Search for Physics Beyond the Standard Model in Z + MET + Jets events at the LHC

Abstract

This paper presents an update of a search for Physics beyond the Standard Model in final states with a Z boson, jets and missing transverse energy. The Jet-Z Balance method is used to estimate the total background expected in the signal region from data control samples. The size of the data corresponds to an integrated luminosity of 2.1 fb−1. In the absence of any significant excess beyond the SM expectation, upper limits are set in the context of simplified models of supersymmetry, taking into account signal contribution to the control samples.

Approved Plots from SUS-11-019 ( click on plot to get .pdf )

Figure Abbreviated Caption
click on it to get it Dilepton invariant mass distribution in preselected events, for same-flavour (ee or mumu) pairs in data (points) and in MC simulation (histograms). The dashed vertical lines indicate the signal and side-band regions.
click on it to get it Dilepton invariant mass distribution in preselected events, for opposite-flavour (emu) pairs in data (points) and in MC simulation (histograms). The dashed vertical lines indicate the signal and side-band regions.
click on it to get it JZB distribution in ZJets, TTbar and signal MC simulation scaled to 2.1fb-1, after preselection and dilepton invariant mass requirement. The signal distribution corresponds to the SUSY LM4 scenario. Events in the tail are affected by the pile-up reweighting of MC simulation.
click on it to get it Data versus MC comparison of the JZB distribution for the same flavor (ee or mumu) di-leptons consistent with mZ mass.
click on it to get it Data versus MC comparison of the JZB distribution for the opposite flavor (emu) di-leptons consistent with mZ mass.
click on it to get it Data versus MC comparison of the JZB distribution for the same flavor (ee or mumu) di-leptons in the mZ mass sidebands.
click on it to get it Data versus MC comparison of the JZB distribution for the opposite flavor (emu) di-leptons in the mZ mass sidebands.
click on it to get it Comparison of the JZB distributions in the signal region and the control regions in TTbar MC simulation.
click on it to get it Ratio between the JZB distribution in each control region and that in the signal region. The assigned systematic error is also shown.
click on it to get it MC expected observed event yield, compared with the estimated background event yield (MC closure test) in a SM only null hypothesis.
click on it to get it Ratio between observed and predicted JZB distributions in MC, in the SM only null hypothesis. The errors reflect the statistical uncertainty of the corresponding MC samples.
click on it to get it MC expected observed event yield, compared with the estimated background event yield (MC closure test) in a NP signal + background hypothesis.
click on it to get it Ratio between observed and predicted JZB distributions in MC simulation, in the NP signal + background hypothesis. The errors reflect the statistical uncertainty of the corresponding MC samples.
click on it to get it Comparison between the predicted and observed JZB distributions in the CMS data. The predicted distribution has been fitted to display 1 sigma statistical uncertainty bands.
click on it to get it Ratio of observed over predicted event yields in the data. The error bars represent the corresponding statistical uncertainty.
click on it to get it SMS signal efficiency (including acceptance) in the mGluino, mLSP parameter space, for the JZB>50 GeV region.
click on it to get it SMS signal efficiency (including acceptance) in the mGluino, mLSP parameter space, for the JZB>100 GeV region.
click on it to get it SMS signal efficiency (including acceptance) in the mGluino, mLSP parameter space, for the JZB>150 GeV region.
click on it to get it 95% CL upper limits on the cross-section of the inclusive Z boson decay mode in the mGluino,mLSP SMS parameter space. In each point, the best expected limit from the low-, mid-, and high- JZB regions is used. The exclusion curves for reference cross-sections are also shown in this plot.
click on it to get it Map of the JZB region giving the best limit in each point of the parameter space.

Link to SUS-11-019 PAS in CDS

-- KostasTheofilatos - 11-Nov-2011

Topic attachments
I Attachment History Action Size Date Who Comment
PDFpdf Bpred_Data.pdf r1 manage 17.6 K 2011-11-12 - 02:08 KostasTheofilatos  
PNGpng Bpred_Data.png r1 manage 118.9 K 2011-11-12 - 02:08 KostasTheofilatos  
PDFpdf Bpred_MC.pdf r1 manage 18.2 K 2011-11-12 - 02:16 KostasTheofilatos  
PNGpng Bpred_MC.png r1 manage 97.5 K 2011-11-12 - 02:16 KostasTheofilatos  
PDFpdf Bpred_MCwithS.pdf r1 manage 21.8 K 2011-11-12 - 02:15 KostasTheofilatos  
PNGpng Bpred_MCwithS.png r1 manage 120.5 K 2011-11-12 - 02:17 KostasTheofilatos  
PDFpdf Efficiency100.pdf r1 manage 26.3 K 2011-11-12 - 02:10 KostasTheofilatos  
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PDFpdf Efficiency150.pdf r1 manage 25.8 K 2011-11-12 - 02:10 KostasTheofilatos  
PNGpng Efficiency150.png r1 manage 112.4 K 2011-11-12 - 02:10 KostasTheofilatos  
PDFpdf Efficiency50.pdf r1 manage 26.5 K 2011-11-12 - 02:09 KostasTheofilatos  
PNGpng Efficiency50.png r1 manage 112.1 K 2011-11-12 - 02:09 KostasTheofilatos  
PDFpdf SourceOfBestLimits.pdf r2 r1 manage 22.2 K 2011-11-22 - 10:32 KostasTheofilatos  
PNGpng SourceOfBestLimits.png r2 r1 manage 23.2 K 2011-11-22 - 10:32 KostasTheofilatos  
PDFpdf final_exclusion__bestlimits_PDF.pdf r1 manage 39.1 K 2011-11-12 - 02:11 KostasTheofilatos  
PNGpng final_exclusion__bestlimits_PDF.png r1 manage 150.2 K 2011-11-12 - 02:11 KostasTheofilatos  
PDFpdf jzb_OS_OFSB_coarse.pdf r3 r2 r1 manage 21.2 K 2011-11-22 - 13:59 KostasTheofilatos  
PNGpng jzb_OS_OFSB_coarse.png r3 r2 r1 manage 18.2 K 2011-11-22 - 13:59 KostasTheofilatos  
PDFpdf jzb_OS_OFZP_coarse.pdf r4 r3 r2 r1 manage 20.9 K 2011-11-22 - 14:00 KostasTheofilatos  
PNGpng jzb_OS_OFZP_coarse.png r3 r2 r1 manage 18.2 K 2011-11-22 - 14:01 KostasTheofilatos  
PDFpdf jzb_OS_SFSB_coarse.pdf r3 r2 r1 manage 21.2 K 2011-11-22 - 14:01 KostasTheofilatos  
PNGpng jzb_OS_SFSB_coarse.png r3 r2 r1 manage 18.5 K 2011-11-22 - 14:01 KostasTheofilatos  
PDFpdf jzb_OS_SFZP_coarse.pdf r4 r3 r2 r1 manage 21.2 K 2011-11-22 - 14:02 KostasTheofilatos  
PNGpng jzb_OS_SFZP_coarse.png r3 r2 r1 manage 18.8 K 2011-11-22 - 14:03 KostasTheofilatos  
PDFpdf jzb_bg_vs_signal_distribution.pdf r1 manage 16.5 K 2011-11-12 - 02:00 KostasTheofilatos  
PNGpng jzb_bg_vs_signal_distribution.png r1 manage 92.4 K 2011-11-12 - 02:00 KostasTheofilatos  
PDFpdf jzb_bg_vs_signal_distribution_SMS__summary.pdf r1 manage 20.4 K 2011-11-12 - 02:13 KostasTheofilatos  
PNGpng jzb_bg_vs_signal_distribution_SMS__summary.png r1 manage 146.3 K 2011-11-12 - 02:12 KostasTheofilatos  
PDFpdf jzb_ratio_data.pdf r1 manage 15.1 K 2011-11-12 - 02:08 KostasTheofilatos  
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PDFpdf jzb_ratio_mc.pdf r1 manage 14.9 K 2011-11-12 - 02:06 KostasTheofilatos  
PNGpng jzb_ratio_mc.png r1 manage 75.2 K 2011-11-12 - 02:06 KostasTheofilatos  
PDFpdf jzb_ratio_mc_BandS.pdf r1 manage 14.9 K 2011-11-12 - 02:28 KostasTheofilatos  
PNGpng jzb_ratio_mc_BandS.png r1 manage 75.2 K 2011-11-12 - 02:28 KostasTheofilatos  
PDFpdf mll_lines.pdf r3 r2 r1 manage 16.3 K 2011-11-22 - 13:53 KostasTheofilatos  
PNGpng mll_lines.png r5 r4 r3 r2 r1 manage 18.0 K 2011-11-22 - 13:53 KostasTheofilatos  
PDFpdf mll_osof_lines.pdf r3 r2 r1 manage 16.4 K 2011-11-22 - 13:53 KostasTheofilatos  
PNGpng mll_osof_lines.png r3 r2 r1 manage 16.6 K 2011-11-22 - 13:54 KostasTheofilatos  
PDFpdf ttbar_comparison.pdf r2 r1 manage 14.8 K 2011-11-22 - 11:07 KostasTheofilatos  
PNGpng ttbar_comparison.png r2 r1 manage 14.8 K 2011-11-22 - 11:07 KostasTheofilatos  
PDFpdf ttbar_comparison_ratio.pdf r2 r1 manage 15.3 K 2011-11-22 - 11:07 KostasTheofilatos  
PNGpng ttbar_comparison_ratio.png r2 r1 manage 16.3 K 2011-11-22 - 11:08 KostasTheofilatos  
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