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| CMS-SUS-16-032 ; CERN-EP-2017-144 | ||
| Search for the pair production of third-generation squarks with two-body decays to a bottom or charm quark and a neutralino in proton-proton collisions at $ \sqrt{s} = $ 13 TeV | ||
| CMS Collaboration | ||
| 23 July 2017 | ||
| Phys. Lett. B 778 (2018) 263 | ||
| Abstract: Results are presented from a search for the pair production of third-generation squarks in proton-proton collision events with two-body decays to bottom or charm quarks and a neutralino, which produces a significant imbalance in the transverse momentum. The search is performed using a sample of proton-proton collision data at $ \sqrt{s} = $ 13 TeV recorded by the CMS experiment at the LHC, corresponding to an integrated luminosity of 35.9 fb$^{-1}$. No statistically significant excess of events is observed beyond the expected contribution from standard model processes. Exclusion limits are set in the context of simplified models of bottom or top squark pair production. Models with bottom squark masses up to 1220 GeV are excluded at 95% confidence level for light neutralinos, and models with top squark masses of 510 GeV are excluded assuming that the mass splitting between the top squark and the neutralino is small. | ||
| Links: e-print arXiv:1707.07274 [hep-ex] (PDF) ; CDS record ; inSPIRE record ; CADI line (restricted) ; | ||
| Figures & Tables | Summary | Additional Figures & Tables | References | CMS Publications |
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Additional information on efficiencies needed for reinterpretation of these results are available here.
Additional technical material for CMS speakers can be found here. |
| Figures | |
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Figure 1:
Diagrams showing the pair production of bottom or top squarks followed by their decays according to $\tilde{ \mathrm{ b } } \rightarrow \mathrm{ b } \tilde{ \chi }^0 _1$ (left ) and $\tilde{ \mathrm{ t } } \rightarrow \mathrm{c} \tilde{ \chi }^0 _1$ (right ). |
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Figure 1-a:
Diagram showing the pair production of bottom squarks followed by their decays according to $\tilde{ \mathrm{ b } } \rightarrow \mathrm{ b } \tilde{ \chi }^0 _1$. |
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Figure 1-b:
Diagrams showing the pair production of top squarks followed by their decays according to $\tilde{ \mathrm{ t } } \rightarrow \mathrm{c} \tilde{ \chi }^0 _1$. |
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Figure 2:
Distribution of ${M_{\mathrm {CT}}}$ (left ) and $ {p_{\mathrm {T}}} (\text {j}_{1})+ {p_{\mathrm {T}}} (\text {j}_{2})$ (right ) for the searches in noncompressed regions from simulation. The stacked, filled histograms represent different background components while the lines show two signal models with different bottom squark and neutralino mass hypotheses, ($m_{\tilde{ \mathrm{ b } } } = $ 900 GeV and $m_{\tilde{ \chi }^0 _1} = $ 300 GeV) and ($m_{\tilde{ \mathrm{ b } } } = $ 1200 GeV and $m_{\tilde{ \chi }^0 _1} = $ 100 GeV). |
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Figure 2-a:
Distribution of ${M_{\mathrm {CT}}}$ for the searches in noncompressed regions from simulation. The stacked, filled histograms represent different background components while the lines show two signal models with different bottom squark and neutralino mass hypotheses, ($m_{\tilde{ \mathrm{ b } } } = $ 900 GeV and $m_{\tilde{ \chi }^0 _1} = $ 300 GeV) and ($m_{\tilde{ \mathrm{ b } } } = $ 1200 GeV and $m_{\tilde{ \chi }^0 _1} = $ 100 GeV). |
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Figure 2-b:
Distribution of $ {p_{\mathrm {T}}} (\text {j}_{1})+ {p_{\mathrm {T}}} (\text {j}_{2})$ for the searches in noncompressed regions from simulation. The stacked, filled histograms represent different background components while the lines show two signal models with different bottom squark and neutralino mass hypotheses, ($m_{\tilde{ \mathrm{ b } } } = $ 900 GeV and $m_{\tilde{ \chi }^0 _1} = $ 300 GeV) and ($m_{\tilde{ \mathrm{ b } } } = $ 1200 GeV and $m_{\tilde{ \chi }^0 _1} = $ 100 GeV). |
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Figure 3:
Distributions of the combined b-, c-tagged jet, and SV multiplicity (left ), and ${p_{\mathrm {T}}^{\mathrm {miss}}}$ for events with at least one b- or c-tagged jet (right ), after the baseline selection for the compressed mass spectrum analysis, as obtained from simulation. The stacked, filled histograms represent different background components while the lines show two signal models with different bottom and top squark and neutralino mass hypotheses, ($m_{\tilde{ \mathrm{ b } } } = $ 550 GeV and $m_{\tilde{ \chi }^0 _1} = $ 500 GeV) and ($m_{\tilde{ \mathrm{ t } } } = $ 400 GeV and $m_{\tilde{ \chi }^0 _1} = $ 370 GeV). |
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Figure 3-a:
Distribution of the combined b-, c-tagged jet, and SV multiplicity, after the baseline selection for the compressed mass spectrum analysis, as obtained from simulation. The stacked, filled histograms represent different background components while the lines show two signal models with different bottom and top squark and neutralino mass hypotheses, ($m_{\tilde{ \mathrm{ b } } } = $ 550 GeV and $m_{\tilde{ \chi }^0 _1} = $ 500 GeV) and ($m_{\tilde{ \mathrm{ t } } } = $ 400 GeV and $m_{\tilde{ \chi }^0 _1} = $ 370 GeV). |
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Figure 3-b:
Distribution of ${p_{\mathrm {T}}^{\mathrm {miss}}}$ for events with at least one b- or c-tagged jet, after the baseline selection for the compressed mass spectrum analysis, as obtained from simulation. The stacked, filled histograms represent different background components while the lines show two signal models with different bottom and top squark and neutralino mass hypotheses, ($m_{\tilde{ \mathrm{ b } } } = $ 550 GeV and $m_{\tilde{ \chi }^0 _1} = $ 500 GeV) and ($m_{\tilde{ \mathrm{ t } } } = $ 400 GeV and $m_{\tilde{ \chi }^0 _1} = $ 370 GeV). |
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Figure 4:
Yields in the signal regions targeting the noncompressed (top left) and compressed (top right: $ {N_{\text {b-tags}}} = $ 1, 2, bottom left: $ {N_{\text {c-tags}}} = $ 1, 2, bottom right: $ {N_{\text {b-tags}}} + {N_{\text {c-tags}}} = $ 0) scenarios. Data are shown as black points. The background predictions are represented by the stacked, filled histograms. The expected yields for several signal models are also shown. The lower panels show the ratio of data over total background prediction in each signal region. The hatching indicates the total uncertainty in the background predictions. |
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Figure 4-a:
Yields in the signal regions targeting the noncompressed scenario. Data are shown as black points. The background predictions are represented by the stacked, filled histograms. The expected yields for several signal models are also shown. The lower panel shows the ratio of data over total background prediction in each signal region. The hatching indicates the total uncertainty in the background predictions. |
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Figure 4-b:
Yields in the signal regions targeting the compressed $ {N_{\text {b-tags}}} = $ 1, 2 scenario. Data are shown as black points. The background predictions are represented by the stacked, filled histograms. The expected yields for several signal models are also shown. The lower panel shows the ratio of data over total background prediction in each signal region. The hatching indicates the total uncertainty in the background predictions. |
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Figure 4-c:
Yields in the signal regions targeting the compressed $ {N_{\text {c-tags}}} = $ 1, 2 scenario. Data are shown as black points. The background predictions are represented by the stacked, filled histograms. The expected yields for several signal models are also shown. The lower panel shows the ratio of data over total background prediction in each signal region. The hatching indicates the total uncertainty in the background predictions. |
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Figure 4-d:
Yields in the signal regions targeting the compressed $ {N_{\text {b-tags}}} + {N_{\text {c-tags}}} = $ 0 scenario. Data are shown as black points. The background predictions are represented by the stacked, filled histograms. The expected yields for several signal models are also shown. The lower panel shows the ratio of data over total background prediction in each signal region. The hatching indicates the total uncertainty in the background predictions. |
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Figure 5:
Exclusion limits at 95% CL for direct bottom squark pair production for the decay mode $ {\tilde{ \mathrm{ b } } _{1}} \to \mathrm{ b } \tilde{\chi}^0_1 $. The regions enclosed by the black curves represent the observed exclusion and the ${\pm }1$ standard deviation for the NLO+NLL cross section calculations and their uncertaintes [68]. The dashed red lines indicate the expected limits at 95% CL and their ${\pm }1$ standard deviation experimental uncertainties. |
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Figure 6:
The combined 95% CL exclusion limits for top squark pair production assuming 100% branching fraction to the decay $\tilde{ \mathrm{ t } } \rightarrow \mathrm{c} \tilde{ \chi }^0 _1$. Notations are as in Fig 5. |
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Figure A1:
The correlation matrix for the estimated backgrounds in the noncompressed search region. The bin numbers are defined in Table 5. |
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Figure A2:
The correlation matrix for the estimated backgrounds in the compressed search region. The bin numbers are defined in Table A1. |
| Tables | |
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Table 1:
A summary of the baseline selections used for the noncompressed and compressed search regions. |
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Table 2:
The categorization of ${H_{\mathrm {T}}}$ and ${M_{\mathrm {CT}}}$ for search regions in noncompressed signal models. |
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Table 3:
The categorization in ${N_{\text {b-tags}}} $, ${N_{\text {c-tags}}} $, ${N_{\text {SV}}} $, ${H_{\mathrm {T}}} $, and ${p_{\mathrm {T}}^{\mathrm {miss}}}$ for search regions in models with compressed spectra. |
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Table 4:
Different systematic uncertainties in the lost-lepton background estimate. |
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Table 5:
Observed number of events and background prediction in the noncompressed regions. The total uncertainties in the background predictions are shown. |
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Table 6:
Observed number of events and the background prediction in the compressed regions with $ {N_{\text {b-tags}}} = $ 1, 2. The total uncertainties in the background predictions are also shown. |
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Table 7:
Observed number of events and the background prediction in the compressed regions with $ {N_{\text {c-tags}}} = $ 1, 2. The total uncertainties in the background predictions are also shown. |
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Table 8:
Observed number of events and the background prediction in the compressed regions with $ {N_{\text {b-tags}}} + {N_{\text {c-tags}}} = $ 0. The total uncertainties in the background predictions are also shown. |
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Table A1:
The bin number and definition for the compressed search region as shown in Fig. A1. |
| Summary |
| A search for the pair production of third-generation squarks is performed using data collected by the CMS experiment, focusing on two-body decays to bottom or charm quarks. For bottom-squark pair production, the decay mode considered is ${\tilde{ \mathrm{ b } }_{1}} \rightarrow\mathrm{ b }\tilde{\chi}^0_1$, while for top-squark pair production, the decay mode considered is ${\tilde{ \mathrm{ t } }_{1}} \rightarrow\mathrm{c}\tilde{\chi}^0_1$, a flavor-changing neutral current process. No statistically significant excess of events is observed above the expected standard model background, and exclusion limits are set at 95% confidence level in the context of simplified models of direct top and bottom squark pair production. Bottom squark masses below 1220 GeV are excluded assuming that the lightest supersymmetric particle (LSP) is massless; bottom squark masses below 625 GeV are excluded for LSP masses up to 600 GeV. Top squark masses below 510 GeV are excluded for the scenario in which ${\tilde{ \mathrm{ t } }_{1}} \rightarrow\mathrm{c}\tilde{\chi}^0_1$ and the mass splitting between the top squark and the LSP is small. |
| Additional Figures | |
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Additional Figure 1:
Observed significances for simplified models of bottom squark pair production in the $\tilde{ \mathrm{ b } } \rightarrow \mathrm{ b } \tilde{ \chi }^0 _1$ decay scenario. |
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Additional Figure 2:
Observed significances for simplified models of top squark pair production in the $\tilde{ \mathrm{ t } } \rightarrow \mathrm{c} \tilde{ \chi }^0 _1$ decay scenario. |
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Additional Figure 3:
The covariance matrix for the estimated backgrounds in the noncompressed search region. |
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Additional Figure 4:
The covariance matrix for the estimated backgrounds in the compressed search region. |
| Additional Tables | |
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Additional Table 1:
Event yields from simulation for two signal points ($m_{\tilde{ \mathrm{ b } } } = $ 900 GeV and $m_{\tilde{ \chi }^0 _1} = $ 300 GeV) and ($m_{\tilde{ \mathrm{ b } } } = $ 1200 GeV and $m_{\tilde{ \chi }^0 _1} = $ 100 GeV) after applying each requirement in the non-compressed search region. The numbers are normalized to an integrated luminosity of 35.9 fb$^{-1}$ and the uncertainties correspond to statistical uncertainty from the MC samples. |
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Additional Table 2:
Event yields from simulation for two signal points ($m_{\tilde{ \mathrm{ b } } } = $ 550 GeV and $m_{\tilde{ \chi }^0 _1} = $ 500 GeV) and ($m_{\tilde{ \mathrm{ t } } } = $ 400 GeV and $m_{\tilde{ \chi }^0 _1} = $ 370 GeV) after applying each requirement in the compressed search region. The numbers are normalized to an integrated luminosity of 35.9 fb$^{-1}$ and the uncertainties correspond to statistical uncertainty from the MC samples. |
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