A Search for Scalar Top Quark Production and Decay to All Hadronic Final States in pp Collisions at √s = 8 TeV

Abstract

A search for scalar top quarks in final states with jets and missing transverse momentum is presented. The data sample of proton–proton collisions used corresponds to an integrated luminosity of 18.9 fb−1 collected at √s = 8 TeV with the CMS detector at the LHC. The search features novel background suppression and prediction methods, including a dedicated top-quark pair reconstruction algorithm. The data are found to be in agreement with the predicted backgrounds. Exclusion limits are set in simplified SUSY models with the top squark decaying to jets and an undetected neutralino, either through an on-shell top quark or through an intermediate chargino. Models with the top squark decaying via an on-shell top quark are excluded for top squark masses up to 755 GeV in the case of neutralino masses below 200 GeV. Models with an intermediate chargino are excluded in some scenarios for top squark masses up to 650 GeV.

Plots in paper

Overview of the analysis

Figure Formats Caption
T2tt: pdf, png
T2bW: pdf, png
Figure 1: Diagrams representing the two simplified models of direct top squark pair production considered in this study: T2tt with top squark decay via an on-shell top quark (left) and T2bW with top squark decay via an intermediate chargino (right).
  pdf, png Table 1: Predicted and observed data yields after the T2bW and T2tt baseline selections. The yield of the T2bW model point with MStop = 600, MLSP = 0, and x = 0.75 is shown after the T2bW baseline selection. The yield of the T2tt model point with MStop = 600 and MLSP = 0 is shown after the T2tt baseline selection. The uncertainties on the background predictions and signal yields are the statistical uncertainties.

Lepton identification

Figure Formats Caption
Efficiency: pdf, png
mT: pdf, png
Figure 2: Left: The efficiency to select non-prompt versus the efficiency to select prompt candidates. The curves are produced by varying BDT discriminator values for electrons, muons, and taus. Prompt leptons are those matched to lepton candidates in semi-leptonic events, whereas non-prompt leptons are those that are matched to lepton candidates in fully hadronic in the case of electrons and muons, or fully hadronic T2tt signal events in the case of taus. Right: mT of and the momentum of the visible tau decay products, for tau candidates matched to tau decays in semi-leptonic events, and all tau candidates in a fully hadronic T2tt signal (MStop = 620, MLSP = 40).

Top reconstruction

Figure Formats Caption
angular separation: pdf, png
jet separation: pdf, png
Figure 3: The distributions of properties of reconstructed top pairs are shown for data together with signal and background MC simulated data samples for three choices of MStop and MLSP after the baseline selection. The left plot shows the minimum angular separation between any two jets in the leading reconstructed top, defined as the top candidate of the pair with the highest discriminator value, while the right plot shows the minimum separation in φ between each jet and in the sub-leading reconstructed top.

Search regions

Figure Formats Caption
  pdf, png Table 2: Search regions for the T2bW and T2tt scenarios. The table lists the mass models used for the training of the BDTs, the cut on the BDT output, and the efficiency of that mass model to pass the BDT selection relative to the baseline selection. The statistics of the T2bW discriminator training samples is increased by using four similar mass models. They are the four combinations of the two and two masses listed. The efficiency of the mass model with the larger mass and smaller mass is listed.

Background estimation

Figure Formats Caption
T2bW_LX: pdf, png
T2bW_LM: pdf, png
Figure 4: Comparisons of BDT discriminator outputs for data and corrected MC for and W+jets single-lepton control samples, with leptons removed. Results are plotted as a function of the MVA discriminator output for the five T2bW validation regions. ``Data'' is the ratio of event yields in data to event yields in MC. The MC events have been reweighted. The last three bins along the abscissa in each plot contain the ratios for the two extended validation regions and the validation region itself. The histogram labelled ``MC without corr." plots the ratio whose numerator is the total MC event count before corrections and whose denominator is the event count for the corrected MC as used for the ``Data" histogram. The other histograms provide the relative contributions of the various background processes.
T2bW_MXHM: pdf, png
T2bW_HXHM: pdf, png
 
  T2bW_VHM: pdf, png  
T2tt_LM: pdf, png
T2tt_MM: pdf, png
Figure 5: Comparisons of BDT discriminator outputs for data and corrected MC for and W+jets single-lepton control samples, with leptons removed, for the four T2tt validation regions. All quantities are defined as in Fig. 4.
T2tt_HM: pdf, png
T2tt_VHM: pdf, png
 
T2bW_LX: pdf, png
T2bW_LM: pdf, png
Figure 6: Comparisons of BDT discriminator outputs for data and corrected MC for the Z+jets dilepton control samples, with leptons removed, for the five T2bW validation regions. All quantities are defined as in Fig. 4.
T2bW_MXHM: pdf, png
T2bW_HXHM: pdf, png
 
  T2bW_VHM: pdf, png  
T2tt_LM: pdf, png
T2tt_MM: pdf, png
Figure 7: Comparisons of BDT discriminator outputs for data and corrected MC for the Z+jets dilepton control samples, with leptons removed, for the four T2tt validation regions. All quantities are defined as in Fig. 4.
T2tt_HM: pdf, png
T2tt_VHM: pdf, png
 

Results

Figure Formats Caption
T2bW_LX: pdf, png
T2bW_LM: pdf, png
Figure 8: Observed and predicted event yields for each T2bW search region discriminator. The bottom pane of each figure shows the ratio of observed to predicted yields where the error bars on data points only include the statistical uncertainties for the data and MC simulated data event yields. The transparent violet bands represent the relative systematic uncertainties on the predictions.
T2bW_MXHM: pdf, png
T2bW_HXHM: pdf, png
 
  T2bW_VHM: pdf, png  
T2tt_LM: pdf, png
T2tt_MM: pdf, png
Figure 9: Observed and predicted event yields for each T2tt search region discriminator. The bottom pane of each figure shows the ratio of observed to predicted yields where the error bars on data points only include the statistical uncertainties for the data and MC simulated data event yields. The transparent violet bands represent the relative systematic uncertainties on the predictions.
T2tt_HM: pdf, png
T2tt_VHM: pdf, png
 
T2bW_LX: pdf, png
T2bW_LM: pdf, png
Figure 10: Observed and predicted event yields for each T2bW search region discriminator before lepton vetoes are applied. The bottom pane of each figure shows the ratio of observed to predicted yields where the error bars on data points only include the statistical uncertainties for the data and MC simulated data event yields. The transparent violet bands represent the relative systematic uncertainties on the predictions. The blue error band is the relative systematic error on the prediction yield.
T2bW_MXHM: pdf, png
T2bW_HXHM: pdf, png
 
  T2bW_VHM: pdf, png  
T2tt_LM: pdf, png
T2tt_MM: pdf, png
Figure 11: Observed and predicted event yields for each T2tt search region discriminator before lepton vetoes are applied. The bottom pane of each figure shows the ratio of observed to predicted yields where the error bars on data points only include the statistical uncertainties for the data and MC simulated data event yields. The transparent violet bands represent the relative systematic uncertainties on the predictions.
T2tt_HM: pdf, png
T2tt_VHM: pdf, png
 
  pdf, png Table 3: Estimated contributions of SM background processes in several -triggered search regions. The , W+jets, Z+jets and QCD multijet backgrounds are estimated using MC simulated data samples that have been weighted by scale factors obtained from data-MC simulated data comparisons as discussed in the text. The single top and backgrounds are estimated directly from MC simulated data samples, with uncertainties assigned for sources of MC mismodeling.
  pdf, png Table 4: Predicted and observed data yields in the T2bW and T2tt search regions. The uncertainties on the background predictions are the combined systematic and statistical uncertainties.

Interpretation

Figure Formats Caption
  pdf, png Table 5: Summary of the systematic uncertainties in the signal selection efficiencies. The uncertainties can depend on signal topology, mass values, and search region. The quoted value ranges capture the extents of the variations associated with these dependencies. In all cases, the upper bound corresponds to the region in which m is close to m.
T2tt: pdf, png
0.25 T2bW: pdf, png
Figure 12: Search regions providing the most stringent limits in the m-m plane in T2tt (top left) and T2bW signal topologies (for mass splitting parameter values x = 0.25, 0.50, 0.75). For T2tt, T2tt_LM, T2tt_MM, T2tt_HM and T2tt_VHM search regions are number 1, 2, 3 and 4, respectively. In T2bW the T2bW_LX, T2bW_LM, T2bW_MXHM, T2bW_VHM, and T2bW_HXHM search regions are numbered 1, 2, 3, 4 and 5 respectively. In regions with m similar to m, the different search regions can have similar sensitivity which leads to the fluctuations seen among neighboring bins.
0.50 T2bW: pdf, png
0.75 T2bW: pdf, png
 
T2tt: pdf, png,root
0.25 T2bW: pdf, png,root
Figure 13: Observed and expected 95% CL limit on the top squark pair production cross section and exclusion areas in the m-m plane for the T2tt (top left) and T2bW signal topologies (with x =0.25, 0.50, 0.75).
0.50 T2bW: pdf, png, root
0.75 T2bW: pdf, png, root
 

Supplementary plots

Top reconstruction

Figure Formats Caption
Top pT: pdf, png
Parton distance: pdf, png
Left: The leading and sub-leading generator level top quark pT in T2tt signal events with MStop = 600 GeV and MLSP = 50 GeV. Right: The minimum angular distance between the six patrons originating from the top quark decays in fully hadronic T2tt signal events.
Picky jet splitting: pdf, png
Top pair quality: pdf, png
Left: The picky jet splitting MVA discriminator output for a single lepton control region in data and MC simulated data. Right: The top pair quality MVA discriminator output of the highest quality top pair for a single lepton control region in data and MC simulated data.
: pdf, png
QCD: pdf, png
Left: The highest quality top candidate pT in data divided by the same in MC simulated data for a single lepton control region. Right: The leading top candidate pT of the highest quality reconstructed top pair in data divided by the same in MC simulated data for a high QCD control region. In both figures the MC simulated data yield has been normalized to the data yield before any selection on top reconstruction.

Search regions

Figure Formats Caption
Discriminator output: pdf, png
Invariant mass: pdf, png
The distributions of properties of reconstructed top pairs are shown for data together with signal and background MC simulated data samples for three choices of MStop and MLSP after the baseline selection. Left: The discriminator output of the MVA used to identify low pT top candidates for the sub-leading reconstructed top, defined as the top candidate of the pair with the highest discriminator value. Right: The invariant mass of the reconstructed top pair.
HT ratio: pdf, png
Transverse mass: pdf, png
The distributions of properties of reconstructed top pairs are shown for data together with signal and background MC simulated data samples for three choices of MStop, MLSP, and x after the baseline selection. Left: The scalar sum of jet pT for all jets satisfying divided by the same quantity for all other jets. Right: The transverse mass constructed with and the b-tagged jet closest to

Background estimation

Figure Formats Caption
Correction factor: pdf, png
HT: pdf, png
Left: The theoretical modeling correction factor applied to MC simulated data events as a function of leading top quark pT. Right: HT comparison for data and corrected MC simulated data. ``Data'' is the ratio of event yields in data to the MC simulated data event yields for a and W+jets single-lepton control sample.
T2bW: pdf, png
T2tt: pdf, png
The largest single variable non-closure in MC simulated data when compared to data of all MVA input variables for Z+jets dilepton control samples, with leptons removed.
  pdf, png The minimum angular distance between and the three leading jets in data is compared to MC simulated data with the baseline QCD multijet prediction and with the upper bound QCD multijet prediction for a high control region. The upper bound QCD multijet prediction is obtained by increasing the size of the b-jet angular correction.
: pdf, png
Di-boson: pdf, png
The data and MC simulated data picky jet multiplicitity for three lepton (left) and di-boson (right) control regions.

Interpretation

Figure Formats Caption
T2tt: pdf, png, root
0.25 T2bW: pdf, png, root
Search region signal selection efficiency in the m-m plane for the T2tt (top left) and T2bW signal topologies (with x =0.25, 0.50, 0.75). The selection efficiency of the search region providing the most stringent expected limit is shown for each signal point.
0.50 T2bW: pdf, png, root
0.75 T2bW: pdf, png, root
 
T2tt: pdf, png
0.25 T2bW: pdf, png
Total relative systematic uncertainty on the search region signal yield in the m-m plane for the T2tt (top left) and T2bW signal topologies (with x =0.25, 0.50, 0.75). The uncertainty of the search region providing the most stringent expected limit is shown for each signal point.
0.50 T2bW: pdf, png
0.75 T2bW: pdf, png
 

-- NickolasMcColl - 2015-07-15

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PDFpdf mc_over_data_1l_T2bw_discri_4.pdf r1 manage 15.6 K 2015-08-13 - 10:03 NickolasMcColl  
PNGpng mc_over_data_1l_T2bw_discri_4.png r1 manage 42.5 K 2015-08-13 - 10:03 NickolasMcColl  
PDFpdf mc_over_data_1l_T2bw_discri_5.pdf r1 manage 15.6 K 2015-08-13 - 10:03 NickolasMcColl  
PNGpng mc_over_data_1l_T2bw_discri_5.png r1 manage 42.3 K 2015-08-13 - 10:03 NickolasMcColl  
PDFpdf mc_over_data_1l_T2tt_discri_1.pdf r1 manage 15.6 K 2015-08-13 - 10:03 NickolasMcColl  
PNGpng mc_over_data_1l_T2tt_discri_1.png r1 manage 41.0 K 2015-08-13 - 10:03 NickolasMcColl  
PDFpdf mc_over_data_1l_T2tt_discri_2.pdf r1 manage 15.6 K 2015-08-13 - 10:03 NickolasMcColl  
PNGpng mc_over_data_1l_T2tt_discri_2.png r1 manage 41.3 K 2015-08-13 - 10:03 NickolasMcColl  
PDFpdf mc_over_data_1l_T2tt_discri_3.pdf r1 manage 15.5 K 2015-08-13 - 10:03 NickolasMcColl  
PNGpng mc_over_data_1l_T2tt_discri_3.png r1 manage 40.9 K 2015-08-13 - 10:03 NickolasMcColl  
PDFpdf mc_over_data_1l_T2tt_discri_4.pdf r1 manage 15.5 K 2015-08-13 - 10:03 NickolasMcColl  
PNGpng mc_over_data_1l_T2tt_discri_4.png r1 manage 41.7 K 2015-08-13 - 10:03 NickolasMcColl  
PDFpdf mc_over_data_Zll_T2bw_discri_1.pdf r1 manage 14.3 K 2015-08-13 - 10:03 NickolasMcColl  
PNGpng mc_over_data_Zll_T2bw_discri_1.png r1 manage 40.3 K 2015-08-13 - 10:03 NickolasMcColl  
PDFpdf mc_over_data_Zll_T2bw_discri_2.pdf r1 manage 14.3 K 2015-08-13 - 10:01 NickolasMcColl  
PNGpng mc_over_data_Zll_T2bw_discri_2.png r1 manage 40.2 K 2015-08-13 - 10:01 NickolasMcColl  
PDFpdf mc_over_data_Zll_T2bw_discri_3.pdf r1 manage 14.3 K 2015-08-13 - 10:01 NickolasMcColl  
PNGpng mc_over_data_Zll_T2bw_discri_3.png r1 manage 40.8 K 2015-08-13 - 10:01 NickolasMcColl  
PDFpdf mc_over_data_Zll_T2bw_discri_4.pdf r1 manage 14.3 K 2015-08-13 - 10:01 NickolasMcColl  
PNGpng mc_over_data_Zll_T2bw_discri_4.png r1 manage 40.8 K 2015-08-13 - 10:01 NickolasMcColl  
PDFpdf mc_over_data_Zll_T2bw_discri_5.pdf r1 manage 14.3 K 2015-08-13 - 10:01 NickolasMcColl  
PNGpng mc_over_data_Zll_T2bw_discri_5.png r1 manage 40.6 K 2015-08-13 - 10:01 NickolasMcColl  
PDFpdf mc_over_data_Zll_T2tt_discri_1.pdf r1 manage 14.3 K 2015-08-13 - 10:00 NickolasMcColl  
PNGpng mc_over_data_Zll_T2tt_discri_1.png r1 manage 39.4 K 2015-08-13 - 10:00 NickolasMcColl  
PDFpdf mc_over_data_Zll_T2tt_discri_2.pdf r1 manage 14.3 K 2015-08-13 - 10:00 NickolasMcColl  
PNGpng mc_over_data_Zll_T2tt_discri_2.png r1 manage 39.6 K 2015-08-13 - 10:00 NickolasMcColl  
PDFpdf mc_over_data_Zll_T2tt_discri_3.pdf r1 manage 14.3 K 2015-08-13 - 10:00 NickolasMcColl  
PNGpng mc_over_data_Zll_T2tt_discri_3.png r1 manage 39.3 K 2015-08-13 - 10:00 NickolasMcColl  
PDFpdf mc_over_data_Zll_T2tt_discri_4.pdf r1 manage 14.3 K 2015-08-13 - 10:00 NickolasMcColl  
PNGpng mc_over_data_Zll_T2tt_discri_4.png r1 manage 39.6 K 2015-08-13 - 10:00 NickolasMcColl  
PDFpdf met.pdf r1 manage 19.1 K 2015-08-13 - 09:52 NickolasMcColl  
PNGpng met.png r1 manage 3.5 K 2015-08-13 - 09:52 NickolasMcColl  
PDFpdf metv.pdf r1 manage 19.5 K 2015-08-13 - 09:52 NickolasMcColl  
PNGpng metv.png r1 manage 3.8 K 2015-08-13 - 09:52 NickolasMcColl  
PDFpdf mva_vars_T2bW_preselection__ht_along_over_away.pdf r1 manage 17.6 K 2015-08-13 - 10:18 NickolasMcColl  
PNGpng mva_vars_T2bW_preselection__ht_along_over_away.png r1 manage 50.1 K 2015-08-13 - 10:18 NickolasMcColl  
PDFpdf mva_vars_T2bW_preselection__mTb.pdf r1 manage 17.8 K 2015-08-13 - 10:18 NickolasMcColl  
PNGpng mva_vars_T2bW_preselection__mTb.png r1 manage 56.4 K 2015-08-13 - 10:18 NickolasMcColl  
PDFpdf mva_vars_T2tt_preselection__min_dphi_top2_j_met.pdf r1 manage 17.0 K 2015-08-13 - 09:59 NickolasMcColl  
PNGpng mva_vars_T2tt_preselection__min_dphi_top2_j_met.png r1 manage 52.4 K 2015-08-13 - 09:59 NickolasMcColl  
PDFpdf mva_vars_T2tt_preselection__min_dr_top1_jj.pdf r1 manage 17.6 K 2015-08-13 - 09:59 NickolasMcColl  
PNGpng mva_vars_T2tt_preselection__min_dr_top1_jj.png r1 manage 50.6 K 2015-08-13 - 09:59 NickolasMcColl  
PDFpdf mva_vars_T2tt_preselection__top12_mass.pdf r1 manage 17.8 K 2015-08-13 - 10:18 NickolasMcColl  
PNGpng mva_vars_T2tt_preselection__top12_mass.png r1 manage 51.4 K 2015-08-13 - 10:18 NickolasMcColl  
PDFpdf mva_vars_T2tt_preselection__top2_fat_quality.pdf r1 manage 18.7 K 2015-08-13 - 10:18 NickolasMcColl  
PNGpng mva_vars_T2tt_preselection__top2_fat_quality.png r1 manage 54.9 K 2015-08-13 - 10:18 NickolasMcColl  
PDFpdf stop.pdf r1 manage 18.7 K 2015-08-13 - 09:52 NickolasMcColl  
PNGpng stop.png r1 manage 1.6 K 2015-08-13 - 09:52 NickolasMcColl  
PDFpdf table1.pdf r1 manage 45.6 K 2015-08-13 - 09:52 NickolasMcColl  
PNGpng table1.png r1 manage 67.5 K 2015-08-13 - 09:52 NickolasMcColl  
PDFpdf table2.pdf r1 manage 73.3 K 2015-08-13 - 09:52 NickolasMcColl  
PNGpng table2.png r1 manage 92.5 K 2015-08-13 - 09:52 NickolasMcColl  
PDFpdf table3.pdf r2 r1 manage 70.9 K 2015-08-13 - 12:48 NickolasMcColl  
PNGpng table3.png r2 r1 manage 214.6 K 2015-08-13 - 12:48 NickolasMcColl  
PDFpdf table4.pdf r1 manage 45.2 K 2015-08-13 - 09:54 NickolasMcColl  
PNGpng table4.png r1 manage 55.9 K 2015-08-13 - 09:54 NickolasMcColl  
PDFpdf table5.pdf r2 r1 manage 32.4 K 2015-08-13 - 17:16 NickolasMcColl  
PNGpng table5.png r2 r1 manage 59.6 K 2015-08-13 - 17:16 NickolasMcColl  
PDFpdf topPT_dataMC_lep.pdf r1 manage 14.0 K 2015-08-13 - 10:15 NickolasMcColl  
PNGpng topPT_dataMC_lep.png r1 manage 38.7 K 2015-08-13 - 10:15 NickolasMcColl  
PDFpdf topPT_dataMC_qcd.pdf r1 manage 15.4 K 2015-08-13 - 10:15 NickolasMcColl  
PNGpng topPT_dataMC_qcd.png r1 manage 37.9 K 2015-08-13 - 10:15 NickolasMcColl  
PDFpdf tt.pdf r1 manage 11.9 K 2015-08-13 - 09:54 NickolasMcColl  
PNGpng tt.png r1 manage 1.3 K 2015-08-13 - 09:54 NickolasMcColl  
PDFpdf ttbar_HT.pdf r1 manage 14.8 K 2015-08-13 - 10:19 NickolasMcColl  
PNGpng ttbar_HT.png r1 manage 36.3 K 2015-08-13 - 10:19 NickolasMcColl  
PDFpdf ttz.pdf r1 manage 12.2 K 2015-08-13 - 09:54 NickolasMcColl  
PNGpng ttz.png r1 manage 2.6 K 2015-08-13 - 09:54 NickolasMcColl  
PDFpdf ttz_mult.pdf r1 manage 14.9 K 2015-08-13 - 10:21 NickolasMcColl  
PNGpng ttz_mult.png r1 manage 33.2 K 2015-08-13 - 10:21 NickolasMcColl  
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Topic revision: r6 - 2015-08-31 - KeithUlmer
 
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