TWiki> CMSPublic Web>PhysicsResultsSUS12011 (2013-01-23, SeemaSharma) EditAttachPDF

Search for new physics in the multijets + missing transverse energy final state in 7 TeV proton-proton collisions

This analysis is published as PRL 109, 171803 (2012) (also available on arXiv:1207.1898).

Abstract

A search for physics beyond the standard model is performed in events with at least three jets and large missing transverse momentum produced in proton-proton collisions at sqrt(s)=7 TeV. No significant excess of events above the expected backgrounds is observed in 4.98 inverse femtobarns of data collected with the CMS detector at the Large Hadron Collider. The results are presented in the context of the constrained minimal supersymmetric extension of the standard model and more generically for simplified models. These results significantly extend previous searches.

Results and Interpretation

( Click on plot to get .pdf )

Summary of Results

Background distributions predicted from data compared to the distributions observed in data: (a) HT, (b) MHT. Last bins include overflow
RA2DataVsEstimatedBkg.png

Same plots on individual canvases  
RA2DataVsEstimatedBkg_HT.png RA2DataVsEstimatedBkg_MHT.png

Number of events observed in data and prediction of various backgrounds from data 14 search bins defined in bins of HT and MHT.
ResultsSummaryTable.png

Summary of number of events observed in data and prediction of various backgrounds from data 14 search bins defined in bins of HT and MHT.
c_RA2ResultSummaryHTMHT.png

Interpretation of Results in CMSSM

Exclusion in the m0-m1/2 plane Exclusion in m(gluino)-m(squark) plane
cMSSMlimit_m0_m12 CMSSM.png
TGraph of the observed exclusion contour in the m0-m1/2 plane TGraph of the observed exclusion contour in the m(gluino)-m(squark) plane

cMSSM Observed cross section limit in m0-m1/2 plane CMSSM Expected cross section limit in m0-m1/2 plane
cMSSM_Mzero_Mhalf_ObsXsecLimit cMSSM_Mzero_Mhalf_ExpXsecLimit
(Empty bins correspond to regions disregarded in the calculation due to lack of modeling or lack of limit convergence).

Interpretation of Results for Simplified Topologies

Observed and expected cross section limit in mother-daughter mass plane for gluino pair production (T1) and squark pair production (T2).
Text files T1Observed and T1Expected Text files T2Observed and T2Expected
T1_combined_allINone T2_combined_allINone

Efficiency maps  
(a) gluino pair production (T1) (b) squark pair production (T2)
Text files are attached here Text files are attached here
effMapT1_4x4.png effMapT2_4x4.png

Observed and expected cross section limit in mother-daughter mass plane for gluino pair production with Z bosons as intermediate decay particles (T5ZZInc) and gluino pair production with four b quarks (T1bbbb).
Text files T5ZZIncObserved and T5ZZIncExpected Text files T1bbbbObserved and T1bbbbExpected
T5ZZInc_combined_allINone T1bbbb_combined_allINone

Efficiency maps  
(a) gluino pair production with Z bosons as intermediate decay particles (T5ZZInc) (b) gluino pair production with four b quarks (T1bbbb)
Text files are attached here Text files are attached here
effMapT5ZZInc_4x4.png effMapT1bbbb_4x4.png

Estimation of hadronic tau background

Tau Hadronic : Closure of method in HT and MHT
closurePlotsMix_NEW_baseline.png

Tau Hadronic : Comparison of prediction of HT and MHT from data and prediction from MC simulation for baseline selection.
closurePlotsData_NEW_baseline.png

Estimation of Z(ν ν)+Jets Invisible background

Comparison of photon + jets control sample in data and simulated events : HT and MHT are calculated ignoring the photon and all the baseline selections are applied.
(a) HT (b) MHT
c_h_RA2_HT_DataMC_Scaled.png c_h_RA2_MHT_DataMC_Scaled.png

Comparison of Z(dimuon) + jets control sample in data and simulated events : HT and MHT are calculated ignoring the muons and all the baseline selections are applied except for the MHT cut.
(a) HT (b) MHT
ht_ht350_data_SMs11-4p98fb_app.png mht_ht350_data_SMs11-4p98fb_app.png

Estimation of background due to multijets

Estimation of tails of respose function in data and MC
(a) dijet asymmetry distribution (b) extrapolation of fractional number of tail events
Tail_163337-180252_SUS-12-011_Sig25-Inf_PF_EtaBin0_PtBin3_Pt3Bin2_PtSmearAsymTail.png

Tail scaling factors used in R+S
(a) abs(η) < 0.5 (b) 1.1 < abs(η) <1.7
Tail_163337-180252_SUS-12-011_Sig25-Inf_PF_ScaleFactors_Eta0.png Tail_163337-180252_SUS-12-011_Sig25-Inf_PF_ScaleFactors_Eta2.png

Closure test of Rebalance + Smearing method in various selection regions
(a) at least 3 jets (b) at least 3 jets + HT>500 GeV
QCD_SmearingClosure_OnMC_PreSelection_HT.png QCD_SmearingClosure_OnMC_LowNoDeltaPhi_MHT.png
(c) at least 3 jets + HT>800 GeV, dPhi cuts (d) at least 3 jets + HT>1400 GeV, dPi cuts
QCD_SmearingClosure_OnMC_MediumHT_MHT.png QCD_SmearingClosure_OnMC_ExtremeHighHT_MHT.png

Intrinsic bias of R+S method. The R+S method is applied a second time to the output of a first iteration and then the two iterations are compared. No bias is observed.
QCD_RS2vsRS1_OnMC_ExtremeHighHT_MHT.png

Attachments Attachments
Topic attachments
I Attachment History Action Size Date Who Comment
Compressed Zip archivetar AccEff_T1_14SearchBins.tar r1 manage 1830.0 K 2012-07-23 - 06:19 SeemaSharma  
Compressed Zip archivetar AccEff_T1bbbb_14SearchBins.tar r1 manage 187.0 K 2012-08-13 - 20:26 HongxuanLiu  
Compressed Zip archivetar AccEff_T2_14SearchBins.tar r1 manage 1830.0 K 2012-07-23 - 06:19 SeemaSharma  
Compressed Zip archivetar AccEff_T5ZZInc_14SearchBins.tar r1 manage 185.3 K 2012-08-13 - 20:26 HongxuanLiu  
C source code filec CrossSec_T1_combined_expLimit.C r1 manage 65.5 K 2012-06-08 - 12:19 SeemaSharma Exp. xsec limits for topology T1
C source code filec CrossSec_T1_combined_obsLimit.C r1 manage 65.6 K 2012-06-08 - 12:20 SeemaSharma Obs. xsec limits for topology T1
C source code filec CrossSec_T1bbbb_combined_expLimit.C r1 manage 89.0 K 2012-08-13 - 19:33 HongxuanLiu  
C source code filec CrossSec_T1bbbb_combined_obsLimit.C r1 manage 89.0 K 2012-08-13 - 19:33 HongxuanLiu  
C source code filec CrossSec_T2_combined_expLimit.C r1 manage 65.5 K 2012-06-08 - 12:21 SeemaSharma Exp. xsec limits for topology T2
C source code filec CrossSec_T2_combined_obsLimit.C r1 manage 65.6 K 2012-06-08 - 12:21 SeemaSharma Obs. xsec limits for topology T1
C source code filec CrossSec_T5ZZInc_combined_expLimit.C r1 manage 80.5 K 2012-08-13 - 19:33 HongxuanLiu  
C source code filec CrossSec_T5ZZInc_combined_obsLimit.C r1 manage 80.5 K 2012-08-13 - 19:33 HongxuanLiu  
PDFpdf QCD_RS2vsRS1_OnMC_ExtremeHighHT_MHT.pdf r1 manage 17.5 K 2012-05-02 - 05:36 SeemaSharma  
PNGpng QCD_RS2vsRS1_OnMC_ExtremeHighHT_MHT.png r1 manage 14.4 K 2012-05-02 - 05:37 SeemaSharma  
PDFpdf QCD_SmearingClosure_OnMC_ExtremeHighHT_MHT.pdf r1 manage 16.4 K 2012-05-02 - 05:37 SeemaSharma  
PNGpng QCD_SmearingClosure_OnMC_ExtremeHighHT_MHT.png r1 manage 14.3 K 2012-05-02 - 05:37 SeemaSharma  
PNGpng QCD_SmearingClosure_OnMC_LowNoDeltaPhi_MHT.png r1 manage 14.2 K 2012-05-02 - 05:38 SeemaSharma  
PDFpdf QCD_SmearingClosure_OnMC_MediumHT_MHT.pdf r1 manage 16.1 K 2012-05-02 - 05:38 SeemaSharma  
PNGpng QCD_SmearingClosure_OnMC_MediumHT_MHT.png r1 manage 13.9 K 2012-05-02 - 05:39 SeemaSharma  
PDFpdf QCD_SmearingClosure_OnMC_PreSelection_HT.pdf r1 manage 18.9 K 2012-05-02 - 05:39 SeemaSharma  
PNGpng QCD_SmearingClosure_OnMC_PreSelection_HT.png r1 manage 15.8 K 2012-05-02 - 05:39 SeemaSharma  
PDFpdf RA2DataVsEstimatedBkg.pdf r1 manage 17.8 K 2012-09-25 - 13:22 MatthiasSchroederHH  
PNGpng RA2DataVsEstimatedBkg.png r1 manage 23.1 K 2012-09-25 - 13:22 MatthiasSchroederHH  
PDFpdf RA2DataVsEstimatedBkg_HT.pdf r1 manage 14.8 K 2013-01-23 - 10:22 MatthiasSchroederHH HT and MHT data vs data-based bkg, plots on individual canvases
PNGpng RA2DataVsEstimatedBkg_HT.png r1 manage 19.3 K 2013-01-23 - 10:22 MatthiasSchroederHH HT and MHT data vs data-based bkg, plots on individual canvases
PDFpdf RA2DataVsEstimatedBkg_MHT.pdf r1 manage 14.5 K 2013-01-23 - 10:22 MatthiasSchroederHH HT and MHT data vs data-based bkg, plots on individual canvases
PNGpng RA2DataVsEstimatedBkg_MHT.png r1 manage 18.8 K 2013-01-23 - 10:22 MatthiasSchroederHH HT and MHT data vs data-based bkg, plots on individual canvases
PDFpdf RA2DataVsEstimatedBkg_TWiki_prelim.pdf r2 r1 manage 17.8 K 2012-07-23 - 05:48 SeemaSharma  
PNGpng RA2DataVsEstimatedBkg_TWiki_prelim.png r2 r1 manage 69.4 K 2012-07-23 - 05:48 SeemaSharma  
PDFpdf ResultsSummaryTable.pdf r2 r1 manage 68.0 K 2012-07-23 - 06:43 SeemaSharma  
PNGpng ResultsSummaryTable.png r2 r1 manage 73.8 K 2012-07-23 - 06:43 SeemaSharma  
PDFpdf T1T2_combined_allINone.pdf r1 manage 46.0 K 2012-07-23 - 06:09 SeemaSharma  
PNGpng T1T2_combined_allINone.png r1 manage 81.5 K 2012-07-23 - 06:09 SeemaSharma  
PDFpdf T1_combined_allINone.pdf r1 manage 33.1 K 2012-07-23 - 21:01 SeemaSharma  
PNGpng T1_combined_allINone.png r1 manage 38.5 K 2012-07-23 - 21:01 SeemaSharma  
PDFpdf T1bbbb_combined_allINone.pdf r1 manage 33.0 K 2012-08-13 - 18:06 HongxuanLiu  
PNGpng T1bbbb_combined_allINone.png r1 manage 38.6 K 2012-08-13 - 18:11 HongxuanLiu  
PDFpdf T2_combined_allINone.pdf r1 manage 32.1 K 2012-07-23 - 21:01 SeemaSharma  
PNGpng T2_combined_allINone.png r1 manage 37.5 K 2012-07-23 - 21:01 SeemaSharma  
PDFpdf T5ZZInc_combined_allINone.pdf r1 manage 32.1 K 2012-08-13 - 18:06 HongxuanLiu  
PNGpng T5ZZInc_combined_allINone.png r1 manage 37.3 K 2012-08-13 - 18:11 HongxuanLiu  
PDFpdf Tail_163337-180252_SUS-12-011_Sig25-Inf_PF_EtaBin0_PtBin3_Extrapolation.pdf r2 r1 manage 12.4 K 2012-07-23 - 05:38 SeemaSharma  
PNGpng Tail_163337-180252_SUS-12-011_Sig25-Inf_PF_EtaBin0_PtBin3_Extrapolation.png r2 r1 manage 13.0 K 2012-07-23 - 05:38 SeemaSharma  
PDFpdf Tail_163337-180252_SUS-12-011_Sig25-Inf_PF_EtaBin0_PtBin3_Pt3Bin2_PtSmearAsymTail.pdf r2 r1 manage 17.0 K 2012-07-23 - 05:38 SeemaSharma  
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PDFpdf Tail_163337-180252_SUS-12-011_Sig25-Inf_PF_ScaleFactors_Eta0.pdf r2 r1 manage 10.2 K 2012-07-23 - 05:41 SeemaSharma  
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C source code filec cMSSM_MGluino_MSquark_Exclusion_.C r1 manage 5.6 K 2012-05-02 - 05:45 SeemaSharma  
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C source code filec cMSSM_Mzero_Mhalf_Exclusion_.C r1 manage 9.9 K 2012-05-02 - 05:45 SeemaSharma  
PDFpdf cMSSM_Mzero_Mhalf_ExpXsecLimit.pdf r1 manage 39.9 K 2012-07-23 - 17:06 SeemaSharma  
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