Search for supersymmetry in events with b-quark jets and missing transverse energy in pp collisions at 7 TeV

Abstract

Results are presented from a search for physics beyond the standard model based on events with large missing transverse energy, at least three jets, and at least one, two, or three b-quark jets. The study is performed using a sample of proton-proton collision data collected at √s = 7 TeV with the CMS detector at the LHC in 2011, with the missing transverse energy distribution as the principal search variable. The integrated luminosity of the sample is 4.98 fb^-1. The observed number of events is found to be consistent with the standard model expectation, which is evaluated using control samples in the data. The results are used to constrain cross sections for the production of supersymmetric particles decaying to b-quark-enriched final states in the context of simplified model spectra.

Link to the 4.98 fb-1 paper

Link to the 1 fb-1 result

Approved Tables and Figures from SUS-12-003 with 4.98 fb-1 ( click on plot to get .pdf )

Table and Figure numbering is taken from the paper.

Summary of Results

Table 1: The definition of the signal (SIG) regions.
The signal regions as defined in Table 1, depicted in the MET versus HT plane. Also shown are the sideband (SB) region used in the nominal top+W background estimation method, and the low sideband (LSB) region used in the QCD background estimation method. (Plot from SUS-12-003 PAS)

Table 7: The SM background estimates from the data-based background procedures in comparison with the observed number of events in data. The first uncertainties are statistical and the second systematic. For the total SM estimates, we give the results based both on the nominal and MET-reweighting methods to evaluate the top quark and W+jets background.

Figure 13a: The data-based background predictions for MET in the 1BL signal region in comparison to data. The top quark and W+jets estimate is based on the nominal method. The hatched bands show the total uncertainty on the prediction, including systematic uncertainties. The uncertainties are correlated between bins. Both the T1bbbb and T1tttt models are plotted for a gluino mass of 925 GeV and an LSP mass of 100 GeV.
Figure 13b: Like Figure 13a but with the 2BT selection.
Figure 13c: Like Figure 13a but with the 3B selection.

Interpretation in Simplified Topologies

Figure 1a: The event diagram for the simplified model T1bbbb.
Figure 14a: The 95% CL observed cross section upper limits for the T1bbbb SMS model, based on the MET-reweighting method to evaluate the top quark and W+jets background. For each point, the selection that provides the best expected cross section limit is used; the kink in the curve is caused by moving to a region where the observed limit is affected by the data being above the prediction in the 2B and 3B search regions. The solid contour shows the 95% CL exclusion limits on the NLO cross section. The dashed contours represent the effect of theory uncertainties on the cross-section. Missing points along the diagonal are due to removal in cases where the uncertainty in ISR modeling appreciably affects the limit.
Link to .C file with ROOT macro and space-delimited contents of this plot
Figure 14b: The expected limits corresponding to Figure 14a. The dashed contours represent the uncertainties on the SM background estimates.
Link to .C file with ROOT macro and space-delimited contents of this plot

The expected and observed limits and corresponding uncertainties from Figures 14a and 14b superimposed on the plane of observed cross section upper limit.

The selection providing the best expected limit for each point in the T1bbbb SMS model, when using the MET-reweighting method to evaluate the top quark and W+jets background. These are the selections used to calculate the final observed limits. Missing points along the diagonal are due to removal in cases where the uncertainty in ISR modeling appreciably affects the limit.
Link to .C file with ROOT macro and space-delimited contents of this plot
The product of acceptance and efficiency for the selection providing the best expected limit for each point in the T1bbbb SMS model, when using the MET-reweighting method to evaluate the top quark and W+jets background. Missing points along the diagonal are due to removal in cases where the uncertainty in ISR modeling appreciably affects the limit.
Link to .C file with ROOT macro and space-delimited contents of this plot

Figure 1b: The event diagram for the simplified model T1tttt.
Figure 15a: The 95% CL observed cross section upper limits for the T1tttt SMS model, based on the nominal method to evaluate the top quark and W+jets background. For each point, the selection that provides the best expected cross section limit is used. The solid contour shows the 95% CL exclusion limits on the NLO cross section. The dashed contours represent the theory uncertainties.
Link to .C file with ROOT macro and space-delimited contents of this plot
Figure 15b: The expected limits corresponding to Figure 15a. The dashed contours represent the uncertainties on the SM background estimates.
Link to .C file with ROOT macro and space-delimited contents of this plot

The expected and observed limits and corresponding uncertainties from Figures 15a and 15b superimposed on the plane of observed cross section upper limit.

The selection providing the best expected limit for each point in the T1tttt SMS model, when using the nominal method to evaluate the top quark and W+jets background. These are the selections used to calculate the final observed limits.
Link to .C file with ROOT macro and space-delimited contents of this plot
The product of acceptance and efficiency for the selection providing the best expected limit for each point in the T1tttt SMS model, when using the nominal method to evaluate the top quark and W+jets background.
Link to .C file with ROOT macro and space-delimited contents of this plot

Number of b jets distribution in data and simulation

Figure 2a : The distributions of the number of b jets for event samples selected with the 1BL requirements, except for the requirement on the number of bjets. The stacked shaded histograms show the background expectation from MC where the statistical uncertainty is represented by the hatched region.
Figure 2b : Like Figure 2a but with the 1BT selection.
Figure 2c : Like Figure 2a but with the 2BT selection.

MET distributions in data and simulation

Figure 3a : The distributions of MET for event samples selected with the 1BL requirements, except for the requirement on MET. The stacked shaded histograms show the background expectation from MC where the statistical uncertainty is represented by the hatched region.
Figure 3b : Like Figure 3a but with the 2BT selection.
Figure 3c : Like Figure 3a but with the 3B selection.

Table 2: The number of data events and corresponding predictions from MC simulation for the signal regions, with normalization to 4.98 fb^-1. The uncertainties on the simulated results are statistical.

Estimation of QCD background

Figure 4: Illustration of variables used to calculate minDeltaPhiNorm for the case of an event with exactly three jets. The light-shaded (light gray) solid arrows show the true pT values of the three jets i, j, and k. The dark-shaded (black) solid arrows show the reconstructed jet pT values. The angles of jets j and k with respect to the direction opposite to jet i are denoted alpha_j and alpha_k. The MET for the event is shown by the dotted (red) arrow. The component of MET perpendicular to jet i, denoted T_i, is shown by the dotted (red) line.

Figure 5a : QCD simulation results: The ratio of the number of events that pass the criterion DeltaPhiMin > 0.3 to the number that fail as a function of MET, for events selected with the 1BL requirements except for those on DeltaPhiMinNorm and MET.
Figure 5b : QCD simulation results: The ratio of the number of events that pass the criterion DeltaPhiMinNorm > 4.0 to the number that fail as a function of MET, for events selected with the 1BL requirements except for those on DeltaPhiMinNorm and MET.
Figure 5c : The same as Figure 5b except for events with zero b jets.

Figure 6a : The ratio N(minDeltaPhiNorm >= 4.0) / N(minDeltaPhiNorm < 4.0) as a function of MET for the zero b jet sample, for events selected with the 1BL requirements, except for those on MET and the number of b jets. The histograms show simulated predictions for the QCD and total SM background.
Figure 6b : Like Figure 6a but with the 1BT selection.
Figure 6c : Like Figure 6a but with the 2BT selection.

Figure 7 : A schematic diagram illustrating the regions used to evaluate the QCD background. The diagram depicts the loose kinematic signal (SIG) regions, which require MET >250 GeV. The concept is the same for the tight regions.

Figure 8a : The distributions of DeltaPhiMinNorm for event samples selected with the 1BL requirements, except for the requirement on DeltaPhiMinNorm. The stacked shaded histograms show the background expectation from MC where the statistical uncertainty is represented by the hatched region.
Figure 8b : Like Figure 8a but with the 2BT selection.
Figure 8c : Like Figure 8a but with the 3B selection.

Table 3: The systematic uncertainties (%) for the QCD background estimate in the SIG regions. Because the 1BT QCD background estimate is zero, we do not present results for 1BT in this table.

Estimation of Z background

Table 4: The systematic uncertainties (%) for the Z->nu nu background estimate in the SIG regions, determined for Z->e e (Z->mu mu) events.

Estimation of top and W backgrounds

Nominal method

Figure 9a : The distributions of MET in simulated events selected with the 1BL requirements, except for the requirement on MET. The square (triangle) symbols show the results for signal SIG (single-lepton SL control) sample events. The small plots below the main figures show the ratio of the SIG to SL curves. The event samples include ttbar, W+jet, and single-top quark events.
Figure 9b: Like Figure 9a but with the 2BT selection.
Figure 9c : Like Figure 9a but with the 3B selection.

Figure 10a : The distributions of MET for the single lepton control sample for event samples selected with the 1BL requirements, except for the requirement on MET. The stacked shaded histograms show the background expectation from MC where the statistical uncertainty is represented by the hatched region.
Figure 10b : Like Figure 10a but with the 2BT selection.
Figure 10c : Like Figure 10a but with the 3B selection.

Figure 11 : A schematic diagram illustrating the regions used for the nominal top quark and W+jets background estimate.

Table 5: The systematic uncertainties (%) for the nominal top quark and W+jets background estimate in the SIG regions.

MET Reweighting method

Figure 12a: The distributions of DeltaThetaT for events with a single e or mu for the 1BL selection criteria. The stacked, shaded histograms show simulated predictions from MC for events in the single lepton sample. The dotted histogram shows the corresponding simulated prediction in the limit of perfect charged lepton reconstruction.
Figure 12b: Like Figure 12a but with the 2BT selection. Also, the MET restriction is loosened, as described in the text.
Figure 12c: Like Figure 12a but with the 3B selection.

Table 6: The systematic uncertainties (%) for the MET-reweighting estimate of the top quark and W+jets background, for category 1 (category 2) events.

Details of limit-setting procedure

Table 8: The observables of the likelihood analysis for the nominal method, representing the signal region and ten sideband regions. The seven observables listed in the upper portion of the table are subject to signal contamination in our analysis.
Table 9: The systematic uncertainties (%) for the signal efficiency of the T1bbbb SMS model with m_gluino = 925 GeV and m_LSP =100 GeV.

-- JoshuaThompson - 27-Jun-2012

Topic attachments
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PDFpdf T1bbbb.pdf r1 manage 8.3 K 2012-06-27 - 18:30 JoshuaThompson  
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PDFpdf selEmissvHT.pdf r1 manage 16.4 K 2012-06-29 - 11:36 JoshuaThompson Graphic showing signal regions in MET versus HT plane
PNGpng selEmissvHT.png r1 manage 29.0 K 2012-06-29 - 11:36 JoshuaThompson Graphic showing signal regions in MET versus HT plane
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