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| CMS-PAS-SUS-19-008 | ||
| Search for physics beyond the standard model in events with two same-sign leptons or at least three leptons and jets in proton-proton collisions at $\sqrt{s}= $ 13 TeV. | ||
| CMS Collaboration | ||
| March 2019 | ||
| Abstract: A data sample of events from proton-proton collisions with two isolated same-sign leptons or at least three leptons, and at least two jets, is studied in a search for signatures of new physics phenomena by the CMS Collaboration at the LHC. The data correspond to an integrated luminosity of 137 fb$^{-1}$, at a center-of-mass energy of 13 TeV. The properties of the events are consistent with expectations from standard model processes, and no excess yield is observed. Exclusion limits at 95% confidence level are set on cross sections for the pair production of gluinos or squarks for various decay scenarios in the context of supersymmetry models conserving or violating R-parity. The observed lower mass limits are as high as 2.1 TeV for gluinos, and 0.9 TeV for top and bottom squarks. | ||
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Links:
CDS record (PDF) ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, EPJC 80 (2020) 752. The superseded preliminary plots can be found here. |
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| Figures | |
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Figure 1:
Diagrams illustrating the simplified RPC SUSY models considered in this analysis. |
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Figure 2:
Diagrams illustrating the two RPV SUSY models considered in this analysis. |
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Figure 2-a:
Diagram illustrating one of the RPV SUSY models considered in this analysis. |
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Figure 2-b:
Diagram illustrating one of the RPV SUSY models considered in this analysis. |
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Figure 3:
Distributions of the main analysis variables after the baseline selection in all signal categories: ${H_{\mathrm {T}}}$, ${{p_{\mathrm {T}}} ^\text {miss}}$, ${m_\mathrm {T}^{\text {min}}}$, ${N_\text {jets}}$, ${N_{\mathrm{b}}}$, and the charge of the same sign pair, where the last bin includes the overflow. The hatched area represents the total uncertainty in the background prediction. The lower panels show the ratio of the observed event yield and the background prediction. |
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Figure 3-a:
Distribution of ${H_{\mathrm {T}}}$ after the baseline selection in all signal categories. The last bin includes the overflow. The hatched area represents the total uncertainty in the background prediction. The lower panel shows the ratio of the observed event yield and the background prediction. |
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Figure 3-b:
Distribution of ${{p_{\mathrm {T}}} ^\text {miss}}$ after the baseline selection in all signal categories. The last bin includes the overflow. The hatched area represents the total uncertainty in the background prediction. The lower panel shows the ratio of the observed event yield and the background prediction. |
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Figure 3-c:
Distribution of ${m_\mathrm {T}^{\text {min}}}$ after the baseline selection in all signal categories. The last bin includes the overflow. The hatched area represents the total uncertainty in the background prediction. The lower panel shows the ratio of the observed event yield and the background prediction. |
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Figure 3-d:
Distribution of ${N_\text {jets}}$ after the baseline selection in all signal categories. The last bin includes the overflow. The hatched area represents the total uncertainty in the background prediction. The lower panel shows the ratio of the observed event yield and the background prediction. |
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Figure 3-e:
Distribution of ${N_{\mathrm{b}}}$ after the baseline selection in all signal categories. The last bin includes the overflow. The hatched area represents the total uncertainty in the background prediction. The lower panel shows the ratio of the observed event yield and the background prediction. |
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Figure 3-f:
Distribution of the charge of the same sign pair, after the baseline selection in all signal categories. The last bin includes the overflow. The hatched area represents the total uncertainty in the background prediction. The lower panel shows the ratio of the observed event yield and the background prediction. |
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Figure 4:
Expected and observed SR yields for the SSHH, SSHL, SSLL signal categories. |
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Figure 4-a:
Expected and observed SR yields for the SSHH signal category. |
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Figure 4-b:
Expected and observed SR yields for the SSHL signal category. |
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Figure 4-c:
Expected and observed SR yields for the SSLL signal category. |
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Figure 5:
Expected and observed SR yields for the ML and LM signal categories. |
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Figure 5-a:
Expected and observed SR yields for the ML signal category. |
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Figure 5-b:
Expected and observed SR yields for the LM signal category. |
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Figure 6:
Exclusion regions at 95% CL in the $m_{\tilde{\chi}^0_1}$ versus $m_{{\mathrm{\tilde{g}}}}$ plane for the T1tttt model (left), with off-shell third-generation squarks, and the T5tttt (right) model, with on-shell third-generation squarks. For the T5tttt model, $m_{\tilde{\mathrm{t}}} - m_{\tilde{\chi}^0_1} = m_{\mathrm{t}}$. 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 [42,43,44,45,46,47] (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-a:
Exclusion regions at 95% CL in the $m_{\tilde{\chi}^0_1}$ versus $m_{{\mathrm{\tilde{g}}}}$ plane for the T1tttt model, with off-shell third-generation squarks. 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 [42,43,44,45,46,47] (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-b:
Exclusion regions at 95% CL in the $m_{\tilde{\chi}^0_1}$ versus $m_{{\mathrm{\tilde{g}}}}$ plane for the T5tttt model, with on-shell third-generation squarks. For this model, $m_{\tilde{\mathrm{t}}} - m_{\tilde{\chi}^0_1} = m_{\mathrm{t}}$. 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 [42,43,44,45,46,47] (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 7:
Exclusion regions at 95% CL in the plane of $m_{\tilde{\chi}^0_1}$ versus $m_{{\mathrm{\tilde{g}}}}$ for the T5qqqqWZ model with $m_{\tilde{\chi}^{\pm}_1}=0.5(m_{{\mathrm{\tilde{g}}}} + m_{\tilde{\chi}^0_1})$ (a) and with $m_{\tilde{\chi}^{\pm}_1} = m_{\tilde{\chi}^0_1}$ + 20 GeV (b). The notations are as in Fig. 6. |
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Figure 7-a:
Exclusion regions at 95% CL in the plane of $m_{\tilde{\chi}^0_1}$ versus $m_{{\mathrm{\tilde{g}}}}$ for the T5qqqqWZ model with $m_{\tilde{\chi}^{\pm}_1}=0.5(m_{{\mathrm{\tilde{g}}}} + m_{\tilde{\chi}^0_1})$. The notations are as in Fig. 6. |
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Figure 7-b:
Exclusion regions at 95% CL in the plane of $m_{\tilde{\chi}^0_1}$ versus $m_{{\mathrm{\tilde{g}}}}$ for the T5qqqqWZ model with $m_{\tilde{\chi}^{\pm}_1} = m_{\tilde{\chi}^0_1}$ + 20 GeV. The notations are as in Fig. 6. |
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Figure 8:
Exclusion regions at 95% CL in the plane of $m_{\tilde{\chi}^0_1}$ versus $m_{{\mathrm{\tilde{g}}}}$ for the T5qqqqWW model with $m_{\tilde{\chi}^{\pm}_1}=0.5(m_{{\mathrm{\tilde{g}}}} + m_{\tilde{\chi}^0_1})$ (a) and with $m_{\tilde{\chi}^{\pm}_1} = m_{\tilde{\chi}^0_1}$ + 20 GeV (b). The notations are as in Fig. 6. |
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Figure 8-a:
Exclusion regions at 95% CL in the plane of $m_{\tilde{\chi}^0_1}$ versus $m_{{\mathrm{\tilde{g}}}}$ for the T5qqqqWW model with $m_{\tilde{\chi}^{\pm}_1}=0.5(m_{{\mathrm{\tilde{g}}}} + m_{\tilde{\chi}^0_1})$. The notations are as in Fig. 6. |
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Figure 8-b:
Exclusion regions at 95% CL in the plane of $m_{\tilde{\chi}^0_1}$ versus $m_{{\mathrm{\tilde{g}}}}$ for the T5qqqqWW model with $m_{\tilde{\chi}^{\pm}_1} = m_{\tilde{\chi}^0_1}$ + 20 GeV. The notations are as in Fig. 6. |
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Figure 9:
Exclusion regions at 95% CL in the plane of $m_{\tilde{\chi}^{\pm}_1}$ versus $m_{\tilde{\mathrm{b}}}$ for the T6ttWW model with $m_{\tilde{\chi}^0_1} = $ 50 GeV. The notations are as in Fig. 6. |
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Figure 10:
Exclusion regions at the 95% CL in the plane of $m(\tilde{\mathrm{t}} _{1})$ versus $m(\tilde{\mathrm{t}} _{2})$ for the T6ttHZ simplified model with $m(\tilde{\mathrm{t}} _{2})-m(\tilde{\chi}^0_1) = $ 175 GeV. The three exclusions represent BR($\tilde{\mathrm{t}} _{2}\rightarrow \tilde{\mathrm{t}} _{1}\mathrm {Z})$ of 0%, 50%, and 100%, respectively. The right-hand side color scale indicates the excluded cross section values for a given point in the SUSY particle mass plane. Observed and expected limit curves indicate the boundaries of the excluded regions (to the left and below the curve). |
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Figure 10-a:
Exclusion regions at the 95% CL in the plane of $m(\tilde{\mathrm{t}} _{1})$ versus $m(\tilde{\mathrm{t}} _{2})$ for the T6ttHZ simplified model with $m(\tilde{\mathrm{t}} _{2})-m(\tilde{\chi}^0_1) = $ 175 GeV and BR($\tilde{\mathrm{t}} _{2}\rightarrow \tilde{\mathrm{t}} _{1}\mathrm {Z})$ of 0%. The right-hand side color scale indicates the excluded cross section values for a given point in the SUSY particle mass plane. Observed and expected limit curves indicate the boundaries of the excluded regions (to the left and below the curve). |
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Figure 10-b:
Exclusion regions at the 95% CL in the plane of $m(\tilde{\mathrm{t}} _{1})$ versus $m(\tilde{\mathrm{t}} _{2})$ for the T6ttHZ simplified model with $m(\tilde{\mathrm{t}} _{2})-m(\tilde{\chi}^0_1) = $ 175 GeV and BR($\tilde{\mathrm{t}} _{2}\rightarrow \tilde{\mathrm{t}} _{1}\mathrm {Z})$ of 50%. The right-hand side color scale indicates the excluded cross section values for a given point in the SUSY particle mass plane. Observed and expected limit curves indicate the boundaries of the excluded regions (to the left and below the curve). |
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Figure 10-c:
Exclusion regions at the 95% CL in the plane of $m(\tilde{\mathrm{t}} _{1})$ versus $m(\tilde{\mathrm{t}} _{2})$ for the T6ttHZ simplified model with $m(\tilde{\mathrm{t}} _{2})-m(\tilde{\chi}^0_1) = $ 175 GeV and BR($\tilde{\mathrm{t}} _{2}\rightarrow \tilde{\mathrm{t}} _{1}\mathrm {Z})$ of 100%. The right-hand side color scale indicates the excluded cross section values for a given point in the SUSY particle mass plane. Observed and expected limit curves indicate the boundaries of the excluded regions (to the left and below the curve). |
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Figure 11:
Limits on RPV gluino pair production with each gluino decaying into four quarks and one lepton (T1qqqqL, left) and each gluino decaying into a top, bottom, and strange quark (T1tbs, right) |
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Figure 11-a:
Limits on RPV gluino pair production with each gluino decaying into four quarks and one lepton (T1qqqqL). |
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Figure 11-b:
Limits on RPV gluino pair production with each gluino decaying into a top, bottom, and strange quark (T1tbs). |
| Tables | |
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Table 1:
$ {p_{\mathrm {T}}} $ and $\eta $ requirements for leptons and jets. Note that the $ {p_{\mathrm {T}}} $ thresholds to count jets and b-tagged jets are different. |
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Table 2:
SR definitions for the SSHH category. Charge split cells are indicated with ($++$) and ($--$). In order to avoid overlaps, an upper bound $ {{p_{\mathrm {T}}} ^\text {miss}} < $ 300 GeV is used for regions with $ {H_{\mathrm {T}}} > $ 300 GeV. There are 62 regions in total. |
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Table 3:
SR definitions for the SSHL category. In order to avoid overlaps, an upper bound $ {{p_{\mathrm {T}}} ^\text {miss}} < $ 300 GeV is used for regions with $ {H_{\mathrm {T}}} > $ 300 GeV. There are 43 regions in total. |
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Table 4:
SR definitions for the SSLL category. All SRs in this category require $ {N_\text {jets}} \geq $ 2. There are 8 regions in total. |
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Table 5:
SR definitions for the LM category. All SRs in this category require $ {N_\text {jets}} \geq $ 2, $ {{p_{\mathrm {T}}} ^\text {miss}} < $ 50 GeV, $ {H_{\mathrm {T}}} > $ 300 GeV, and HH lepton momenta. The 2 high $ {H_{\mathrm {T}}} $ regions are split only by $ {N_\text {jets}} $, giving 11 regions in total. |
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Table 6:
SR definitions for the ML category. All SRs in these categories require $ {N_\text {jets}} \geq $ 2. Regions marked with ${}^\dagger $ are split by $ {m_\mathrm {T}^{\text {min}}} = $ 120 GeV, with the high $ {m_\mathrm {T}^{\text {min}}} $ region specified by the second label. On-Z regions events include an OS same flavor lepton pair with 76 $ < m_{\ell \ell} < $ 106 GeV. There are 44 regions in total. |
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Table 7:
Summary of the sources of uncertainty and their effect on the yields of different processes in the SRs. 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 8:
Expected background and observed event yields in the search regions used in this search. |
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Table 9:
Event yields in HH regions. Yields shown as "-'' have a contribution smaller than 0.01, or do not contribute to a particular region. |
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Table 10:
Event yields in HL regions. Yields shown as "-'' have a contribution smaller than 0.01, or do not contribute to a particular region. |
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Table 11:
Event yields in LL regions. Yields shown as "-'' have a contribution smaller than 0.01, or do not contribute to a particular region. |
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Table 12:
Event yields in ML regions. Yields shown as "-'' have a contribution smaller than 0.01, or do not contribute to a particular region. |
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Table 13:
Event yields in LM regions. Yields shown as "-'' have a contribution smaller than 0.01, or do not contribute to a particular region. |
| Summary |
| A sample of same-sign dilepton or trilepton events produced in association with several jets in proton-proton collisions at 13 TeV, corresponding to an integrated luminosity of 137 fb$^{-1}$, has been studied to search for manifestations of physics beyond the standard model. The data are found to be consistent with the standard model expectations, and no excess event yield is observed. The results are interpreted as limits at 95% confidence level on cross sections for the production of new particles in simplified supersymmetric models, considering both RPC and RPV scenarios. Using calculations for these cross sections as functions of particle masses, the limits are turned into lower mass limits that are as high as 2.1 TeV for gluinos and 0.9 TeV for top and bottom squarks, depending on the details of the model. |
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