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| CMS-PAS-SUS-16-035 | ||
| Search for beyond the standard model physics in events with two leptons of the same sign, missing transverse momentum, and jets in proton-proton collisions at $ \sqrt{s} = $ 13 TeV | ||
| CMS Collaboration | ||
| March 2017 | ||
| Abstract: A data sample of events from proton-proton collisions with two isolated same-sign leptons, missing transverse momentum, and jets is studied in a search for signatures of new physics phenomena by the CMS Collaboration at the LHC. The integrated luminosity of the data set is 35.9 fb$^{-1}$ and the center-of-mass energy of the collisions is 13 TeV. The properties of the events are well described by the expectations from the standard model processes. Exclusion limits at 95% confidence level are set on the pair production of gluinos, squarks, and same-sign top quarks, as well as top quark associated production of a heavy scalar or pseudoscalar boson decaying to top quarks, and on the standard model production of events with four top quarks. Additionally, model-independent limits in several topological regions are provided, allowing for further interpretations of the results. | ||
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Links:
CDS record (PDF) ;
inSPIRE record ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, EPJC 77 (2017) 578. The superseded preliminary plots can be found here.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 for CMS speakers can be found here |
| Figures | |
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Figure 1:
Diagrams illustrating the simplified SUSY models considered in this analysis. |
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Figure 2:
Diagrams for scalar (pseudoscalar) production in association with top quarks. |
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Figure 3:
Distributions of the main analysis variables: $ {H_{\mathrm {T}}} $ (a), $ {E_{\mathrm {T}}^{\text {miss}}} $ (b), $ {m_\text {T}^{\text {min}}} $ (c), $ {N_\text {jets}} $ (d), and $ {N_\text {b}} $ (e), after the baseline selection requiring a pair of SS leptons, two jets, and $ {E_{\mathrm {T}}^{\text {miss}}} > $ 50 GeV. The last bin includes the overflow and the hatched area represents the total uncertainty in the background prediction. The upper panels show the ratio of the observed event yield to the background prediction. |
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Figure 3-a:
Distribution of the $ {H_{\mathrm {T}}} $ variable, after the baseline selection requiring a pair of SS leptons, two jets, and $ {E_{\mathrm {T}}^{\text {miss}}} > $ 50 GeV. The last bin includes the overflow and the hatched area represents the total uncertainty in the background prediction. The upper panel shows the ratio of the observed event yield to the background prediction. |
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Figure 3-b:
Distribution of the $ {E_{\mathrm {T}}^{\text {miss}}} $ variable, after the baseline selection requiring a pair of SS leptons, two jets, and $ {E_{\mathrm {T}}^{\text {miss}}} > $ 50 GeV. The last bin includes the overflow and the hatched area represents the total uncertainty in the background prediction. The upper panel shows the ratio of the observed event yield to the background prediction. |
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Figure 3-c:
Distribution of the $ {m_\text {T}^{\text {min}}} $ variable, after the baseline selection requiring a pair of SS leptons, two jets, and $ {E_{\mathrm {T}}^{\text {miss}}} > $ 50 GeV. The last bin includes the overflow and the hatched area represents the total uncertainty in the background prediction. The upper panel shows the ratio of the observed event yield to the background prediction. |
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Figure 3-d:
Distribution of the $ {N_\text {jets}} $ variable, after the baseline selection requiring a pair of SS leptons, two jets, and $ {E_{\mathrm {T}}^{\text {miss}}} > $ 50 GeV. The last bin includes the overflow and the hatched area represents the total uncertainty in the background prediction. The upper panel shows the ratio of the observed event yield to the background prediction. |
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Figure 3-e:
Distribution of the $ {N_\text {b}} $ variable, after the baseline selection requiring a pair of SS leptons, two jets, and $ {E_{\mathrm {T}}^{\text {miss}}} > $ 50 GeV. The last bin includes the overflow and the hatched area represents the total uncertainty in the background prediction. The upper panel shows the ratio of the observed event yield to the background prediction. |
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Figure 4:
Event yields in the HH(a), HL(b), and LL(c) SRs. The hatched area represents the total uncertainty in the background prediction. |
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Figure 4-a:
Event yields in the HH SRs. The hatched area represents the total uncertainty in the background prediction. |
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Figure 4-b:
Event yields in the HL SRs. The hatched area represents the total uncertainty in the background prediction. |
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Figure 4-c:
Event yields in the LL SRs. The hatched area represents the total uncertainty in the background prediction. |
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Figure 5:
Exclusion regions at 95% CL in the $m_{ {\tilde{\chi }^0_1} }$ versus $m_{ {\tilde{\mathrm {g}}} }$ plane for the T1tttt (a), T5ttbbWW (b) models with off-shell third generation quarks, and the T5tttt (c) and T5ttcc (d) models, with on-shell third generation quarks. For the T5ttbbWW model, $m_{ {\tilde{\chi }^\pm } } = m_{ {\tilde{\chi }^0_1} } $ + 5 GeV, for the T5tttt model, $m_{ {\tilde{\mathrm {t}}} } - m_{ {\tilde{\chi }^0_1} } = m_{\mathrm{ t } }$, and for the T5ttcc model, $m_{ {\tilde{\mathrm {t}}} } - m_{ {\tilde{\chi }^0_1} } = $ 20 GeV and the decay proceeds through $ {\tilde{\mathrm {t}}} \rightarrow \mathrm{c} {\tilde{\chi }^0_1} $. The right-hand side color scale indicates the excluded cross section values for a given point in the SUSY particle mass plane. The solid, black curves represent the observed exclusion limits assuming the NLO+NLL cross sections [44,45,46,47,48,49] (thick line), or their variations of $\pm$1 standard deviation (thin lines). The dashed, red curves show the expected limits with the corresponding $\pm$1 and $\pm$2 standard deviation experimental uncertainties. Excluded regions are to the left and below the limit curves. |
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Figure 5-a:
Exclusion regions at 95% CL in the $m_{ {\tilde{\chi }^0_1} }$ versus $m_{ {\tilde{\mathrm {g}}} }$ plane for the T1tttt model with off-shell third generation quarks. The right-hand side color scale indicates the excluded cross section values for a given point in the SUSY particle mass plane. The solid, black curves represent the observed exclusion limits assuming the NLO+NLL cross sections [44,45,46,47,48,49] (thick line), or their variations of $\pm$1 standard deviation (thin lines). The dashed, red curves show the expected limits with the corresponding $\pm$1 and $\pm$2 standard deviation experimental uncertainties. Excluded regions are to the left and below the limit curves. |
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Figure 5-b:
Exclusion regions at 95% CL in the $m_{ {\tilde{\chi }^0_1} }$ versus $m_{ {\tilde{\mathrm {g}}} }$ plane for the T5ttbbWW model with off-shell third third generation quarks, and $m_{ {\tilde{\chi }^\pm } } = m_{ {\tilde{\chi }^0_1} } $ + 5 GeV. The right-hand side color scale indicates the excluded cross section values for a given point in the SUSY particle mass plane. The solid, black curves represent the observed exclusion limits assuming the NLO+NLL cross sections [44,45,46,47,48,49] (thick line), or their variations of $\pm$1 standard deviation (thin lines). The dashed, red curves show the expected limits with the corresponding $\pm$1 and $\pm$2 standard deviation experimental uncertainties. Excluded regions are to the left and below the limit curves. |
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Figure 5-c:
Exclusion regions at 95% CL in the $m_{ {\tilde{\chi }^0_1} }$ versus $m_{ {\tilde{\mathrm {g}}} }$ plane for the T5tttt model, with on-shell third generation quarks, and $m_{ {\tilde{\mathrm {t}}} } - m_{ {\tilde{\chi }^0_1} } = m_{\mathrm{ t } }$. The right-hand side color scale indicates the excluded cross section values for a given point in the SUSY particle mass plane. The solid, black curves represent the observed exclusion limits assuming the NLO+NLL cross sections [44,45,46,47,48,49] (thick line), or their variations of $\pm$1 standard deviation (thin lines). The dashed, red curves show the expected limits with the corresponding $\pm$1 and $\pm$2 standard deviation experimental uncertainties. Excluded regions are to the left and below the limit curves. |
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Figure 5-d:
Exclusion regions at 95% CL in the $m_{ {\tilde{\chi }^0_1} }$ versus $m_{ {\tilde{\mathrm {g}}} }$ plane for the T5ttcc model, with on-shell third generation quarks, $m_{ {\tilde{\mathrm {t}}} } - m_{ {\tilde{\chi }^0_1} } = $ 20 GeV and the decay proceeds through $ {\tilde{\mathrm {t}}} \rightarrow \mathrm{c} {\tilde{\chi }^0_1} $. The right-hand side color scale indicates the excluded cross section values for a given point in the SUSY particle mass plane. The solid, black curves represent the observed exclusion limits assuming the NLO+NLL cross sections [44,45,46,47,48,49] (thick line), or their variations of $\pm$1 standard deviation (thin lines). The dashed, red curves show the expected limits with the corresponding $\pm$1 and $\pm$2 standard deviation experimental uncertainties. Excluded regions are to the left and below the limit curves. |
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Figure 6:
Exclusion regions at 95% CL in the plane of $m_{ {\tilde{\chi }^0_1} }$ versus $m_{ {\tilde{\mathrm {g}}} }$ for the T5qqqqWW model with $m_{ {\tilde{\chi }^\pm } }=0.5(m_{ {\tilde{\mathrm {g}}} } + m_{ {\tilde{\chi }^0_1} })$ (a) and with $m_{ {\tilde{\chi }^\pm } } = m_{ {\tilde{\chi }^0_1} }$ + 20 GeV (b). For a description of the notation, see Fig. 5. |
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Figure 6-a:
Exclusion regions at 95% CL in the plane of $m_{ {\tilde{\chi }^0_1} }$ versus $m_{ {\tilde{\mathrm {g}}} }$ for the T5qqqqWW model with $m_{ {\tilde{\chi }^\pm } }=0.5(m_{ {\tilde{\mathrm {g}}} } + m_{ {\tilde{\chi }^0_1} })$. For a description of the notation, see Fig. 5. |
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Figure 6-b:
Exclusion regions at 95% CL in the plane of $m_{ {\tilde{\chi }^0_1} }$ versus $m_{ {\tilde{\mathrm {g}}} }$ for the T5qqqqWW model with $m_{ {\tilde{\chi }^\pm } } = m_{ {\tilde{\chi }^0_1} }$ + 20 GeV (b). For a description of the notation, see Fig. 5. |
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Figure 7:
Exclusion regions at 95% CL in the plane of $m_{ {\tilde{\chi }^\pm } }$ versus $m_{ {\tilde{\mathrm {b}}} }$ for the T6ttWW model with $m_{ {\tilde{\chi }^0_1} }=$ 50 GeV. For a description of the notation, see Fig. 5. |
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Figure 8:
Limits on the production cross section for heavy scalar (left) and pseudoscalar (right) boson in association to one or two top quarks, followed by its decay to top quarks, as a function of the (pseudo)scalar mass. The red line corresponds to the cross section in the (pseudo)scalar model. |
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Figure 8-a:
Limits on the production cross section for heavy scalar boson in association to one or two top quarks, followed by its decay to top quarks, as a function of the scalar mass. The red line corresponds to the cross section in the scalar model. |
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Figure 8-b:
Limits on the production cross section for heavy pseudoscalar boson in association to one or two top quarks, followed by its decay to top quarks, as a function of the pseudoscalar mass. The red line corresponds to the cross section in the pseudoscalar model. |
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Figure 9:
Limits on the product of cross section, detector acceptance, and selection efficiency, $\sigma \mathcal {A} \epsilon $, for the production of an SS dilepton pair as a function of $ {E_{\mathrm {T}}^{\text {miss}}} $ (left) and of $ {H_{\mathrm {T}}} $ (right). |
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Figure 9-a:
Limits on the product of cross section, detector acceptance, and selection efficiency, $\sigma \mathcal {A} \epsilon $, for the production of an SS dilepton pair as a function of $ {E_{\mathrm {T}}^{\text {miss}}} $. |
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Figure 9-b:
Limits on the product of cross section, detector acceptance, and selection efficiency, $\sigma \mathcal {A} \epsilon $, for the production of an SS dilepton pair as a function of $ {H_{\mathrm {T}}} $. |
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Figure 10:
Correlations between the background predictions in the 15 exclusive regions defined in Section {sec:aggregate}. |
| Tables | |
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Table 1:
Kinematic requirements for leptons and jets. |
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Table 2:
Signal region definitions for the HH selection. Regions split by charge are indicated with ($++$) and ($--$). |
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Table 3:
Signal region definitions for the HL selection. Regions split by charge are indicated with ($++$) and ($--$). |
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Table 4:
Signal region definitions for the LL selection. All SRs in this category require $ {N_\text {jets}} \geq $ 2. |
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Table 5:
Summary of the sources of uncertainties and their effect on the yields of different processes in the signal regions. The first two groups list experimental and theoretical uncertainties assigned to processes estimated using simulation, while the last group lists uncertainties assigned to processes whose yield is estimated from data. The uncertainties in the first group also apply to signal samples. Reported values are representative for the most relevant signal regions. |
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Table 6:
Expected number of background and observed events for the different SRs considered in this analysis. |
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Table 7:
Inclusive SR definitions, expected background yields, and observed yields, as well the observed 95% CL upper limits on the number of signal events contributing to each region. No uncertainty in the signal acceptance is assumed in calculating these limits. A dash in the selections means that the selection is not applied. |
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Table 8:
Exclusive SR definitions, expected background yields, and observed yields. |
| Summary |
| A same-sign dilepton sample corresponding to an integrated luminosity of 35.9 fb$^{-1}$ of proton-proton collisions at 13 TeV has been studied to search for manifestations of BSM physics. The data are found to be consistent with the standard model expectations. The results are interpreted as limits on the cross sections for production of new particles from simplified supersymmetric models. Using calculations for these cross sections as a function of particle mass, these limits have been turned into lower mass limits that are as high 1.5 TeV for gluinos and 0.83 TeV for bottom squarks, depending on the detail of the model. Limits are also provided on the production of heavy scalar and pseudoscalar bosons in the context of two Higgs doublet models, as well as on same-sign top quark pair production, and the standard model production of four top quarks. Finally, to facilitate further interpretations of the search, model-independent limits are provided as a function of $H_{\mathrm{T}}$ and $E_{\mathrm{T}}^{\text{miss}}$, together with the background prediction and data yields in a smaller set of signal regions. |
| Additional Figures | |
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Additional Figure 1:
Event yields in the HH search regions for a few SUSY signal models. |
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Additional Figure 2:
Event yields in the HH search regions for a low- and high-mass scalar boson production in association to one or two top quarks, followed by its decay to top quarks. |
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Additional Figure 3:
Distribution of the leading lepton $ {p_{\mathrm {T}}} $ after the baseline selection, where the last bin includes the overflow. The hatched area represents the total uncertainty in the background prediction. The upper panels show the ratio of the observed event yield and the background prediction. |
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Additional Figure 4:
Distribution of the subleading lepton $ {p_{\mathrm {T}}} $ after the baseline selection, where the last bin includes the overflow. The hatched area represents the total uncertainty in the background prediction. The upper panels show the ratio of the observed event yield and the background prediction. |
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Additional Figure 5:
Observed siginificance in the $m_{ \tilde{\chi }^0_1} $ versus $m_{ \tilde{\mathrm {g}}} $ plane for the T5qqqqWW model with $m_{ \tilde{\chi }^\pm } =0.5(m_{ \tilde{\mathrm {g}}} + m_{ \tilde{\chi }^0_1} )$. |
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Additional Figure 6:
Observed significance in the $m_{ \tilde{\chi }^0_1} $ versus $m_{ \tilde{\mathrm {g}}} $ plane for the T5qqqqWW model with $m_{ \tilde{\chi }^\pm } =m_{ \tilde{\chi }^0_1} $ + 20 GeV. |
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Additional Figure 7:
Observed significance in the $m_{ \tilde{\chi }^0_1} $ versus $m_{ \tilde{\mathrm {g}}} $ plane for the Ttttt model. |
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Additional Figure 8:
Observed significance in the $m_{ \tilde{\chi }^0_1} $ versus $m_{ \tilde{\mathrm {g}}} $ plane for the T5ttbbWW model. |
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Additional Figure 9:
Observed significance in the $m_{ \tilde{\chi }^0_1} $ versus $m_{ \tilde{\mathrm {g}}} $ plane for the T5tttt model. |
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Additional Figure 10:
Observed significance in the $m_{ \tilde{\chi }^0_1} $ versus $m_{ \tilde{\mathrm {g}}} $ plane for the T5ttcc model. |
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Additional Figure 11:
Observed significance in the $m_{ \tilde{\chi }^\pm } $ versus $m_{ \tilde{\mathrm {b}}} $ plane for the T6ttWW model with $m_{ \tilde{\chi }^0_1} = $ 50 GeV. |
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Additional Figure 12:
Covariances of the background predictions in the 15 exclusive regions. |
| Additional Tables | |
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Additional Table 1:
Cut flow table for ${\mathrm{ t } {}\mathrm{ \bar{t} } } {\mathrm{ t } {}\mathrm{ \bar{t} } } $, at 35.9 fb$^{-1}$. The last two lines correspond to the most populated search regions The assumed cross section for this model is 9.103 pb. |
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Additional Table 2:
Cut flow table for the Ttttt model assuming gluino and LSP masses equal to 1400 and 1000 GeV, respectively, at 35.9 fb$^{-1}$. The last two lines correspond to the most populated search regions. The assumed cross section for this model is 0.0253 pb. |
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Additional Table 3:
Cut flow table for the Ttttt model assuming gluino and LSP masses equal to 1500 and 200 GeV, respectively, at 35.9 fb$^{-1}$. The last two lines correspond to the most populated search regions. The assumed cross section for this model is 0.0142 pb. |
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Additional Table 4:
Cut flow table for the T5qqqqWW model with $m_{ \tilde{\chi }^\pm _1} = 0.5(m_{ \tilde{g} } + m_{ \tilde{\chi }^0_1} )$ assuming gluino and LSP masses equal to 1000 and 700 GeV, respectively, at 35.9 fb$^{-1}$. The last two lines correspond to the most populated search regions. The assumed cross section for this model is 0.3254 pb. |
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Additional Table 5:
Cut flow table for the T5qqqqWW model with $m_{ \tilde{\chi }^\pm _1} = 0.5(m_{ \tilde{g} } + m_{ \tilde{\chi }^0_1} )$ assuming gluino and LSP masses equal to 1200 and 400 GeV, respectively, at 35.9 fb$^{-1}$. The last two lines correspond to the most populated search regions. The assumed cross section for this model is 0.0856 pb. |
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Additional Table 6:
Cut flow table for the T5qqqqWW model with $m_{ \tilde{\chi }^\pm _1 } = 0.5(m_{ \tilde{g} } + m_{ \tilde{\chi }^0_1 } )$ + 20 GeV assuming gluino and LSP masses equal to 1200 and 400 GeV, respectively, at 35.9 fb$^{-1}$. The last two lines correspond to the most populated search regions. The assumed cross section for this model is 0.0856 pb. |
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Additional Table 7:
Cut flow table for the T5qqqqWW model with $m_{ \tilde{\chi }^\pm _1 } = 0.5(m_{ \tilde{g} } + m_{ \tilde{\chi }^0_1 } )$ + 20 GeV assuming gluino and LSP masses equal to 1000 and 700 GeV, respectively, at 35.9 fb$^{-1}$. The last two lines correspond to the most populated search regions. The assumed cross section for this model is 0.3254 pb. |
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