Search for supersymmetry in pp collisions at √s = 8 TeV in events with three leptons and at least one b-tagged jet

Abstract

Results are reported from a search for new physics processes in events with three leptons and at least one b-tagged jet. The analysis is based on a sample of proton-proton collisions at a center-of-mass energy of 8 TeV with an integrated luminosity of $19.5~fb^{-1}$, collected by the CMS detector at the LHC. The event selection focuses on signatures for supersymmetry (SUSY) that include multiple W or Z bosons and b-jets in the final state, and the b-jet multiplicity is used to define low-background search regions. The standard model background contributions are determined using well-established techniques that are based on control samples in the data. The observed yields in the data are consistent with the background predictions, and the results are used to obtain upper limits on the production cross sections for several SUSY event topologies defined in the framework of simplified models.

Detailed documentation

The documentation can be found at SUS-13-008.

Tables and Plots from SUS-13-008

( click on plot to get .pdf )

Introduction

Figures Abbreviated Caption
Figure 1a: Processes targeted by this analysis include gluino-pair production with subsequent decay to four top quarks and two lightest SUSY particles (LSP) ($pp\rightarrow\tilde{g}\tilde{g}\rightarrow t\bar{t}t\bar{t}\chi^{0}_{1}\chi^{0}_{1}$) via off-shell top squark.
Figure 1b: Processes targeted by this analysis include gluino-pair production with subsequent decay to four top quarks and two lightest SUSY particles (LSP) ($pp\rightarrow\tilde{g}\tilde{g}\rightarrow t\bar{t}t\bar{t}\chi^{0}_{1}\chi^{0}_{1}$) via on-shell top squark.
Figure 2a: Processes targeted by this analysis include direct sbottom-pair production with decay to two top quarks, two W and two LSP ($pp\rightarrow\tilde{b}_1\tilde{b}_1^*\rightarrow t\bar{t}WW\chi^0_1\chi^0_1$).
Figure 2b: Processes targeted by this analysis include gluino-pair production with decay to two bottom quarks, two top quarks, two W bosons, and two LSP via on-shell bottom squark ($pp\rightarrow\tilde{g}\tilde{g}\rightarrow b\bar{b}t\bar{t}WW\chi^0_1\chi^0_1$).
Figure 3: Process targeted by this analysis includes direct sbottom-pair production with decay to two b-quarks, two Z and two LSP ($pp\rightarrow\tilde{b}_1\tilde{b}_1^*\rightarrow b\bar{b}ZZ\chi^0_1\chi^0_1$).

Event Selection and Backgrounds

Tables and Figures Abbreviated Caption
Figure 4: Distribution of events after the baseline event selection in data in the MET vs. HT plane for On-Z (left) and Off-Z (right) category. The requirement $E_{\rm{T}}^{\rm{miss}}>50~\rm{GeV}$ has not been applied to illustrate the background population at low MET.
Table 1: Binning defining the baseline selection and the search regions of the analysis. All the combinations of these requirements are used to create the 60 search regions (SR). For $N_{\rm{b-jets}}\ge3$ no extra jet multiplicity binning is added.
Figure 5: Jet multiplicity distributions for diboson events in WZ (left) and ZZ (right) control regions in data and simulated event samples.

Results

Tables and Figures Abbreviated Caption
TableOffZ.png Table 2: Predicted total background and observed data yields as a function of MET for events with no Z candidate present (Off-Z). Upper limits (68% CL) are quoted when there is not enough events in data and simulation to derive an expected number of background events.
TableOnZ.png Table 3: Predicted total background and observed data yields as a function of MET for events with a Z candidate present (On-Z). Upper limits (68% CL) are quoted when there is not enough events in data and simulation to derive an expected number of background events.
Figure 6a: Observed data events and predicted SM background as a function of number of jets, MET, HT, and number of b-jets are shown for events that do not contain an opposite-sign-same-flavour pair that is a Z boson candidate. The last bin in the histograms includes overflow events. The shaded bands correspond to the estimated uncertainties on the background which are calculated on the per bin basis.
Figure 6b: Observed data events and predicted SM background as a function of number of jets, MET, HT, and number of b-jets are shown for events that contain an opposite-sign-same-flavour pair that is a Z boson candidate. The last bin in the histograms includes overflow events. The shaded bands correspond to the estimated uncertainties on the background which are calculated on the per bin basis.
Figure 7: Predicted total background and observed data yields as a function of MET for events that do not contain an opposite-sign-same-flavour pair that is a Z boson candidate (Off-Z): (a) $H_{\rm{T}}<200~\rm{GeV}$ and (b) $H_{\rm{T}}>200~\rm{GeV}$. The shaded bands correspond to the estimated uncertainties on the background. The dashed histograms show an expected yield for the A1 model with particle masses $m_{\tilde{g}}=900~\rm{GeV}$ and $m_{\chi^{0}_{1}}=100~\rm{GeV}$. The dotted histograms show an expected yield for the B1 model with particle masses $m_{\tilde{b}_{1}}=500~\rm{GeV}$ and $m_{\tilde{\chi}^{\pm}}=200~\rm{GeV}$.
Figure 8: Predicted total background and observed data yields as a function of MET for events that contain an opposite-sign-same-flavour pair that is a Z boson candidate (On-Z): (a) $H_{\rm{T}}<200~\rm{GeV}$ and (b) $H_{\rm{T}}>200~\rm{GeV}$. The shaded bands correspond to the estimated uncertainties on the background. The dashed histograms show an expected yield for the A1 model with particle masses $m_{\tilde{g}}=900~\rm{GeV}$ and $m_{\chi^{0}_{1}}=100~\rm{GeV}$. The dotted histograms show an expected yield for the B1 model with particle masses $m_{\tilde{b}_{1}}=500~\rm{GeV}$ and $m_{\tilde{\chi}^{\pm}}=200~\rm{GeV}$.

Interpretation

Tables and Figures Abbreviated Caption
Table 4: Systematic uncertainties on the signal acceptance.

Figures Abbreviated Caption
Figure 9: The 95% CL upper limits on the (left) model A1 and (right) model A2 scenario cross sections (fb) derived using the CLs method. The solid (black) contours show the observed exclusions assuming the NLO+NLL cross sections, along with the one standard deviation theory uncertainties. The dashed (red) contours present the corresponding expected results, along with the one standard deviation experimental uncertainties.
Figure 10: The 95% CL upper limits on the model B2 scenario cross sections (fb) derived using the CLs method. In the model B2, it is assumed that $m_{\chi^{0}_{1}}=50~\rm{GeV}$ with (left) $m_{\chi^\pm}=150~\rm{GeV}$ or (right) $m_{\chi^\pm}=300~\rm{GeV}$. The solid (black) contours show the observed exclusions assuming the NLO+NLL cross sections, along with the one standard deviation theory uncertainties.The dashed (red) contours present the corresponding expected results, along with the one standard deviation experimental uncertainties.
  Figure 11a: The 95% CL upper limits on the model B1 scenario cross sections (fb) derived using the CLs method. The limits are computed for the following scenarios within the model B1: $m_{\chi^{0}_{1}}=50~\rm{GeV}$. The solid (black) contours show the observed exclusions assuming the NLO+NLL cross sections, along with the one standard deviation theory uncertainties. The dashed (red) contours present the corresponding expected results, along with the one standard deviation experimental uncertainties.
Figure 11bc: The 95% CL upper limits on the model B1 scenario cross sections (fb) derived using the CLs method. The limits are computed for the following scenarios within the model B1: (left) $m_{\chi^{0}_{1}}/m_{\chi^\pm} = 0.5$ or (right) $m_{\chi^{0}_{1}}/m_{\chi^\pm} = 0.8$. The solid (black) contours show the observed exclusions assuming the NLO+NLL cross sections, along with the one standard deviation theory uncertainties. The dashed (red) contours present the corresponding expected results, along with the one standard deviation experimental uncertainties. The deviation of the observed limit from the expected one is evaluated to be at the level of two standard deviations experimental uncertainties. The exclusion plots with additional information in them can be found at the link.
  Figure 12: The 95% CL upper limits on the model C1 scenario cross sections (fb) derived using the CLs method. The solid (black) contours show the observed exclusions assuming the NLO+NLL cross sections, along with the one standard deviation theory uncertainties. The dashed (red) contours present the corresponding expected results, along with the one standard deviation experimental uncertainties.

Electronic version of interpretations and acceptance maps

The root files contain the efficiencies for the signal regions used in the limits for the given model (as well as the total efficiency for the sum of these SR), the cross section limits, and the 6 exclusion contours.
Model Specification Link to the file LHE files
A1   T13lb.root (900, 100) GeV
A2 $\rm{m}_{\chi^{0}_{1}} = 50~\rm{GeV}$ T53lb.root  
B1 $\rm{m}_{\chi^{0}_{1}} = 50~\rm{GeV}$ T63lb.root (500, 200) GeV
B1 $\rm{m}_{\chi^{0}_{1}}/\rm{m}_{\chi^{\pm}_{1}}=0.5$ T6x053lb.root  
B1 $\rm{m}_{\chi^{0}_{1}}/\rm{m}_{\chi^{\pm}_{1}}=0.8$ T6x083lb.root  
B2 $\rm{m}_{\chi^{0}_{1}} = 50~\rm{GeV}$, $\rm{m}_{\chi^{\pm}_{1}} = 150~\rm{GeV}$ T71503lb.root  
B2 $\rm{m}_{\chi^{0}_{1}} = 50~\rm{GeV}$, $\rm{m}_{\chi^{\pm}_{1}} = 300~\rm{GeV}$ T73003lb.root  
C1 $\rm{m}_{\chi^{0}_{2}}-\rm{m}_{\chi^{0}_{1}}=110~\rm{GeV}$ T6bbZZ3lb.root  

Additional Material

Figures and Tables Abbreviated Caption
Performance in $t\bar{t}$ MC of the method for non-prompt leptons background estimation: muons. Red line in the ratio plots corresponds to a fit with a constant.
Performance in $t\bar{t}$ MC of the method for non-prompt leptons background estimation: electrons. Red line in the ratio plots corresponds to a fit with a constant.
The complete list of search regions (SR) used in the analysis. Signal regions 30-59 are the same as 0-29 except that the off-Z dilepton mass requirement is inverted.

Distributions in data

The kinematical distributions for the Off-Z data selected with $E_{T}^{miss} < 100~\rm{GeV}$ and $N_{\rm{b-tags}}\ge1$ requirements. The last bin in the histograms includes overflow events. The shaded bands correspond to the estimated uncertainties on the background which are calculated on the per bin basis.
The kinematical distributions for the data selected with $E_{T}^{miss} > 50~\rm{GeV}$ and $N_{\rm{b-tags}}\ge1$ requirements. The last bin in the histograms includes overflow events. The shaded bands correspond to the estimated uncertainties on the background which are calculated on the per bin basis.
The kinematical distributions for the data selected with $E_{T}^{miss} > 50~\rm{GeV}$ and $N_{\rm{b-tags}}\ge1$ requirements. The last bin in the histograms includes overflow events. The shaded bands correspond to the estimated uncertainties on the background which are calculated on the per bin basis.
The kinematical distributions for the On-Z data selected with $E_{T}^{miss} > 50~\rm{GeV}$ and $N_{\rm{b-tags}}\ge1$ requirements. The last bin in the histograms includes overflow events. The shaded bands correspond to the estimated uncertainties on the background which are calculated on the per bin basis.

Additional plots for the model B1 exclusion

Figures Abbreviated Caption
The 95% CL upper limits on the model B1 scenario cross sections (fb) derived using the CLs method. The limits are computed for the following scenario within the model B1: $m_{\chi^{0}_{1}}/m_{\chi^\pm} = 0.5$. The solid (black) contours show the observed exclusions assuming the NLO+NLL cross sections, along with the one standard deviation theory uncertainties. The dashed (red) contours present the corresponding expected results, along with (left) the two standard deviations or (right) one and two standard deviations experimental uncertainties.

The most sensitive search regions

Figures Abbreviated Caption
The most sensitive search regions for (left) model A1 and (right) model A2.
  The most sensitive search regions for the model B2. In the model B2, it is assumed that $m_{\chi^{0}_{1}}=50~\rm{GeV}$ with $m_{\chi^\pm}=150~\rm{GeV}$.
  The most sensitive search regions for the model B1: $m_{\chi^{0}_{1}}=50~\rm{GeV}$.
The most sensitive search regions for the model B1: (left) $m_{\chi^{0}_{1}}/m_{\chi^\pm} = 0.5$ or (right) $m_{\chi^{0}_{1}}/m_{\chi^\pm} = 0.8$.
  The most sensitive search regions for the model C1.

SR SR All SR Abbreviated Caption
Acceptance maps for two most sensitive search regions and for all used SR for model A1 (T1tttt).
Acceptance maps for two most sensitive search regions and for all used SR for model A2 (T5tttt).
Acceptance maps for two most sensitive search regions and for all used SR for model B2 (T7btW) with $m_{\chi^{\pm}} = 150~\rm{GeV}$.
Acceptance maps for two most sensitive search regions and for all used SR for model B2 (T7btW) with $m_{\chi^{\pm}} = 300~\rm{GeV}$.
Acceptance maps for two most sensitive search regions and for all used SR for model B1 (T6ttWW).
Acceptance maps for two most sensitive search regions and for all used SR for model B1 (T6ttWW).
Acceptance maps for two most sensitive search regions and for all used SR for model B1 (T6ttWW).
Acceptance maps for two most sensitive search regions and for all used SR for model C1 (T6bbZZ).

Cut Flow plots

Tables and Figures Abbreviated Caption
B-tagged jet multiplicity for 3l off-Z $E_{\rm{T}}^{\rm{miss}}>50~\rm{GeV}$ events. At the left for the gluino pair production (T1tttt model), at the right for sbottom pair production (T6ttWW model).
HT distribution for 3l off-Z $E_{\rm{T}}^{\rm{miss}}>50~\rm{GeV}$ events after applying a b-tagged jet multiplicity cut. At the left for the gluino pair production (T1tttt model) after asking for at least 2 b-jets, at the right for sbottom pair production (T6ttWW model) asking for at least 1 b-jet.
Jet multiplicity for 3l off-Z $E_{\rm{T}}^{\rm{miss}}>50~\rm{GeV}$ events with at least 2 b-tags (left, for T1tttt model) or 1 b-tag (right, for sbottom pair production - T6ttWW model).
MET distribution for 3l off-Z $H_{\rm{T}}>200~\rm{GeV}$ events with at least 4 jets in the event. At the left for the gluino pair production (T1tttt model) is shown with a requirement of at least 2 b-jets, at the right the sbottom pair production (T6ttWW model) with at least 1 b-jet.

Event displays

Event display of one event with 3 leptons and 3 b-tagged jets:

Topic attachments
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PDFpdf T6x053lbXSEC_2sigma.pdf r1 manage 20.3 K 2013-05-14 - 11:44 LesyaShchutska  
PNGpng T6x053lbXSEC_2sigma.png r1 manage 185.4 K 2013-05-14 - 11:45 LesyaShchutska  
Unknown file formatroot T6x083lb.root r4 r3 r2 r1 manage 33.7 K 2013-09-01 - 15:56 NikolozSkhirtladze  
PDFpdf T6x083lbXSEC.pdf r4 r3 r2 r1 manage 21.6 K 2013-05-14 - 11:44 LesyaShchutska  
PNGpng T6x083lbXSEC.png r4 r3 r2 r1 manage 196.9 K 2013-05-14 - 11:45 LesyaShchutska  
PDFpdf T7.pdf r5 r4 r3 r2 r1 manage 14.7 K 2013-05-14 - 13:20 LesyaShchutska  
PNGpng T7.png r4 r3 r2 r1 manage 23.9 K 2013-05-14 - 13:20 LesyaShchutska  
Unknown file formatroot T71503lb.root r4 r3 r2 r1 manage 21.1 K 2013-09-01 - 15:56 NikolozSkhirtladze  
PDFpdf T71503lbXSEC.pdf r4 r3 r2 r1 manage 21.1 K 2013-05-14 - 11:44 LesyaShchutska  
PNGpng T71503lbXSEC.png r4 r3 r2 r1 manage 181.9 K 2013-05-14 - 11:45 LesyaShchutska  
Unknown file formatroot T73003lb.root r4 r3 r2 r1 manage 16.9 K 2013-09-01 - 15:56 NikolozSkhirtladze  
PDFpdf T73003lbXSEC.pdf r4 r3 r2 r1 manage 20.8 K 2013-05-14 - 11:44 LesyaShchutska  
PNGpng T73003lbXSEC.png r4 r3 r2 r1 manage 189.1 K 2013-05-14 - 11:45 LesyaShchutska  
PDFpdf T7btW150AllSR.pdf r3 r2 r1 manage 14.6 K 2013-05-14 - 13:24 LesyaShchutska  
PNGpng T7btW150AllSR.png r3 r2 r1 manage 23.4 K 2013-05-14 - 13:24 LesyaShchutska  
PDFpdf T7btW300AllSR.pdf r3 r2 r1 manage 14.5 K 2013-05-14 - 13:24 LesyaShchutska  
PNGpng T7btW300AllSR.png r3 r2 r1 manage 22.7 K 2013-05-14 - 13:24 LesyaShchutska  
PDFpdf T7btW300SR18.pdf r3 r2 r1 manage 14.5 K 2013-05-14 - 13:30 LesyaShchutska  
PNGpng T7btW300SR18.png r3 r2 r1 manage 21.5 K 2013-05-14 - 13:30 LesyaShchutska  
PDFpdf T7btW300SR28.pdf r3 r2 r1 manage 14.5 K 2013-05-14 - 13:30 LesyaShchutska  
PNGpng T7btW300SR28.png r3 r2 r1 manage 21.1 K 2013-05-14 - 13:30 LesyaShchutska  
PDFpdf T7btWSR18.pdf r5 r4 r3 r2 r1 manage 14.8 K 2013-05-14 - 13:30 LesyaShchutska  
PNGpng T7btWSR18.png r5 r4 r3 r2 r1 manage 24.4 K 2013-05-14 - 13:30 LesyaShchutska  
PDFpdf T7btWSR28.pdf r5 r4 r3 r2 r1 manage 14.7 K 2013-05-14 - 13:30 LesyaShchutska  
PNGpng T7btWSR28.png r5 r4 r3 r2 r1 manage 23.6 K 2013-05-14 - 13:30 LesyaShchutska  
PDFpdf TableOffZ.pdf r1 manage 73.4 K 2013-05-04 - 18:58 LesyaShchutska  
PNGpng TableOffZ.png r2 r1 manage 337.2 K 2013-05-13 - 23:46 LesyaShchutska  
PDFpdf TableOnZ.pdf r1 manage 73.3 K 2013-05-04 - 18:58 LesyaShchutska  
PNGpng TableOnZ.png r2 r1 manage 332.6 K 2013-05-13 - 23:46 LesyaShchutska  
PDFpdf TableSystematics.pdf r1 manage 62.9 K 2013-05-14 - 11:56 LesyaShchutska  
PNGpng TableSystematics.png r1 manage 175.1 K 2013-05-14 - 11:56 LesyaShchutska  
PDFpdf allDistributions.pdf r1 manage 20.0 K 2013-05-08 - 19:16 LesyaShchutska  
PNGpng allDistributions.png r1 manage 35.3 K 2013-05-08 - 19:16 LesyaShchutska  
PDFpdf allMasses.pdf r1 manage 25.6 K 2013-05-08 - 19:16 LesyaShchutska  
PNGpng allMasses.png r1 manage 48.7 K 2013-05-08 - 19:16 LesyaShchutska  
PDFpdf nbtag_Sbottom.pdf r1 manage 14.2 K 2013-05-06 - 16:34 PieterEveraerts  
PNGpng nbtag_Sbottom.png r1 manage 11.4 K 2013-05-06 - 16:34 PieterEveraerts  
PDFpdf nbtag_T1tttt.pdf r1 manage 14.3 K 2013-05-06 - 16:34 PieterEveraerts  
PNGpng nbtag_T1tttt.png r1 manage 11.5 K 2013-05-06 - 16:34 PieterEveraerts  
PDFpdf njets_Sbottom.pdf r1 manage 14.7 K 2013-05-06 - 16:34 PieterEveraerts  
PNGpng njets_Sbottom.png r1 manage 13.9 K 2013-05-06 - 16:34 PieterEveraerts  
PDFpdf njets_T1tttt.pdf r1 manage 14.8 K 2013-05-06 - 16:34 PieterEveraerts  
PNGpng njets_T1tttt.png r1 manage 13.6 K 2013-05-06 - 16:34 PieterEveraerts  
PDFpdf njets_WZcontrol.pdf r1 manage 15.0 K 2013-05-04 - 20:05 LesyaShchutska  
PNGpng njets_WZcontrol.png r1 manage 101.7 K 2013-05-04 - 20:05 LesyaShchutska  
PDFpdf njets_ZZcontrol.pdf r1 manage 14.7 K 2013-05-04 - 20:04 LesyaShchutska  
PNGpng njets_ZZcontrol.png r1 manage 97.2 K 2013-05-04 - 20:04 LesyaShchutska  
PDFpdf offZ_distributions.pdf r1 manage 20.2 K 2013-05-04 - 19:07 LesyaShchutska  
PNGpng offZ_distributions.png r2 r1 manage 119.3 K 2013-05-04 - 19:58 LesyaShchutska  
PDFpdf offZ_highHT.pdf r3 r2 r1 manage 22.1 K 2013-05-29 - 00:21 LesyaShchutska  
PNGpng offZ_highHT.png r4 r3 r2 r1 manage 252.6 K 2013-05-29 - 00:21 LesyaShchutska  
PDFpdf offZ_lowHT.pdf r3 r2 r1 manage 22.4 K 2013-05-29 - 00:21 LesyaShchutska  
PNGpng offZ_lowHT.png r4 r3 r2 r1 manage 257.9 K 2013-05-29 - 00:21 LesyaShchutska  
PDFpdf offZdistributionsLowMET.pdf r1 manage 21.2 K 2013-05-08 - 19:16 LesyaShchutska  
PNGpng offZdistributionsLowMET.png r1 manage 36.4 K 2013-05-08 - 19:16 LesyaShchutska  
PDFpdf onZ_distributions.pdf r1 manage 20.3 K 2013-05-04 - 19:06 LesyaShchutska  
PNGpng onZ_distributions.png r2 r1 manage 122.8 K 2013-05-04 - 19:58 LesyaShchutska  
PDFpdf onZ_highHT.pdf r3 r2 r1 manage 23.4 K 2013-05-29 - 00:21 LesyaShchutska  
PNGpng onZ_highHT.png r4 r3 r2 r1 manage 266.6 K 2013-05-29 - 00:21 LesyaShchutska  
PDFpdf onZ_lowHT.pdf r3 r2 r1 manage 22.2 K 2013-05-29 - 00:21 LesyaShchutska  
PNGpng onZ_lowHT.png r4 r3 r2 r1 manage 249.0 K 2013-05-29 - 00:21 LesyaShchutska  
PDFpdf onZmasses.pdf r1 manage 19.8 K 2013-05-08 - 19:16 LesyaShchutska  
PNGpng onZmasses.png r1 manage 43.2 K 2013-05-08 - 19:16 LesyaShchutska  
PNGpng rhoZ.png r1 manage 133.6 K 2013-05-13 - 10:37 PieterEveraerts  
PNGpng rhophi.png r1 manage 187.3 K 2013-05-13 - 10:37 PieterEveraerts  
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Topic revision: r8 - 2014-07-30 - LesyaShchutska
 
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