Search for physics beyond the standard model in events with τ-leptons in the presence of multijets and large momentum imbalance in pp collisions at √s= 7 TeV.

Susy_decay.png

Abstract

A search for physics beyond the standard model is performed with one or more hadronically decaying τ-leptons, highly energetic jets and large momentum imbalance in the final state. The data sample corresponds to an integrated luminosity of 4.98 fb-1 of pp collisions at √s = 7 TeV collected with the CMS detector at the LHC. The number of observed events is consistent with data-driven predictions for standard model processes. In the absence of any evidence of supersymmetry, upper limits on the mass of the gluino have been set.

Physics Analysis Summary

PAS-SUS-12-004

Approved Plots from SUS-12-004 (Click on figure for pdf)

Figure Abbreviated Caption
Figure_001a.pdf Figure 1: (a) dependence of the τh reconstruction efficiency on the number of additional particles in the isolation cone in bins of τh lepton pT for the single τh final state where, N is the number of photons and charged hadrons in the isolation cone.

Figure_001b.pdf Figure 1: (b) dependence of pTτ,gen on the τh response. Both distributions are derived from a simulated sample of W + jets events.

Figure_002a.pdf Figure 2: (a) Distribution of HT50 for the genuine τh estimate in W + jets simulated events for the single τh final state. The black triangles are the simulated events which pass the baseline selection and have a reconstructed τh matched to the visible part of a generated, hadronically decaying τ-lepton. The filled green areas show the prediction obtained from the muon control sample. The hatched area is the total uncertainty on the prediction.

Figure_002b.pdf Figure 2: (b) Distribution of MHT for the genuine τh estimate in W + jets simulated events for the single τh final state. The black triangles are the simulated events which pass the baseline selection and have a reconstructed τh matched to the visible part of a generated, hadronically decaying τ-lepton. The filled green areas show the prediction obtained from the muon control sample. The hatched area is the total uncertainty on the prediction.

Figure_003a.pdf Figure 3: (a) The rate of jet misidentification as a τh lepton in simulation (triangular markers) and data (circular markers) as a function of pTjet for events with HT50 > 350 GeV and 40 < MHT < 60 GeV.

Figure_003b.pdf Figure 3 (b) MHT distribution for the τh misidentification rate estimated in simulated events with HT50 > 350 GeV, where the triangular symbols represent events that pass the baseline selection, the filled blue area shows the predicted events and the hatched area shows the total uncertainty on the prediction. These distributions correspond to the single τh final state.

Figure_004a.pdf Data-MC comparison for the τh τh final state.

Figure 4 (a) pT distribution of the τh candidate in the ttbar CR.

Figure_004b.pdf Data-MC comparison for the τh τh final state.

Figure 4 (b) MHT distribution in the Z(→μμ) + jets CR which is used to estimate the number of Z(→νν) + jets events.

Figure_004c.pdf Data-MC comparison for the τh τh final state.

Figure 4 (c) MET distribution in the W + jets CR,

Figure_004d.pdf Data-MC comparison for the τh τh final state.

Figure 4 (d) SM background enhanced sample depicting the effectiveness of Δφ (MHT, j2) < 0.10 in selecting a sample where 99% of the events are multijet

Figure_005a.pdf Figure 5: (a) Distribution of HT50 for the single τh final state. The points with errors represent data that satisfy the baseline selection while the filled green (light) and filled blue (dark) areas shows the predicted backgrounds due to events containing a real τh and a misidentified τh respectively. The hatched area shows the total uncertainty on the prediction.

Figure_005b.pdf Figure 5: (b) Distribution of MHT for the single τh final state. The points with errors represent data that satisfy the baseline selection while the filled green (light) and filled blue (dark) areas shows the predicted backgrounds due to events containing a real τh and a misidentified τh respectively. The hatched area shows the total uncertainty on the prediction.

Figure_006a.pdf Figure 6: (a) Stacked distributions of HT30 in the SR in the case of the τhτh final state. The background distributions are taken from MC normalized to the data-driven predictions over the full region; the MC shapes are not known to be well modeled.

Figure_006b.pdf Figure 6: (b) Stacked distributions of HT30 + MHT in the SR in the case of the τhτh final state. The background distributions are taken from MC normalized to the data-driven predictions over the full region; the MC shapes are not known to be well modeled.

Figure_007a.pdf Figure 7: (a) Exclusion limits in the cMSSM plane at tanβ = 40 for the single τh final state. The observed and expected limits are shown by the solid red and blue lines respectively. The blue band represents the experimental uncertainties while the red dotted lines represent the theoretical uncertainties for events passing the full selection.

Figure_007b.pdf Figure 7: (b) Exclusion limit in the cMSSM plane at tanβ = 40 for the τhτh final state. The solid red line denotes the experimental limit while the dotted red lines represent the uncertainty on the experimental limit due to uncertainties on the theoretical cross sections. The blue band represents the expected uncertainties.

Figure_008.pdf Figure 8: Feynman diagram for the T3tauh SMS model.

Figure_009a.pdf Exclusion limits are shown for the τhτh final state.

Figure 9 (a) 95% CL cross section upper limits for the T3tauh model where the solid red line represents the limits on the mass of the gluino and the LSP.

Figure_009b.pdf Exclusion limits are shown for the τhτh final state.

Figure 9 (b) 95% CL cross section upper limits as a function of gluino mass in the GMSB scenario.

Estimated and observed background in single τh.(click to get .png)

Table 1: The estimated (predicted) and observed (selected) background contributions for simulated events with a genuine τh passing the baseline and full selection in the single τh final state. The reconstructed τh is required to match the visible part of the generated, hadronically decaying τ-lepton. The predictions are derived from the muon control sample.

Percentage of multijet events in MHT in single τh.(click to get .png)

Table 2: The percentage of multijet events in the MHT binned samples for different multijet dominated regions in the single τh final state.

Signal and background in single τh.(click to get .png)

Table 3: Number of data and estimated background events with statistical and systematic uncertainties in the single τh final state.

Signal and background in τhτh final state.(click to get .png)

Table 4: Number of data and estimated background events with statistical and systematic uncertainties in the multiple τh final state.

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