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| CMS-PAS-SUS-16-049 | ||
| Search for direct top squark pair production in the all-hadronic final state in proton-proton collisions at $\sqrt{s} = $ 13 TeV | ||
| CMS Collaboration | ||
| March 2017 | ||
| Abstract: A comprehensive search for direct production of top squark pairs in events with jets and large transverse momentum imbalance is presented. The data were collected in proton-proton collisions at a center-of-mass energy of 13 TeV and correspond to an integrated luminosity of 35.9 fb$^{-1}$. The search targets a variety of signal models of direct top squark production, including models for which the top squark and neutralino masses are nearly degenerate. Dedicated object reconstruction tools are developed to exploit the unique characteristics of the signal topology. No significant excess of events above the standard model expectation is observed. Exclusion limits are set in the context of simplified supersymmetric models of top squark pair production and various decay hypotheses. Top squark and neutralino masses up to 1040 GeV and 610 GeV, respectively, are probed under the model assumptions. | ||
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Links:
CDS record (PDF) ;
inSPIRE record ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, JHEP 10 (2017) 005. The superseded preliminary plots can be found here. |
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| 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 can be found here |
| Figures | |
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Figure 1:
Diagrams representing the pair production of top squarks and their subsequent decay modes that are studied in this document. |
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Figure 1-a:
Diagram representing the pair production of top squarks and their subsequent decay. |
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Figure 1-b:
Diagram representing the pair production of top squarks and their subsequent decay. |
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Figure 1-c:
Diagram representing the pair production of top squarks and their subsequent decay. |
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Figure 1-d:
Diagram representing the pair production of top squarks and their subsequent decay. |
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Figure 1-e:
Diagram representing the pair production of top squarks and their subsequent decay. |
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Figure 1-f:
Diagram representing the pair production of top squarks and their subsequent decay. |
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Figure 2:
Efficiency to correctly identify a merged top (left) or a merged boson (right) as a function of the ${p_{\mathrm {T}}}$ of the generated top quark or boson. |
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Figure 2-a:
Efficiency to correctly identify a merged top as a function of the ${p_{\mathrm {T}}}$ of the generated top quark. |
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Figure 2-b:
Efficiency to correctly identify a merged boson as a function of the ${p_{\mathrm {T}}}$ of the generated boson. |
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Figure 3:
Efficiency to correctly identify a resolved top as a function of the $ {p_{\mathrm {T}}} $ of the generated top quark (left); misidentification rate as a function of the $ {p_{\mathrm {T}}} $ of the resolved top in a QCD multijet dominated sample (right). |
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Figure 3-a:
Efficiency to correctly identify a resolved top as a function of the $ {p_{\mathrm {T}}} $ of the generated top quark. |
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Figure 3-b:
Misidentification rate as a function of the $ {p_{\mathrm {T}}} $ of the resolved top in a QCD multijet dominated sample. |
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Figure 4:
Test of the background prediction strategy in the low-$ {E_{\mathrm {T}}^{\text {miss}}}$ validation sample for the low $ {\Delta m} $ (left) and high $ {\Delta m} $ (right) selections. The ratio of the observed data to the SM prediction derived from control regions is shown in the ratio plots. The shaded blue band represents the statistical uncertainty and systematic uncertainty resulting from the top and tagging correction factors on the background prediction. |
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Figure 4-a:
Test of the background prediction strategy in the low-$ {E_{\mathrm {T}}^{\text {miss}}}$ validation sample for the low $ {\Delta m} $ selection. The ratio of the observed data to the SM prediction derived from control regions is shown in the ratio plot. The shaded blue band represents the statistical uncertainty and systematic uncertainty resulting from the top and tagging correction factors on the background prediction. |
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Figure 4-b:
Test of the background prediction strategy in the low-$ {E_{\mathrm {T}}^{\text {miss}}}$ validation sample for the high $ {\Delta m} $ selection. The ratio of the observed data to the SM prediction derived from control regions is shown in the ratio plot. The shaded blue band represents the statistical uncertainty and systematic uncertainty resulting from the top and tagging correction factors on the background prediction. |
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Figure 5:
Observed data events and SM background predictions for the low $ {\Delta m} $ search regions with $N_{\mathrm{ b } }=$ 0 (top left), $N_{\mathrm{ b } }=$ 1 (top right) and $N_{\mathrm{ b } }\geq $ 2 (bottom). The predictions shown do not include the effects of the maximum likelihood fit to the data. The ratio of observed data to prediction is shown in the lower panel of each plot. The shaded blue band represents the statistical and systematic uncertainty on the prediction. Units are in GeV. |
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Figure 5-a:
Observed data events and SM background predictions for the low $ {\Delta m} $ search regions with $N_{\mathrm{ b } }=$ 0.The predictions shown do not include the effects of the maximum likelihood fit to the data. The ratio of observed data to prediction is shown in the lower panel. The shaded blue band represents the statistical and systematic uncertainty on the prediction. Units are in GeV. |
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Figure 5-b:
Observed data events and SM background predictions for the low $ {\Delta m} $ search regions with $N_{\mathrm{ b } }=$ 1. The predictions shown do not include the effects of the maximum likelihood fit to the data. The ratio of observed data to prediction is shown in the lower panel. The shaded blue band represents the statistical and systematic uncertainty on the prediction. Units are in GeV. |
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Figure 5-c:
Observed data events and SM background predictions for the low $ {\Delta m} $ search regions with $N_{\mathrm{ b } }\geq $ 2. The predictions shown do not include the effects of the maximum likelihood fit to the data. The ratio of observed data to prediction is shown in the lower panel. The shaded blue band represents the statistical and systematic uncertainty on the prediction. Units are in GeV. |
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Figure 6:
Observed data events and SM background predictions for the high $ {\Delta m} $ search regions with $N_{\mathrm{ b } }= $ 0 (top left), $N_{\mathrm{ b } }= $ 1 (top right) and $N_{\mathrm{ b } }\geq $ 2 (bottom). The predictions shown do not include the effects of the maximum likelihood fit to the data. The ratio of observed data to prediction is shown in the lower panel of each plot. The shaded blue band represents the statistical and systematic uncertainty on the prediction. Units are in GeV. |
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Figure 6-a:
Observed data events and SM background predictions for the high $ {\Delta m} $ search regions with $N_{\mathrm{ b } }= $ 0. The predictions shown do not include the effects of the maximum likelihood fit to the data. The ratio of observed data to prediction is shown in the lower panel. The shaded blue band represents the statistical and systematic uncertainty on the prediction. Units are in GeV. |
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Figure 6-b:
Observed data events and SM background predictions for the high $ {\Delta m} $ search regions with $N_{\mathrm{ b } }= $ 1.The predictions shown do not include the effects of the maximum likelihood fit to the data. The ratio of observed data to prediction is shown in the lower panel. The shaded blue band represents the statistical and systematic uncertainty on the prediction. Units are in GeV. |
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Figure 6-c:
Observed data events and SM background predictions for the high $ {\Delta m} $ search regions with $N_{\mathrm{ b } }\geq $ 2. The predictions shown do not include the effects of the maximum likelihood fit to the data. The ratio of observed data to prediction is shown in the lower panel. The shaded blue band represents the statistical and systematic uncertainty on the prediction. Units are in GeV. |
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Figure 6-d:
Observed data events and SM background predictions for the high $ {\Delta m} $ search regions with $N_{\mathrm{ b } }\geq $ 2. The predictions shown do not include the effects of the maximum likelihood fit to the data. The ratio of observed data to prediction is shown in the lower panel. The shaded blue band represents the statistical and systematic uncertainty on the prediction. Units are in GeV. |
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Figure 7:
Exclusion limits at 95% CL for simplified models of top squark pair production in the pure $\tilde{ \mathrm{ t } } _{1}\to \mathrm{ t } \tilde{\chi}^0_1 $ ("T2tt'') decay scenario. The solid black curves represent the observed exclusion contours with respect to NLO+NLL cross section calculations [57] 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. The `islands' represent regions which are not excluded by the search. |
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Figure 8:
Exclusion limits at 95% CL for simplified models of top squark pair production in the pure $\tilde{ \mathrm{ t } } _{1}\to \mathrm{ b } \tilde{\chi}^{\pm}_1 \rightarrow \mathrm{ b } \mathrm{W}^{\pm } \tilde{\chi}^0_1 $ ("T2bW'') decay scenario. The solid black curves represent the observed exclusion contours with respect to NLO+NLL cross section calculations [57] 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 9:
Exclusion limits at 95% CL for simplified models of top squark pair production in the $\mathrm{ p } \mathrm{ p } \rightarrow \tilde{ \mathrm{ t } } _{1}\overline{ \tilde{ \mathrm{t} } } _{1}\rightarrow \mathrm{ \bar{t} } \tilde{\chi}^0_1 \mathrm{ b } \tilde{ \chi }^{+}_1 $ ("T2tb'') decay scenario, under the assumption of a compressed mass spectrum in which the mass of $\tilde{\chi}^{\pm}_1$ is only 5 GeV greater than that of $\tilde{\chi}^0_1 $. The solid black curves represent the observed exclusion contours with respect to NLO+NLL cross section calculations [57] 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 squark pair production in the pure $\tilde{ \mathrm{ t } } _{1} \to \mathrm{ b } \mathrm {f} \bar{\mathrm {f'}} \tilde{\chi}^0_1 $ ("T2ttC'') four-body decay scenario. The solid black curves represent the observed exclusion contours with respect to NLO+NLL cross section calculations [57] 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 squark pair production in the pure $\tilde{ \mathrm{ t } } _{1}\to \mathrm{ b } \tilde{\chi}^{\pm}_1 \to \mathrm{ b } \mathrm {f} \bar{\mathrm {f'}} \tilde{\chi}^0_1 $ ("T2bWC") decay scenario. The solid black curves represent the observed exclusion contours with respect to NLO+NLL cross section calculations [57] 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 12:
Exclusion limits at 95% CL for simplified models of top squark pair production in the pure $\tilde{ \mathrm{ t } } _{1}\to \mathrm{c} \tilde{\chi}^0_1 $ ("T2cc") decay scenario. The solid black curves represent the observed exclusion contours with respect to NLO+NLL cross section calculations [57] 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:
Summary of the 51 disjoint search regions that mainly target high ${\Delta m}$ signal models. The high $ {\Delta m} $ baseline selection is $N_{\text {j}}\geq $ 5, $ {E_{\mathrm {T}}^{\text {miss}}} > $ 250 GeV, zero leptons, $N_{\mathrm{ b } }\geq 1$, and $\Delta \phi _{1234}> $ 0.5. |
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Table 2:
Summary of the 53 disjoint search regions that mainly target low $ {\Delta m} $ signal models. The low $ {\Delta m} $ baseline selection is $N_{\text {j}}\geq $ 2, $ {E_{\mathrm {T}}^{\text {miss}}} > $ 250 GeV, zero leptons, $N_{\mathrm{ t } }=N_{\mathrm{ W } }=N_{\text {res}}= $ 0, $N_{\mathrm{ b } }\geq $ 0, $m_{\mathrm {T}}(\mathrm{ b } _{1,2}, {E_{\mathrm {T}}^{\text {miss}}} )< $ 175 GeV (when applicable), $|\Delta \phi (\text {j}_1, {E_{\mathrm {T}}} )|> 0.5, |\Delta \phi (\text {j}_{2,3}, {E_{\mathrm {T}}} )| > $ 0.15, $ {p_{\mathrm {T}}} (\text {ISR}) > $ 300 GeV, $ |\eta (\text {ISR})| < $ 2.4, $|\Delta \phi (j_{\text {ISR}}, {E_{\mathrm {T}}^{\text {miss}}} )|>$ 2, and $ {S_{E_{\mathrm {T}}\hspace {-0.8em}/\kern 0.45em} }> $ 10 GeV$ ^{1/2}$. |
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Table 3:
Summary of the validation region selections. |
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Table 4:
Range of systematic uncertainties [%] on the prediction across the different search regions. "Rare" includes diboson and ${{\mathrm{ t } {}\mathrm{ \bar{t} } } \mathrm{ Z } }$ processes. "Signal" shows the range of systematic uncertainties estimated using several benchmark signal models and points representative of the full set of signals. |
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Table 5:
Predicted background yields and the observation in different search regions for the low $ {\Delta m} $ analysis. The total uncertainty is given for each background prediction. |
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Table 6:
Predicted background yields and the observation in different search regions for the high $ {\Delta m} $ analysis. The total uncertainty is given for each background prediction. |
| Summary |
|
The results of a search for direct production of top squark pairs in the all-hadronic final state have been presented, based on data collected with the CMS detector in proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 35.9 fb$^{-1}$. The search is optimized for discovery in a wide range of signatures. No significant excess of events beyond the expected contribution from SM processes is observed, and exclusion limits are set at 95% confidence level in the context of simplified models [89,90,91] of direct top squark pair production. In the parameter space of larger mass differences between the $\tilde{ \mathrm{ t } }_1$ and $\tilde{\chi}^0_1$ when the $\tilde{ \mathrm{ t } }_1$ decays to an on-shell top quark and a neutralino, top squark masses up to 1040 GeV, and $\tilde{\chi}^0_1$ masses up to 500 GeV are probed. In models where the top squark decays to a bottom quark and a $\tilde{\chi}^{\pm}_1$, $\tilde{ \mathrm{ t } }_{1}$ masses up to 800 GeV, and $\tilde{\chi}^0_1$ masses up to 360 GeV are probed. Finally, the results are interpreted in scenarios where the branching fraction for each of the two top squark decay modes is 50%, under the assumption of a compressed mass spectrum in which the mass of $\tilde{\chi}^{\pm}_1$ is only 5 GeV greater than that of $\tilde{\chi}^0_1$. Top squark masses up to 940 GeV and $\tilde{\chi}^0_1$ masses up to 440 GeV are probed. In the parameter space of mass differences between the $\tilde{ \mathrm{ t } }_{1}$ and $\tilde{\chi}^0_1$ smaller than the mass of the W, top squark masses up to 580 GeV are probed for a neutralino mass of 540 GeV in the scenario where the $\tilde{ \mathrm{ t } }_{1}$ decays via a four body decay. An additional scenario relevant in this parameter space is where the top squark decays to a bottom quark and a $\tilde{\chi}^{\pm}_1$, which then decays to a virtual W and an $\tilde{\chi}^0_1$. In such a scenario top squark masses up to 660 GeV are probed for a neutralino mass of 610 GeV. In summary, the search provides sensitivity over a large region of the direct top squark parameter space. The new methods introduced in this search as well as the increase in the luminosity result in improved limits in the scenarios considered with respect to previous searches. |
| Additional Figures | |
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Additional Figure 1:
Expected significances for simplified models of top squark pair production in the pure $\tilde{ \mathrm{ t } } _{1}\to \mathrm{ t } \tilde{\chi}^0_1 $ ("T2tt") decay scenario. |
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Additional Figure 2:
Observed significances for simplified models of top squark pair production in the pure $\tilde{ \mathrm{ t } } _{1}\to \mathrm{ t } \tilde{\chi}^0_1 $ ("T2tt") decay scenario. |
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Additional Figure 3:
Expected significances for simplified models of top squark pair production in the pure $\tilde{ \mathrm{ t } } _{1}\to \mathrm{ b } \tilde{\chi}^{\pm}_1 \rightarrow \mathrm{ b } {\mathrm {W}}^{\pm } \tilde{\chi}^0_1 $ ("T2bW'') decay scenario. |
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Additional Figure 4:
Observed significances for simplified models of top squark pair production in the pure $\tilde{ \mathrm{ t } } _{1}\to \mathrm{ b } \tilde{\chi}^{\pm}_1 \rightarrow \mathrm{ b } {\mathrm {W}}^{\pm } \tilde{\chi}^0_1 $ ("T2bW'') decay scenario. |
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Additional Figure 5:
Expected significances for simplified models of top squark pair production in the $\mathrm{ p } \mathrm{ p } \rightarrow \tilde{ \mathrm{ t } } _{1}\overline{ \tilde{ \mathrm{t} } } _{1}\rightarrow \mathrm{ \bar{t} } \tilde{\chi}^0_1 \mathrm{ b } \tilde{ \chi }^{+}_{1} $ ("T2tb'') decay scenario, under the assumption of a compressed mass spectrum in which the mass of $\tilde{\chi}^{\pm}_1$ is only 5 GeV greater than that of $\tilde{\chi}^0_1 $. |
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Additional Figure 6:
Observed significances for simplified models of top squark pair production in the $\mathrm{ p } \mathrm{ p } \rightarrow \tilde{ \mathrm{ t } } _{1}\overline{ \tilde{ \mathrm{t} } } _{1}\rightarrow \mathrm{ \bar{t} } \tilde{\chi}^0_1 \mathrm{ b } \tilde{ \chi }^{+}_{1} $ ("T2tb'') decay scenario, under the assumption of a compressed mass spectrum in which the mass of $\tilde{\chi}^{\pm}_1$ is only 5 GeV greater than that of $\tilde{\chi}^0_1 $. |
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Additional Figure 7:
Expected significances for simplified models of top squark pair production in the $\tilde{ \mathrm{ t } } _{1} \to \mathrm{ b } \mathrm {f} \bar{\mathrm {f'}} \tilde{\chi}^0_1 $ ("T2ttC'') four-body decay scenario. |
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Additional Figure 8:
Observed significances for simplified models of top squark pair production in the $\tilde{ \mathrm{ t } } _{1} \to \mathrm{ b } \mathrm {f} \bar{\mathrm {f'}} \tilde{\chi}^0_1 $ ("T2ttC'') four-body decay scenario. |
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Additional Figure 9:
Expected significances for simplified models of top squark pair production in the $\tilde{ \mathrm{ t } } _{1}\to \mathrm{ b } \tilde{\chi}^{\pm}_1 \to \mathrm{ b } \mathrm {f} \bar{\mathrm {f'}} \tilde{\chi}^0_1 $ ("T2bWC") four-body decay scenario. |
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Additional Figure 10:
Observed significances for simplified models of top squark pair production in the $\tilde{ \mathrm{ t } } _{1}\to \mathrm{ b } \tilde{\chi}^{\pm}_1 \to \mathrm{ b } \mathrm {f} \bar{\mathrm {f'}} \tilde{\chi}^0_1 $ ("T2bWC") four-body decay scenario. |
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Additional Figure 11:
Expected significances for simplified models of top squark pair production in the $\tilde{ \mathrm{ t } } _{1}\to \mathrm{c} \tilde{\chi}^0_1 $ ("T2cc") decay scenario. |
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Additional Figure 12:
Observed significances for simplified models of top squark pair production in the $\tilde{ \mathrm{ t } } _{1}\to \mathrm{c} \tilde{\chi}^0_1 $ ("T2cc") decay scenario. |
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Additional Figure 13:
BDT efficiency of merged top tagging for reinterpretation objects. See reinterpretation material. |
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Additional Figure 14:
BDT efficiency of merged top misidentification rate for reinterpretation objects. See reinterpretation material. |
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Additional Figure 15:
BDT efficiency of merged W tagging for reinterpretation objects. See reinterpretation material. |
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Additional Figure 16:
BDT efficiency of merged W misidentification rate for reinterpretation objects. See reinterpretation material. |
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Additional Figure 17:
BDT efficiency of resolved top tagging for reinterpretation objects. See reinterpretation material. |
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Additional Figure 18:
BDT efficiency of resolved top misidentification rate for reinterpretation objects. See reinterpretation material. |
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Additional Figure 19:
Observed events and SM estimates for the super search regions defined for the low $ {\Delta m}$ category. The ratios of the observed data to the SM prediction derived from control regions (black points, with error bars corresponding to the data statistical uncertainty) are shown in the ratio plots. The shaded blue band represents the statistical and systematic uncertainty on the background prediction. The units of $ {p_{\mathrm {T}}} (\mathrm{ b } )$ and $m_{\mathrm {T}}(\mathrm{ b } _{1,2}, {E_{\mathrm {T}}^{\text {miss}}} )$ are GeV, where applicable. |
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Additional Figure 20:
Observed events and SM estimates for the super search regions defined for the high ${\Delta m}$ category. The ratios of the observed data to the SM prediction derived from control regions (black points, with error bars corresponding to the data statistical uncertainty) are shown in the ratio plots. The shaded blue band represents the statistical and systematic uncertainty on the background prediction. The units of $ {p_{\mathrm {T}}} (\mathrm{ b } )$ and $m_{\mathrm {T}}(\mathrm{ b } _{1,2}, {E_{\mathrm {T}}^{\text {miss}}} )$ are GeV, where applicable. |
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Additional Figure 21:
Correlation matrix of the background estimates between the 26 super search regions. This figure is available in electronic format in the additional materials. |
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Additional Figure 22:
Covariance matrix of the background estimates between the 26 super search regions. This figure is available in electronic format in the additional materials. |
| Additional Tables | |
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Additional Table 1:
Event yields from simulation, followed by the total selection efficiency with respect to the first row, after applying the sequential selections composing the low and high ${\Delta m}$ baseline selections. The offline trigger selection is firstly applied, followed by the lepton vetoes. Next, the high ${\Delta m}$ baseline selections are applied sequentially starting after the lepton vetoes. Finally, the low ${\Delta m}$ baseline selections are applied sequentially but starting again just after the lepton vetoes. The expected yields of three signal benchmark points are included. 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:
Predicted acceptance times efficiency in the super search regions of the low ${\Delta m}$ category for the T2ttC(500,450) signal benchmark point. The first column corresponds to the top and W objects used in the analysis; the second corresponds to the simplified top and W objects defined in the reinterpretation material. |
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Additional Table 3:
Predicted acceptance times efficiency in the super search regions of the high ${\Delta m}$ category for the T2tt(850,100) signal benchmark point. The first column corresponds to the top and W objects used in the analysis; the second corresponds to the simplified top and W objects defined in the reinterpretation material. |
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Additional Table 4:
Summary of the 10 disjoint super search regions in the low ${\Delta m}$ category. The low ${\Delta m}$ baseline selection is $N_{\text {j}}\geq $ 2, $ {E_{\mathrm {T}}^{\text {miss}}} > $ 250 GeV, zero leptons, $N_{\mathrm{ t } }=N_{ {\mathrm {W}}}=N_{\text {res}}= $ 0, $N_{\mathrm{ b } }\geq $ 0, $m_{\mathrm {T}}(\mathrm{ b } _{1,2}, {E_{\mathrm {T}}^{\text {miss}}} )< $ 175 GeV (when applicable), $|\Delta \phi (\text {j}_1, {E_{\mathrm {T}}} )|> $ 0.5, $|\Delta \phi (\text {j}_{2,3}, {E_{\mathrm {T}}} )| > $ 0.15, $ {p_{\mathrm {T}}} (\text {ISR}) > $ 300 GeV, $ |\eta (\text {ISR})| < $ 2.4, $|\Delta \phi (j_{\text {ISR}}, {E_{\mathrm {T}}^{\text {miss}}} )|> $ 2, and $ S_{E_{\mathrm {T}}} > $ 10 GeV$ ^{1/2}$. |
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Additional Table 5:
Summary of the 16 disjoint super search regions in the high ${\Delta m}$ category. The high ${\Delta m}$ baseline selection is $N_{\text {j}}\geq $ 5, $ {E_{\mathrm {T}}^{\text {miss}}} > $ 250 GeV, zero leptons, $N_{\mathrm{ b } }\geq $ 1, and $\Delta \phi _{1234}> $ 0.5. |
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Additional Table 6:
Predicted background yields and the observation in the super search regions of the low ${\Delta m}$ category. The total uncertainty is given for each background prediction. |
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Additional Table 7:
Predicted background yields and the observation in the super search regions of the high ${\Delta m}$ category. The total uncertainty is given for each background prediction. |
| Additional material and instructions needed for reinterpretation here. |
| References | ||||
| 1 | ATLAS Collaboration | Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC | PLB 716 (2012) 1 | 1207.7214 |
| 2 | CMS Collaboration | Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC | PLB 716 (2012) 30 | CMS-HIG-12-028 1207.7235 |
| 3 | CMS Collaboration | Observation of a new boson with mass near 125 GeV in pp collisions at $ \sqrt{s} = $ 7 and 8 TeV | JHEP 06 (2013) 081 | CMS-HIG-12-036 1303.4571 |
| 4 | ATLAS Collaboration | Measurement of the Higgs boson mass from the $ \textrm{H}\rightarrow \gamma\gamma $ and $ \textrm{H} \rightarrow \textrm{ZZ}^{*} \rightarrow 4\textrm{l} $ channels with the ATLAS detector using 25 fb$ ^{-1} $ of $ \textrm{pp} $ collision data | PRD 90 (2014) 052004 | 1406.3827 |
| 5 | CMS Collaboration | Precise determination of the mass of the Higgs boson and tests of compatibility of its couplings with the standard model predictions using proton collisions at 7 and 8 TeV | EPJC 75 (2015) 212 | CMS-HIG-14-009 1412.8662 |
| 6 | ATLAS and CMS Collaborations | Combined Measurement of the Higgs Boson Mass in $ pp $ Collisions at $ \sqrt{s} = $ 7 and 8 TeV with the ATLAS and CMS Experiments | PRL 114 (2015) 191803 | 1503.07589 |
| 7 | G. 't Hooft | Naturalness, chiral symmetry, and spontaneous chiral symmetry breaking | NATO Sci. Ser. B 59 (1980)135 | |
| 8 | E. Witten | Dynamical Breaking of Supersymmetry | Nucl. Phys. B 188 (1981) 513 | |
| 9 | M. Dine, W. Fischler, and M. Srednicki | Supersymmetric Technicolor | Nucl. Phys. B 189 (1981) 575 | |
| 10 | S. Dimopoulos and S. Raby | Supercolor | Nucl. Phys. B 192 (1981) 353 | |
| 11 | S. Dimopoulos and H. Georgi | Softly Broken Supersymmetry and SU(5) | Nucl. Phys. B 193 (1981) 150 | |
| 12 | R. K. Kaul and P. Majumdar | Cancellation of quadratically divergent mass corrections in globally supersymmetric spontaneously broken gauge theories | Nucl. Phys. B 199 (1982) 36 | |
| 13 | F. Zwicky | Die Rotverschiebung von extragalaktischen Nebeln | Helv. Phys. Acta 6 (1933) 110 | |
| 14 | V. C. Rubin and J. Ford, W. Kent | Rotation of the Andromeda Nebula from a Spectroscopic Survey of Emission Regions | Astrophys. J. 159 (1970) 379 | |
| 15 | M. Drees and G. Gerbier | Mini-Review of Dark Matter: 2012 | 1204.2373 | |
| 16 | R. Barbieri and G. F. Giudice | Upper bounds on supersymmetric particle masses | Nucl. Phys. B 306 (1988) 63 | |
| 17 | B. de Carlos and J. A. Casas | One loop analysis of the electroweak breaking in supersymmetric models and the fine tuning problem | PLB 309 (1993) 320 | hep-ph/9303291 |
| 18 | S. Dimopoulos and G. F. Giudice | Naturalness constraints in supersymmetric theories with nonuniversal soft terms | PLB 357 (1995) 573 | hep-ph/9507282 |
| 19 | R. Barbieri, G. R. Dvali, and L. J. Hall | Predictions from a U(2) flavor symmetry in supersymmetric theories | PLB 377 (1996) 76 | hep-ph/9512388 |
| 20 | L. Evans and P. Bryant (editors) | LHC Machine | JINST 3 (2008) S08001 | |
| 21 | J. Wess and B. Zumino | Supergauge Transformations in Four-Dimensions | Nucl. Phys. B 70 (1974) 39 | |
| 22 | G. R. Farrar and P. Fayet | Phenomenology of the Production, Decay, and Detection of New Hadronic States Associated with Supersymmetry | PLB 76 (1978) 575 | |
| 23 | J. L. Feng | Dark Matter Candidates from Particle Physics and Methods of Detection | Ann. Rev. Astron. Astrophys. 48 (2010) 495 | 1003.0904 |
| 24 | ATLAS Collaboration | Search for a supersymmetric partner to the top quark in final states with jets and missing transverse momentum at $ \sqrt{s} = $ 7 TeV with the ATLAS detector | PRL 109 (2012) 211802 | 1208.1447 |
| 25 | ATLAS Collaboration | Search for direct top squark pair production in final states with one isolated lepton, jets, and missing transverse momentum in $ \sqrt{s} = $ 7 TeV $ pp $ collisions using 4.7 fb$^{-1} $ of ATLAS data | PRL 109 (2012) 211803 | 1208.2590 |
| 26 | ATLAS Collaboration | Search for a heavy top-quark partner in final states with two leptons with the ATLAS detector at the LHC | JHEP 11 (2012) 094 | 1209.4186 |
| 27 | ATLAS Collaboration | Search for direct top-squark pair production in final states with two leptons in pp collisions at $ \sqrt{s}= $ 8 TeV with the ATLAS detector | JHEP 06 (2014) 124 | 1403.4853 |
| 28 | ATLAS Collaboration | Search for direct third-generation squark pair production in final states with missing transverse momentum and two b-jets in $ \sqrt{s} = $ 8 TeV $ pp $ collisions with the ATLAS detector | JHEP 10 (2013) 189 | 1308.2631 |
| 29 | ATLAS Collaboration | Measurement of Spin Correlation in Top-Antitop Quark Events and Search for Top Squark Pair Production in pp Collisions at $ \sqrt{s}= $ 8 TeV Using the ATLAS Detector | PRL 114 (2015) 142001 | 1412.4742 |
| 30 | ATLAS Collaboration | Search for pair-produced third-generation squarks decaying via charm quarks or in compressed supersymmetric scenarios in $ pp $ collisions at $ \sqrt{s}=8 $TeV with the ATLAS detector | PRD 90 (2014) 052008 | 1407.0608 |
| 31 | ATLAS Collaboration | ATLAS Run 1 searches for direct pair production of third-generation squarks at the Large Hadron Collider | EPJC 75 (2015) 510, , [Erratum: Eur. Phys. J. C $76$ (2016) 153] | 1506.08616 |
| 32 | CMS Collaboration | Search for top-squark pair production in the single-lepton final state in pp collisions at $ \sqrt{s} = $ 8 TeV | EPJC 73 (2013) 2677 | CMS-SUS-13-011 1308.1586 |
| 33 | CMS Collaboration | Search for supersymmetry in hadronic final states with missing transverse energy using the variables $ \alpha_\mathrm{T} $ and b-quark multiplicity in pp collisions at $ \sqrt{s} = $ 8 TeV | EPJC 73 (2013) 2568 | CMS-SUS-12-028 1303.2985 |
| 34 | CMS Collaboration | Search for supersymmetry using razor variables in events with $ b $-tagged jets in $ pp $ collisions at $ \sqrt{s} = $ 8 TeV | PRD 91 (2015) 052018 | CMS-SUS-13-004 1502.00300 |
| 35 | CMS Collaboration | Searches for third-generation squark production in fully hadronic final states in proton-proton collisions at $ \sqrt{s}= $ 8 TeV | JHEP 06 (2015) 116 | CMS-SUS-14-001 1503.08037 |
| 36 | CMS Collaboration | Search for direct pair production of supersymmetric top quarks decaying to all-hadronic final states in pp collisions at $ \sqrt{s}= $ 8 TeV | EPJC 76 (2016) 460 | CMS-SUS-13-023 1603.00765 |
| 37 | ATLAS Collaboration | Search for top squarks in final states with one isolated lepton, jets, and missing transverse momentum in $ \sqrt{s}= $ 13 TeV $ pp $ collisions with the ATLAS detector | PRD 94 (2016) 052009 | 1606.03903 |
| 38 | CMS Collaboration | Search for new physics with the M$ _{T2} $ variable in all-jets final states produced in pp collisions at $ \sqrt{s}= $ 13 TeV | JHEP 10 (2016) 006 | CMS-SUS-15-003 1603.04053 |
| 39 | CMS Collaboration | Inclusive search for supersymmetry using razor variables in pp collisions at $ \sqrt{s}= $ 13 TeV | PRD 95 (2017) 012003 | CMS-SUS-15-004 1609.07658 |
| 40 | CMS Collaboration | A search for new phenomena in pp collisions at $ \sqrt{s} = $ 13 TeV in final states with missing transverse momentum and at least one jet using the $ {\alpha_{\mathrm{T}}} $ variable | Submitted to: EPJC (2016) | CMS-SUS-15-005 1611.00338 |
| 41 | CMS Collaboration | Searches for pair production for third-generation squarks in $ \sqrt{s}= $ 13 TeV pp collisions | Submitted to: EPJC (2016) | CMS-SUS-16-008 1612.03877 |
| 42 | D0 Collaboration | Search for 3- and 4-body decays of the scalar top quark in $ \text{p}\bar{\text{p}} $ collisions at $ \sqrt{s} = $ 1.8 TeV | PLB 581 (2004) 147 | |
| 43 | D0 Collaboration | Search for pair production of the scalar top quark in muon+tau final states | PLB 710 (2012) 578 | 1202.1978 |
| 44 | D0 Collaboration | Search for the lightest scalar top quark in events with two leptons in $ \text{p}\bar{\text{p}} $ collisions at $ \sqrt{s} = $ 1.96 TeV | PLB 659 (2008) 500 | 0707.2864 |
| 45 | CDF Collaboration | Search for the supersymmetric partner of the top quark in $ \mathrm{p}\bar{\mathrm{p}} $ collisions at $ \sqrt{s} = $ 1.96 TeV | PRD 82 (2010) 092001 | 1009.0266 |
| 46 | CDF Collaboration | Search for the supersymmetric partner of the top quark in dilepton events from $ \mathrm{p}\bar{\mathrm{p}} $ collisions at $ \sqrt{s} = $ 1.8 TeV | PRL 90 (2003) 251801 | hep-ex/0302009 |
| 47 | C. Balazs, M. Carena, and C. E. M. Wagner | Dark matter, light stops and electroweak baryogenesis | PRD 70 (2004) 015007 | hep-ph/0403224 |
| 48 | CMS Collaboration | The CMS experiment at the CERN LHC | JINST 3 (2008) S08004 | CMS-00-001 |
| 49 | J. Alwall et al. | The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations | JHEP 07 (2014) 079 | 1405.0301 |
| 50 | NNPDF Collaboration | Parton distributions for the LHC Run II | JHEP 04 (2015) 040 | 1410.8849 |
| 51 | P. Nason | A New method for combining NLO QCD with shower Monte Carlo algorithms | JHEP 11 (2004) 040 | hep-ph/0409146 |
| 52 | S. Frixione, P. Nason, and C. Oleari | Matching NLO QCD computations with Parton Shower simulations: the POWHEG method | JHEP 11 (2007) 070 | 0709.2092 |
| 53 | S. Alioli, P. Nason, C. Oleari, and E. Re | A general framework for implementing NLO calculations in shower Monte Carlo programs: the POWHEG BOX | JHEP 06 (2010) 043 | 1002.2581 |
| 54 | E. Re | Single-top Wt-channel production matched with parton showers using the POWHEG method | EPJC 71 (2011) 1547 | 1009.2450 |
| 55 | T. Sjostrand, S. Mrenna, and P. Z. Skands | A Brief Introduction to PYTHIA 8.1 | CPC 178 (2008) 852--867 | 0710.3820 |
| 56 | M. Bahr et al. | Herwig++ Physics and Manual | EPJC 58 (2008) 639--707 | 0803.0883 |
| 57 | C. Borschensky et al. | Squark and gluino production cross sections in pp collisions at $ \sqrt{s} = $ 13, 14, 33 and 100 TeV | EPJC 74 (2014) 3174 | 1407.5066 |
| 58 | CMS Collaboration | Measurement of the $ \mathrm{t}\overline{{\mathrm{t}}} $ production cross section in the all-jets final state in pp collisions at $ \sqrt{s}= $ 8 TeV | EPJC 76 (2016) 128 | CMS-TOP-14-018 1509.06076 |
| 59 | GEANT4 Collaboration | GEANT4---a simulation toolkit | NIMA 506 (2003) 250 | |
| 60 | S. Abdullin et al. | The fast simulation of the CMS detector at LHC | J. Phys. Conf. Ser. 331 (2011) 032049 | |
| 61 | CMS Collaboration | Particle-Flow Event Reconstruction in CMS and Performance for Jets, Taus, and $ E_{\mathrm{T}}^{\text{miss}} $ | CDS | |
| 62 | M. Cacciari, G. P. Salam, and G. Soyez | The anti-$ k_t $ jet clustering algorithm | JHEP 04 (2008) 063 | 0802.1189 |
| 63 | M. Cacciari and G. P. Salam | Pileup subtraction using jet areas | PLB 659 (2008) 119--126 | 0707.1378 |
| 64 | CMS Collaboration | Study of Pileup Removal Algorithms for Jets | CMS-PAS-JME-14-001 | CMS-PAS-JME-14-001 |
| 65 | CMS Collaboration | Jet energy scale and resolution in the CMS experiment in pp collisions at 8 TeV | CDS | |
| 66 | CMS Collaboration | Identification of b-quark jets with the CMS experiment | JINST 8 (2013) P04013 | CMS-BTV-12-001 1211.4462 |
| 67 | CMS Collaboration | Performance of $ \mathrm{b } $ tagging at $ \sqrt{s} = $ 8 TeV in multijet, $ \mathrm{ t \bar{t} } $ and boosted topology events | CMS-PAS-BTV-13-001 | CMS-PAS-BTV-13-001 |
| 68 | CMS Collaboration | Performance of electron reconstruction and selection with the CMS detector in proton-proton collisions at $ \sqrt{s} = $ 8 TeV | JINST 10 (2015) P06005 | CMS-EGM-13-001 1502.02701 |
| 69 | CMS Collaboration | Performance of CMS muon reconstruction in $ pp $ collision events at $ \sqrt{s} = $ 7 TeV | JINST 7 (2012) P10002 | CMS-MUO-10-004 1206.4071 |
| 70 | CMS Collaboration | Performance of Photon Reconstruction and Identification with the CMS Detector in Proton-Proton Collisions at $ \sqrt{s} = $ 8 TeV | JINST 10 (2015) P08010 | CMS-EGM-14-001 1502.02702 |
| 71 | Y. L. Dokshitzer, G. D. Leder, S. Moretti, and B. R. Webber | Better jet clustering algorithms | JHEP 08 (1997) 001 | hep-ph/9707323 |
| 72 | A. J. Larkoski, S. Marzani, G. Soyez, and J. Thaler | Soft Drop | JHEP 05 (2014) 146 | 1402.2657 |
| 73 | J. Thaler and K. Van Tilburg | Maximizing Boosted Top Identification by Minimizing N-subjettiness | JHEP 1202 (2012) 093 | 1108.2701 |
| 74 | CMS Collaboration | Performance of quark/gluon discrimination in 8 TeV pp data | CMS-PAS-JME-13-002 | CMS-PAS-JME-13-002 |
| 75 | A. Hoecker et al. | TMVA: Toolkit for Multivariate Data Analysis | PoS ACAT (2007) 040 | physics/0703039 |
| 76 | CMS Collaboration | Identification of c-quark jets at the CMS experiment | CMS-PAS-BTV-16-001 | CMS-PAS-BTV-16-001 |
| 77 | CMS Collaboration | Identification of double-b quark jets in boosted event topologies | CMS-PAS-BTV-15-002 | CMS-PAS-BTV-15-002 |
| 78 | B. Efron | The Jackknife, The Bootstrap and Other Resampling Plans | volume 38 of CBMS-NSF Regional Conference Series in Applied Mathematics SIAM, Philadelphia, 1982 ISBN 978-0-898711-79-0 | |
| 79 | CMS Collaboration | Observation of top quark pairs produced in association with a vector boson in pp collisions at $ \sqrt{s}= $ 8 TeV | JHEP 01 (2016) 096 | CMS-TOP-14-021 1510.01131 |
| 80 | ATLAS Collaboration | Measurement of the $ ZZ $ production cross section in proton-proton collisions at $ \sqrt s = $ 8 TeV using the $ ZZ\to\ell^{-}\ell^{+}\ell^{\prime -}\ell^{\prime +} $ and $ ZZ\to\ell^{-}\ell^{+}\nu\bar{\nu} $ channels with the ATLAS detector | JHEP 01 (2017) 099 | 1610.07585 |
| 81 | CMS Collaboration | Measurement of the WZ production cross section in pp collisions at $ \sqrt s = $ 13 TeV | PLB 766 (2017) 268 | CMS-SMP-16-002 1607.06943 |
| 82 | S. Catani, D. de Florian, M. Grazzini, and P. Nason | Soft gluon resummation for Higgs boson production at hadron colliders | JHEP 07 (2003) 028 | hep-ph/0306211 |
| 83 | M. Cacciari et al. | The $ \mathrm{ t \bar{t} } $ cross-section at 1.8 TeV and 1.96 TeV: a study of the systematics due to parton densities and scale dependence | JHEP 04 (2004) 068 | hep-ph/0303085 |
| 84 | A. L. Read | Presentation of search results: The $ CL_s $ technique | JPG 28 (2002) 2693 | |
| 85 | T. Junk | Confidence level computation for combining searches with small statistics | NIMA 434 (1999) 435 | hep-ex/9902006 |
| 86 | ATLAS and CMS Collaborations | Procedure for the LHC Higgs boson search combination in summer 2011 | Technical Report ATL-PHYS-PUB-2011-011, CMS NOTE-2011/005 | |
| 87 | G. Cowan, K. Cranmer, E. Gross, and O. Vitells | Asymptotic formulae for likelihood-based tests of new physics | EPJC 71 (2011) 1554, , [Erratum: Eur. Phys. J.C73,2501(2013)] | 1007.1727 |
| 88 | R. Groeber, M. M. Muehlleitner, E. Popenda, and A. Wlotzka | Light Stop Decays: Implications for LHC Searches | EPJC 75 (2015) 420 | 1408.4662 |
| 89 | J. Alwall, P. Schuster, and N. Toro | Simplified Models for a First Characterization of New Physics at the LHC | PRD 79 (2009) 075020 | 0810.3921 |
| 90 | J. Alwall, M.-P. Le, M. Lisanti, and J. G. Wacker | Model-Independent Jets plus Missing Energy Searches | PRD 79 (2009) 015005 | 0809.3264 |
| 91 | LHC New Physics Working Group Collaboration | Simplified Models for LHC New Physics Searches | JPG 39 (2012) 105005 | 1105.2838 |
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