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| CMS-PAS-SUS-16-030 | ||
| Search for supersymmetry in the all-hadronic final state using top quark tagging in pp collisions at $ \sqrt{s} = $ 13 TeV | ||
| CMS Collaboration | ||
| August 2016 | ||
| Abstract: A search for supersymmetry in all-hadronic events with missing transverse momentum using top quark tagging is presented. The data were collected during 2016 in proton-proton collisions at a center-of-mass energy of 13 TeV with the CMS detector at the LHC and correspond to an integrated luminosity of 12.9 fb$^{-1}$. Search regions are defined using the properties of reconstructed jets, the presence of bottom and top quark candidates, and missing transverse momentum. No statistically significant excess of events above the expected contribution from standard model processes is observed. Exclusion limits are set on the masses of potential new particles in the context of simplified models of direct and gluino-mediated top squark production. | ||
| Links: CDS record (PDF) ; inSPIRE record ; CADI line (restricted) ; | ||
| Figures | |
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Figure 1:
The diagram representing the simplified model of direct top squark pair production considered in this study: the T2tt model with top squark decay via a top quark. |
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Figure 2-a:
Diagrams representing the simplified models of gluino-mediated top squark production considered in this study: the T1tttt model (left) where the gluino decays to top quarks and the LSP, and the T5ttcc model (right) where the gluino decays to an on-shell top squark, which decays to a charm quark and the LSP. |
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Figure 2-b:
Diagrams representing the simplified models of gluino-mediated top squark production considered in this study: the T1tttt model (left) where the gluino decays to top quarks and the LSP, and the T5ttcc model (right) where the gluino decays to an on-shell top squark, which decays to a charm quark and the LSP. |
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Figure 3-a:
Comparison of the simulated distributions for ${N_{ {\mathrm {t}}}} $, ${N_{ {\mathrm {b}}}} $, ${M_{\mathrm {T2}}}$ and ${E_{\mathrm {T}}}$ between SM backgrounds (filled histograms) and several example signal models (dashed lines), after the pre-selection requirements have been applied. The T2tt signal model with $m_{ {\tilde{t}} } =$ 850 GeV and $m_{ {\tilde{\chi}^{0}_{1}} } =$ 100 GeV is shown with a red solid line, the T2tt signal model with $m_{ {\tilde{t}} } = $ 500 GeV and $m_{ {\tilde{\chi}^{0}_{1}} } =$ 325 GeV with a blue dashed line, the T1tttt signal model with $m_{ \tilde{\mathrm{g}}} = $ 1200 GeV and $m_{ {\tilde{\chi}^{0}_{1}} } = $ 800 GeV with a green dotted line, and the T1tttt signal model with $m_{ \tilde{\mathrm{g}}} = $ 1500 GeV and $m_{ {\tilde{\chi}^{0}_{1}} } = $ 100 GeV with a black dashed-dotted line. The distributions for the signal models have been normalized to the same area as the total background distribution. The black points show the observed data events for each bin. The numbers associated with each MC background and data are the yield of each sample. The numbers associated with the signal points are the scale. The lower panels show the ratio between data and simulation. |
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Figure 3-b:
Comparison of the simulated distributions for ${N_{ {\mathrm {t}}}} $, ${N_{ {\mathrm {b}}}} $, ${M_{\mathrm {T2}}}$ and ${E_{\mathrm {T}}}$ between SM backgrounds (filled histograms) and several example signal models (dashed lines), after the pre-selection requirements have been applied. The T2tt signal model with $m_{ {\tilde{t}} } =$ 850 GeV and $m_{ {\tilde{\chi}^{0}_{1}} } =$ 100 GeV is shown with a red solid line, the T2tt signal model with $m_{ {\tilde{t}} } = $ 500 GeV and $m_{ {\tilde{\chi}^{0}_{1}} } =$ 325 GeV with a blue dashed line, the T1tttt signal model with $m_{ \tilde{\mathrm{g}}} = $ 1200 GeV and $m_{ {\tilde{\chi}^{0}_{1}} } = $ 800 GeV with a green dotted line, and the T1tttt signal model with $m_{ \tilde{\mathrm{g}}} = $ 1500 GeV and $m_{ {\tilde{\chi}^{0}_{1}} } = $ 100 GeV with a black dashed-dotted line. The distributions for the signal models have been normalized to the same area as the total background distribution. The black points show the observed data events for each bin. The numbers associated with each MC background and data are the yield of each sample. The numbers associated with the signal points are the scale. The lower panels show the ratio between data and simulation. |
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Figure 3-c:
Comparison of the simulated distributions for ${N_{ {\mathrm {t}}}} $, ${N_{ {\mathrm {b}}}} $, ${M_{\mathrm {T2}}}$ and ${E_{\mathrm {T}}}$ between SM backgrounds (filled histograms) and several example signal models (dashed lines), after the pre-selection requirements have been applied. The T2tt signal model with $m_{ {\tilde{t}} } =$ 850 GeV and $m_{ {\tilde{\chi}^{0}_{1}} } =$ 100 GeV is shown with a red solid line, the T2tt signal model with $m_{ {\tilde{t}} } = $ 500 GeV and $m_{ {\tilde{\chi}^{0}_{1}} } =$ 325 GeV with a blue dashed line, the T1tttt signal model with $m_{ \tilde{\mathrm{g}}} = $ 1200 GeV and $m_{ {\tilde{\chi}^{0}_{1}} } = $ 800 GeV with a green dotted line, and the T1tttt signal model with $m_{ \tilde{\mathrm{g}}} = $ 1500 GeV and $m_{ {\tilde{\chi}^{0}_{1}} } = $ 100 GeV with a black dashed-dotted line. The distributions for the signal models have been normalized to the same area as the total background distribution. The black points show the observed data events for each bin. The numbers associated with each MC background and data are the yield of each sample. The numbers associated with the signal points are the scale. The lower panels show the ratio between data and simulation. |
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Figure 3-d:
Comparison of the simulated distributions for ${N_{ {\mathrm {t}}}} $, ${N_{ {\mathrm {b}}}} $, ${M_{\mathrm {T2}}}$ and ${E_{\mathrm {T}}}$ between SM backgrounds (filled histograms) and several example signal models (dashed lines), after the pre-selection requirements have been applied. The T2tt signal model with $m_{ {\tilde{t}} } =$ 850 GeV and $m_{ {\tilde{\chi}^{0}_{1}} } =$ 100 GeV is shown with a red solid line, the T2tt signal model with $m_{ {\tilde{t}} } = $ 500 GeV and $m_{ {\tilde{\chi}^{0}_{1}} } =$ 325 GeV with a blue dashed line, the T1tttt signal model with $m_{ \tilde{\mathrm{g}}} = $ 1200 GeV and $m_{ {\tilde{\chi}^{0}_{1}} } = $ 800 GeV with a green dotted line, and the T1tttt signal model with $m_{ \tilde{\mathrm{g}}} = $ 1500 GeV and $m_{ {\tilde{\chi}^{0}_{1}} } = $ 100 GeV with a black dashed-dotted line. The distributions for the signal models have been normalized to the same area as the total background distribution. The black points show the observed data events for each bin. The numbers associated with each MC background and data are the yield of each sample. The numbers associated with the signal points are the scale. The lower panels show the ratio between data and simulation. |
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Figure 4-a:
Search bin definitions and bin numbers after pre-selection cuts defined in the text. |
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Figure 4-b:
Search bin definitions and bin numbers after pre-selection cuts defined in the text. |
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Figure 4-c:
Search bin definitions and bin numbers after pre-selection cuts defined in the text. |
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Figure 4-d:
Search bin definitions and bin numbers after pre-selection cuts defined in the text. |
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Figure 4-e:
Search bin definitions and bin numbers after pre-selection cuts defined in the text. |
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Figure 4-f:
Search bin definitions and bin numbers after pre-selection cuts defined in the text. |
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Figure 4-g:
Search bin definitions and bin numbers after pre-selection cuts defined in the text. |
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Figure 4-h:
Search bin definitions and bin numbers after pre-selection cuts defined in the text. |
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Figure 4-i:
Search bin definitions and bin numbers after pre-selection cuts defined in the text. |
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Figure 5-a:
(a) The lost-lepton background in the 59 search regions of the analysis as determined directly from ${{\rm t\bar{t}}} $, single top quark, and W+jets simulation (points) and as predicted by applying the lost-lepton background determination procedure to the simulated muon control sample (histograms). The lower panel shows the same results following division by the predicted value. Only statistical uncertainties are shown. (b) The corresponding simulated results for the background from hadronically-decaying $\tau $ leptons. For both plots, vertical lines indicate search regions with different ${N_{ {\mathrm {t}}}} $, ${N_{ {\mathrm {b}}}} $, and ${M_{\mathrm {T2}}}$ values. Within each ($ {N_{ {\mathrm {t}}}} $, ${N_{ {\mathrm {b}}}} $, ${M_{\mathrm {T2}}} $) region, the bins indicate the different ${E_{\mathrm {T}}}$ selections, as defined in Fig. 4. |
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Figure 5-b:
(a) The lost-lepton background in the 59 search regions of the analysis as determined directly from ${{\rm t\bar{t}}} $, single top quark, and W+jets simulation (points) and as predicted by applying the lost-lepton background determination procedure to the simulated muon control sample (histograms). The lower panel shows the same results following division by the predicted value. Only statistical uncertainties are shown. (b) The corresponding simulated results for the background from hadronically-decaying $\tau $ leptons. For both plots, vertical lines indicate search regions with different ${N_{ {\mathrm {t}}}} $, ${N_{ {\mathrm {b}}}} $, and ${M_{\mathrm {T2}}}$ values. Within each ($ {N_{ {\mathrm {t}}}} $, ${N_{ {\mathrm {b}}}} $, ${M_{\mathrm {T2}}} $) region, the bins indicate the different ${E_{\mathrm {T}}}$ selections, as defined in Fig. 4. |
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Figure 6-a:
${N_{ {\mathrm {b}}}}$ (a) and ${E_{\mathrm {T}}}$ (b) distribution in data and simulation in the loose dimuon control region after applying the $S_{DY}(N_\textrm {j})$ scale factor to the simulation. The lower panels show the ratio between data and simulation. Only statistical uncertainties are shown. The values in parentheses in the legend indicate the integrated yield for each given process. |
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Figure 6-b:
${N_{ {\mathrm {b}}}}$ (a) and ${E_{\mathrm {T}}}$ (b) distribution in data and simulation in the loose dimuon control region after applying the $S_{DY}(N_\textrm {j})$ scale factor to the simulation. The lower panels show the ratio between data and simulation. Only statistical uncertainties are shown. The values in parentheses in the legend indicate the integrated yield for each given process. |
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Figure 7:
The QCD multijet background in the 59 search regions of the analysis as determined directly from QCD multijet simulation (points) and as predicted by applying the QCD multijet background determination procedure to simulated event samples in the inverted-$\Delta \phi $ control region (histograms). The lower panel shows the same results following division by the predicted value. Only statistical uncertainties are shown. The labeling of the search regions is the same as in Fig. 5. |
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Figure 8:
Observed event yields in data (black points) and predicted SM background (filled solid area) for the 59 search bins. The lower panel shows the ratio of data over total background prediction in each search bin. Only statistical uncertainties of observed data are propagated to the ratio. The shaded bands indicate uncertainties of total predictions with dark grey for systematic uncertainty and light grey for statistical uncertainty. |
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Figure 9:
Exclusion limits at 95% CL for simplified models of top squark pair production in the T2tt scenario. The solid black curves represent the observed exclusion contours with respect to NLO+NLL cross section calculations [54] and the corresponding $\pm$1 standard deviations. The dashed red curves indicate the expected exclusion contour and the $\pm$1 standard deviations with experimental uncertainties. |
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Figure 10:
Exclusion limits at 95% CL for simplified models of top squarks produced through decays of gluino pairs in the T1tttt scenario. The solid black curves represent the observed exclusion contours with respect to NLO+NLL cross section calculations [54] and the corresponding $\pm$1 standard deviations. The dashed red curves indicate the expected exclusion contour and the $\pm$1 standard deviations with experimental uncertainties. |
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Figure 11:
Exclusion limits at 95% CL for simplified models of top squarks produced through decays of gluino pairs in the T5ttcc scenario. The solid black curves represent the observed exclusion contours with respect to NLO+NLL cross section calculations [54] and the corresponding $\pm$1 standard deviations. The dashed red curves indicate the expected exclusion contour and the $\pm$1 standard deviations with experimental uncertainties. |
| Tables | |
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Table 1:
Observed yields from the data compared to the total background predictions for the search bins. Uncertainties are listed as $\pm $ statistical $\pm $ systematic. |
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Table 2:
Continued table: observed yields from the data compared to the total background predictions for the search bins. Uncertainties are listed as $\pm $ statistical $\pm $ systematic. |
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Table 3:
Observed number of events and background predictions in the aggregate search regions as defined in the text. A plus-sign is used as shorthand for the listed value or more. Uncertainties are listed as $\pm $ statistical $\pm $ systematic. |
| Summary |
| The results of a search for direct and gluino-mediated top squark production in final states including top-like objects have been presented. The search uses all-hadronic events with at least four jets and large $E_{\mathrm{T}}^{\text{miss}}$, selected from a data sample corresponding to an integrated luminosity of 12.9 fb$^{-1}$ collected in proton-proton collisions at a center-of-mass energy of 13 TeV with the CMS detector during 2016. A set of search regions is defined based on $E_{\mathrm{T}}^{\text{miss}}$, ${M_{\mathrm{T}}}$, the number of top-like objects, and the number of b-tagged jets. No statistically significant excess of events above the expected standard model background is observed, and exclusion limits are set at the 95% confidence level for simplified models of direct top squark pair production and gluino pair production where the gluinos decay to final states including top quarks. For simplified models of pair production of top squarks, which decay to a top quark and a neutralino, top squark masses up to 910 GeV and neutralino masses up to 400 GeV are excluded at 95% CL. For models with gluino pair production, gluino masses up to 1700 (1780) GeV and neutralino masses up to 1060 (1020) GeV are excluded for the T5ttcc (T1tttt) models. |
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