess above the standard model background expectation is observed. The results are interpreted to constrain the relevant effective couplings using a dedicated multivariate analysis. The observed 95% CL limit band on effective couplings are found to be $[-1.01,0.70]$ for C$_{G}$, $[-0.41,0.17]$ for C$_{tG}$, $[-0.96,5.74]$ for C$_{tW}$ and $[-3.82,0.63]$ for C$_{\phi q}^{(3)}$. The corresponding expected limits are [$-1.07$,0.76] for C$_{G}$, $[-0.30,0.28]$ for C$_{tG}$, $[-1.91,6.70]$ for C$_{tW}$ and [$-2.04$,1.63] for C$_{\phi q}^{(3)}$. For the FCNC effective couplings, the observed limits are $[-0.22,0.22]$ and $[-0.46,0.46]$ for C$_{uG}$ and C$_{cG}$, respectively; the expected limit being $[-0.30,0.30]$ and $[-0.65,0.65]$. The extracted values give the first experimental bound on the C$_{G}$ coupling and improve upon limits previously obtained at 8 TeV for C$_{tG}$. The limits obtained on the C$_{tW}$, C$_{\phi q}^{(3)}$, C$_{uG}$ and C$_{cG}$ couplings from the tW process are complementary to the limits from the single top t-channel process. |
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Compact Muon Solenoid LHC, CERN |
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