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| CMS-SUS-16-003 ; CERN-EP-2016-306 | ||
| Search for new phenomena with multiple charged leptons in proton-proton collisions at $\sqrt{s}= $ 13 TeV | ||
| CMS Collaboration | ||
| 24 January 2017 | ||
| Eur. Phys. J. C 77 (2017) 635 | ||
| Abstract: Results are reported from a search for physics beyond the standard model in final states with at least three charged leptons, in any combination of electrons or muons. The data sample corresponds to an integrated luminosity of 2.3 fb$^{-1}$ of proton-proton collisions at $\sqrt{s} =$ 13 TeV, recorded by the CMS experiment at the LHC in 2015. Two jets are required in each event, providing good sensitivity to strong production of gluinos and squarks. The search regions, sensitive to a range of different new physics scenarios, are defined using the number of jets tagged as originating from bottom quarks, the sum of the magnitudes of the transverse momenta of the jets, the imbalance in the overall transverse momentum in the event, and the invariant mass of opposite-sign, same-flavor lepton pairs. The event yields observed in data are consistent with the expected background contributions from standard model processes. These results are used to derive limits in terms of $R$-parity conserving simplified models of supersymmetry that describe strong production of gluinos and squarks. Model-independent limits are presented to facilitate the reinterpretation of the results in a broad range of scenarios for physics beyond the standard model. | ||
| Links: e-print arXiv:1701.06940 [hep-ex] (PDF) ; CDS record ; inSPIRE record ; CADI line (restricted) ; | ||
| Figures & Tables | Summary | Additional Figures & Tables | References | CMS Publications |
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| Figures | |
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Figure 1:
Diagrams for gluino and bottom squark pair production leading to multilepton events for simplified models of supersymmetry: (left) T1tttt, (middle) T5qqqqWZ, and (right) T6ttWW. |
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Figure 1-a:
Diagram for gluino and bottom squark pair production leading to multilepton events for the T1tttt simplified model of supersymmetry. |
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Figure 1-b:
Diagram for gluino and bottom squark pair production leading to multilepton events for the T5qqqqWZ simplified model of supersymmetry. |
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Figure 1-c:
Diagram for gluino and bottom squark pair production leading to multilepton events for the T6ttWW simplified model of supersymmetry. |
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Figure 2:
Off-Z samples: from left to right, top to bottom, distributions of $ {H_{\mathrm {T}}} $, $ {{p_{\mathrm {T}}} ^\text {miss}} $, $ {N_\mathrm {j}} $, $ {N_{\mathrm{b}}} $, $ {p_{\mathrm {T}}} $ of leptons for the predicted backgrounds and for the data in the off-Z baseline selection region. In these plots the rightmost bin contains the overflow from counts outside the range of the plot. On the bottom-right corner the total predicted background and the number of events observed in the 15 off-Z SRs is shown. |
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Figure 2-a:
Distribution of $ {H_{\mathrm {T}}} $ for the predicted backgrounds and for the data in the off-Z baseline selection region. |
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Figure 2-b:
Distribution of $ { {p_{\mathrm {T}}} ^\text {miss}} $ for the predicted backgrounds and for the data in the off-Z baseline selection region. |
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Figure 2-c:
Distribution of $ {N_\mathrm {j}} $ for the predicted backgrounds and for the data in the off-Z baseline selection region. |
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Figure 2-d:
Distribution of $ {N_{\mathrm{ b } }} $ for the predicted backgrounds and for the data in the off-Z baseline selection region. |
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Figure 2-e:
Distribution of $ {p_{\mathrm {T}}} $ of the leading lepton for the predicted backgrounds and for the data in the off-Z baseline selection region. |
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Figure 2-f:
Distribution of $ {p_{\mathrm {T}}} $ of the subleading leading lepton for the predicted backgrounds and for the data in the off-Z baseline selection region. |
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Figure 2-g:
Distribution of $ {p_{\mathrm {T}}} $ of the trailing lepton for the predicted backgrounds and for the data in the off-Z baseline selection region. |
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Figure 2-h:
Total predicted background and the number of events observed in the 15 off-Z SRs. |
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Figure 3:
On-Z samples: from left to right, top to bottom, distributions of $ {H_{\mathrm {T}}} $, $ {{p_{\mathrm {T}}} ^\text {miss}} $, $ {N_\mathrm {j}} $, $ {N_{\mathrm{b}}} $, $ {p_{\mathrm {T}}} $ of leptons for the predicted backgrounds and for the data in the on-Z baseline selection region. In these plots the rightmost bin contains the overflow from counts outside the range of the plot. On the bottom-right corner the total predicted background and the number of events observed in the 15 on-Z SRs is shown. |
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Figure 3-a:
Distribution of $ {H_{\mathrm {T}}} $ for the predicted backgrounds and for the data in the on-Z baseline selection region. |
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Figure 3-b:
Distribution of $ { {p_{\mathrm {T}}} ^\text {miss}} $ for the predicted backgrounds and for the data in the on-Z baseline selection region. |
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Figure 3-c:
Distribution of $ {N_\mathrm {j}} $ for the predicted backgrounds and for the data in the on-Z baseline selection region. |
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Figure 3-d:
Distribution of $ {N_{\mathrm{ b } }} $ for the predicted backgrounds and for the data in the on-Z baseline selection region. |
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Figure 3-e:
Distribution of $ {p_{\mathrm {T}}} $ of the leading lepton for the predicted backgrounds and for the data in the on-Z baseline selection region. |
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Figure 3-f:
Distribution of $ {p_{\mathrm {T}}} $ of the subleading lepton for the predicted backgrounds and for the data in the on-Z baseline selection region. |
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Figure 3-g:
Distribution of $ {p_{\mathrm {T}}} $ of the trailing lepton for the predicted backgrounds and for the data in the on-Z baseline selection region. |
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Figure 3-h:
Total predicted background and the number of events observed in the 15 on-Z SRs. |
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Figure 4:
Exclusion contours as a function of $m_{\tilde{ \mathrm{g} }}$ or $m_{\tilde{ \mathrm{ b } } }$, and $m_{\tilde{\chi}^{0}_{1} }$ or $m_{\tilde{\chi}^{\pm}_{1} }$, for the simplified SUSY models (top-left) T1tttt, (top-right) T6ttWW, and (bottom) T5qqqqWZ. The color scale indicates the 95% CL observed upper limits on the cross section. The observed (expected) exclusion curves are indicated by the solid (dashed) lines using NLO+NLL production cross sections, along with the corresponding $\pm $1 s.d. theoretical (experimental) uncertainties. |
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Figure 4-a:
Exclusion contours as a function of $m_{\tilde{ \mathrm{g} }}$ and $m_{\tilde{\chi}^{0}_{1} }$, for the T1tttt simplified SUSY model. The color scale indicates the 95% CL observed upper limits on the cross section. The observed (expected) exclusion curves are indicated by the solid (dashed) lines using NLO+NLL production cross sections, along with the corresponding $\pm $1 s.d. theoretical (experimental) uncertainties. |
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Figure 4-b:
Exclusion contours as a function of $m_{\tilde{ \mathrm{ b } } }$ and $m_{\tilde{\chi}^{\pm}_{1} }$, for the T6ttWW simplified SUSY model. The color scale indicates the 95% CL observed upper limits on the cross section. The observed (expected) exclusion curves are indicated by the solid (dashed) lines using NLO+NLL production cross sections, along with the corresponding $\pm $1 s.d. theoretical (experimental) uncertainties. |
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Figure 4-c:
Exclusion contours as a function of $m_{\tilde{ \mathrm{g} }}$ and $m_{\tilde{\chi}^{0}_{1} }$, for the T5qqqqWZ simplified SUSY model. The color scale indicates the 95% CL observed upper limits on the cross section. The observed (expected) exclusion curves are indicated by the solid (dashed) lines using NLO+NLL production cross sections, along with the corresponding $\pm $1 s.d. theoretical (experimental) uncertainties. |
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Figure 5:
Limits on the product of cross section, detector acceptance, and selection efficiency, $\sigma A \epsilon $, for the production of multilepton events with (left) or without (right) an on-Z lepton pair as a function of the $ {{p_{\mathrm {T}}} ^\text {miss}} $ threshold. |
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Figure 5-a:
Limits on the product of cross section, detector acceptance, and selection efficiency, $\sigma A \epsilon $, for the production of multilepton events with an on-Z lepton pair as a function of the $ {{p_{\mathrm {T}}} ^\text {miss}} $ threshold. |
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Figure 5-b:
Limits on the product of cross section, detector acceptance, and selection efficiency, $\sigma A \epsilon $, for the production of multilepton events without an on-Z lepton pair as a function of the $ {{p_{\mathrm {T}}} ^\text {miss}} $ threshold. |
| Tables | |
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Table 1:
Definition of multilepton signal regions. These regions are the same for the on-Z and off-Z regions. |
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Table 2:
Summary of the sources of uncertainties and their magnitudes. The third column provides the changes in yields of signal and background induced by one s.d. changes in the magnitude of uncertainties. |
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Table 3:
Off-Z SRs: Comparison of observed event yields in data with predicted background yields. |
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Table 4:
On-Z SRs: Comparison of observed event yields in data with predicted background yields. |
| Summary |
|
We have presented the search for beyond-the-standard-model physics in final states with at least 3 leptons, electrons or muons, using proton-proton data collected with the CMS detector at $\sqrt{s} = $ 13 TeV, corresponding to an integrated luminosity of 2.3 fb$^{-1}$. The analysis makes use of techniques based on control samples in data to estimate reducible backgrounds and to validate the simulation for use in estimating irreducible backgrounds. To maximize sensitivity to a broad range of possible signal models, we investigate 30 exclusive signal regions. The event yields observed in data are in agreement with the standard model background predictions. This search is designed to be sensitive to multiple BSM models. As an example, we interpret the result in the context of a gluino-pair production model that features cascade decays producing four top quarks in the final state. In this simplified model, we exclude gluinos with a mass of up to 1175 GeV in the case of a massless lightest supersymmteric particle (LSP). For gluino masses up to approximately 1150 GeV, neutralino masses below 650 GeV are excluded. These are the first CMS results reported in this final state at $\sqrt{s} = $ 13 TeV. In a bottom squark pair production model with cascade decays that contain two top quarks and two additional $\mathrm{W^{\pm}}$ bosons, we also set limits on the masses of the bottom squark and the chargino. We exclude bottom squarks with a mass of up to 450 GeV in the case of a chargino with a mass of 200 GeV. For bottom squark masses up to approximately 450 GeV, neutralino masses below 300 GeV are excluded. In a similar search at $\sqrt{s} = $ 8 TeV [42], the bottom squark mass limit was slightly larger and the chargino mass limit was approximately the same. An additional interpretation is presented in a gluino pair production model with four light quarks and two vector bosons in the final state. For the case of one W and one Z boson in the final state, we exclude gluino masses up to 825 GeV when the LSP mass is 100 GeV, and LSP masses up to 500 GeV for 700 GeV gluinos. Finally, limits on the number of multilepton events with ${H_{\mathrm{T}}} > $ 400 GeV as a function of $ {p_{\mathrm{T}}^{\text{miss}}}$ threshold are also presented in terms of the product of cross section, detector acceptance, and selection efficiency. For a $ {p_{\mathrm{T}}^{\text{miss}}}$ threshold greater than 500 GeV, the observed and expected limits are 1.3 fb. |
| Additional Figures | |
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Additional Figure 1:
The signal region at each grid point of the T1tttt scan with the lowest observed cross section limit. |
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Additional Figure 2:
The signal region at each grid point of the T6ttWW scan with the lowest observed cross section limit. |
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Additional Figure 3:
The signal region at each grid point of the T5qqqqWZ scan with the lowest observed cross section limit. |
| Additional Tables | |
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Additional Table 1:
Evolution of the yields of selected SUSY benchmark models targeted by the analysis with the cut flow of the off-Z baseline selection. The yields are normalized to an integrated luminosity of $ {\mathcal {L}} = $ 2.3 fb$^{-1}$ |
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Additional Table 2:
Evolution of the yields of selected mass points of the T1tttt SUSY benchmark model with the cut flow of the off-Z baseline selection. The yields are normalized to an integrated luminosity of $ {\mathcal {L}} = $ 2.3 fb$^{-1}$. |
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Additional Table 3:
Evolution of the yields of selected mass points of the T6ttWW SUSY benchmark model with the cut flow of the off-Z baseline selection. The $ \tilde{\chi}^0_1 $ mass is fixed to 50 GeV. The yields are normalized to an integrated luminosity of $ {\mathcal {L}} = $ 2.3 fb$^{-1}$. |
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Additional Table 4:
Evolution of the yields of selected mass points of the T5qqqqWZ SUSY benchmark model with the cut flow of the on-Z baseline selection. The chargino mass is fixed to $m_{\tilde{\chi}^{\pm}} = 0.5 (m_{\tilde{g}} - m_{\tilde{\chi}^0_1})$. The yields are normalized to an integrated luminosity of $ {\mathcal {L}} = $ 2.3 fb$^{-1}$. |
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Additional Table 5:
The total expected yields in the off-Z search regions with the 2.3 fb$^{-1}$ of data and signal yields of the T6ttWW model for several mass points. The mass points are characterized by the mass of the $ \tilde{b} $ and of the $\tilde{\chi}^{\pm} $ in units of GeV. The mass of the $ \tilde{\chi}^0_1 $ is fixed to $m_{\tilde{\chi}^0_1} = $ 50 GeV. |
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Compact Muon Solenoid LHC, CERN |
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