Search for supersymmetry with the razor variables at √s = 7 TeV

Link to cdsweb CDS PAS-SUS-11-008

Abstract

A search is performed for heavy particle pairs produced in √s = 7 TeV proton-proton collisions with 800 pb−1 of data collected by the CMS experiment in 2011 at the CERN Large Hadron Collider. The search is sensitive to generic supersymmetry models provided superpartner particles are kinematically accessible, with minimal assumptions on properties of the lightest superpartner particle. The kinematic consistency of the selected events is tested against the hypothesis of heavy particle pair production using the dimensionless razor variable R, related to the missing transverse energy ETmiss. The new physics signal is characterized by a broad peak in the distribution of MR, an event-by-event indicator of the heavy particle mass scale. This approach is complementary to ETmiss based searches. After background modeling based on data and background rejection based on R and MR no significant excess of events is found beyond the Standard Model expectations. The results are interpreted in the context of the Constrained Minimal Supersymmetric Standard Model.

Razor cartoon


j1,j2,j3= jets in lab frame, MET=missing transverse
mj1,mj2 = megajets in R-frame (p1=p2)
q1,q2 (red) = squarks generator level at the R-frame
q1,q2 (blue) = squarks generator level at their CM frame

Figures

Figure 1

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Figure 2




Figure 3

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Figure 4

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Figure 5

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The likelihood




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Figure 8

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Figure 9

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p-value summary for 21 signal regions




Figure 10




Example hypothesis test for model dependent limit







Table 1 (Systematics)




Figure 11: Total expected/observed, HAD-only observed, Leptons-combined observed





Total expected/observed






Total expected/observed, HAD-only observed






Topic attachments
I Attachment History Action Size Date Who Comment
PDFpdf Figure1_LM6.pdf r1 manage 64.0 K 2011-11-11 - 16:38 MariaSpiropulu  
PDFpdf Figure1_QCD.pdf r1 manage 41.0 K 2011-11-11 - 16:38 MariaSpiropulu  
PDFpdf Figure1_TTbar.pdf r1 manage 34.9 K 2011-11-11 - 16:37 MariaSpiropulu  
PDFpdf Figure1_VB.pdf r1 manage 31.8 K 2011-11-11 - 16:37 MariaSpiropulu  
PDFpdf MC-mu0btag-MRslopes.pdf r1 manage 33.4 K 2011-11-11 - 16:47 MariaSpiropulu  
PDFpdf MC-mu0btag-Rslopes.pdf r1 manage 31.3 K 2011-11-11 - 16:46 MariaSpiropulu  
PDFpdf MC-mu0btag-slopee1MR.pdf r1 manage 14.8 K 2011-11-11 - 16:46 MariaSpiropulu  
PDFpdf MC-mu0btag-slopee1R.pdf r1 manage 14.6 K 2011-11-11 - 16:41 MariaSpiropulu  
PDFpdf MC-mu0btag-slopee2MR.pdf r1 manage 14.7 K 2011-11-11 - 16:41 MariaSpiropulu  
PDFpdf MC-mu0btag-slopee2R.pdf r1 manage 14.6 K 2011-11-11 - 16:41 MariaSpiropulu  
JPEGjpg TotExp.jpg r2 r1 manage 444.7 K 2011-11-17 - 21:26 MariaSpiropulu  
PDFpdf TotExp.pdf r2 r1 manage 21.9 K 2011-11-17 - 23:47 MariaSpiropulu  
JPEGjpg TotExp_Had.jpg r2 r1 manage 456.9 K 2011-11-17 - 21:27 MariaSpiropulu  
PDFpdf TotExp_Had.pdf r2 r1 manage 22.2 K 2011-11-17 - 23:48 MariaSpiropulu  
JPEGjpg TotExp_HadLept.jpg r2 r1 manage 481.2 K 2011-11-17 - 23:35 MariaSpiropulu  
PDFpdf TotExp_HadLept.pdf r6 r5 r4 r3 r2 manage 53.1 K 2011-11-17 - 23:46 MariaSpiropulu  
PDFpdf YiMRslopes-PAS.pdf r1 manage 39.0 K 2011-11-11 - 16:40 MariaSpiropulu  
PDFpdf YiRslopes-PAS.pdf r1 manage 25.3 K 2011-11-11 - 16:40 MariaSpiropulu  
PDFpdf YislopeMR-PAS.pdf r1 manage 14.8 K 2011-11-11 - 16:40 MariaSpiropulu  
PDFpdf YislopeR-PAS.pdf r1 manage 14.8 K 2011-11-11 - 16:39 MariaSpiropulu  
Unknown file formatext caption-had-tot r1 manage 102.5 K 2011-11-11 - 15:47 MariaSpiropulu  
Unknown file formatext caption-had-tot-lep r4 r3 r2 r1 manage 130.9 K 2011-11-11 - 19:01 MariaSpiropulu  
JPEGjpg cartoon.jpg r1 manage 69.5 K 2011-11-11 - 15:51 MariaSpiropulu  
JPEGjpg combine-boxes.jpg r1 manage 753.8 K 2011-11-17 - 23:11 MariaSpiropulu  
PDFpdf combine-boxes.pdf r2 r1 manage 277.1 K 2011-11-17 - 23:11 MariaSpiropulu  
PNGpng combine-boxes.png r1 manage 201.0 K 2011-11-11 - 15:54 MariaSpiropulu  
PDFpdf data-mu0btag-MRslopes.pdf r1 manage 29.8 K 2011-11-11 - 16:51 MariaSpiropulu  
PDFpdf data-mu0btag-Rslopes.pdf r1 manage 27.2 K 2011-11-11 - 16:51 MariaSpiropulu  
PDFpdf data-mu0btag-slopee1MR.pdf r1 manage 14.8 K 2011-11-11 - 16:50 MariaSpiropulu  
PDFpdf data-mu0btag-slopee1R.pdf r1 manage 14.7 K 2011-11-11 - 16:44 MariaSpiropulu  
PDFpdf data-mu0btag-slopee2MR.pdf r1 manage 14.9 K 2011-11-11 - 16:44 MariaSpiropulu  
PDFpdf data-mu0btag-slopee2R.pdf r1 manage 14.6 K 2011-11-11 - 16:49 MariaSpiropulu  
PDFpdf ele-MR.pdf r1 manage 16.8 K 2011-11-11 - 16:34 MariaSpiropulu  
PDFpdf ele-Rsq.pdf r1 manage 16.8 K 2011-11-11 - 16:49 MariaSpiropulu  
PDFpdf eleele-MR.pdf r1 manage 15.4 K 2011-11-11 - 16:33 MariaSpiropulu  
PDFpdf eleele-Rsq.pdf r1 manage 15.9 K 2011-11-11 - 16:33 MariaSpiropulu  
JPEGjpg examplelogQ.jpg r1 manage 638.6 K 2011-11-17 - 22:59 MariaSpiropulu  
PDFpdf examplelogQ.pdf r2 r1 manage 202.2 K 2011-11-17 - 22:59 MariaSpiropulu  
PNGpng examplelogQ.png r1 manage 242.0 K 2011-11-11 - 15:56 MariaSpiropulu  
Unknown file formatext explain-had-tot r3 r2 r1 manage 103.7 K 2011-11-11 - 18:17 MariaSpiropulu  
PNGpng fig1.png r2 r1 manage 366.0 K 2011-11-17 - 21:17 MariaSpiropulu  
PDFpdf fig10.pdf r1 manage 326.3 K 2011-11-11 - 15:54 MariaSpiropulu  
PNGpng fig10.png r2 r1 manage 76.6 K 2011-11-17 - 21:12 MariaSpiropulu  
PNGpng fig2.png r2 r1 manage 69.9 K 2011-11-17 - 21:17 MariaSpiropulu  
PNGpng fig3.png r2 r1 manage 187.0 K 2011-11-17 - 21:17 MariaSpiropulu  
PNGpng fig4.png r2 r1 manage 192.5 K 2011-11-17 - 21:16 MariaSpiropulu  
PNGpng fig5.png r2 r1 manage 181.4 K 2011-11-17 - 21:16 MariaSpiropulu  
PNGpng fig6.png r2 r1 manage 155.9 K 2011-11-17 - 21:16 MariaSpiropulu  
PNGpng fig7.png r2 r1 manage 164.9 K 2011-11-17 - 21:15 MariaSpiropulu  
PNGpng fig8.png r2 r1 manage 125.2 K 2011-11-17 - 21:15 MariaSpiropulu  
PNGpng fig9.png r2 r1 manage 127.0 K 2011-11-17 - 21:13 MariaSpiropulu  
PDFpdf had-MR.pdf r1 manage 17.4 K 2011-11-11 - 16:31 MariaSpiropulu  
PDFpdf had-Rsq.pdf r1 manage 16.9 K 2011-11-11 - 16:31 MariaSpiropulu  
PNGpng likelihood.png r1 manage 197.4 K 2011-11-11 - 16:10 MariaSpiropulu  
Unknown file formatext limit-caption r1 manage 95.3 K 2011-11-11 - 15:47 MariaSpiropulu  
Unknown file formatext limit-explain r1 manage 182.1 K 2011-11-11 - 15:48 MariaSpiropulu  
PDFpdf mu-MR.pdf r1 manage 16.5 K 2011-11-11 - 16:53 MariaSpiropulu  
PDFpdf mu-Rsq.pdf r1 manage 16.9 K 2011-11-11 - 16:54 MariaSpiropulu  
PDFpdf muele-MR.pdf r1 manage 14.9 K 2011-11-11 - 16:30 MariaSpiropulu  
PDFpdf muele-Rsq.pdf r1 manage 15.7 K 2011-11-11 - 16:29 MariaSpiropulu  
PDFpdf mumu-MR.pdf r1 manage 16.2 K 2011-11-11 - 16:29 MariaSpiropulu  
PDFpdf mumu-Rsq.pdf r1 manage 16.5 K 2011-11-11 - 16:29 MariaSpiropulu  
PDFpdf p-ele.pdf r1 manage 14.8 K 2011-11-11 - 16:35 MariaSpiropulu  
PDFpdf p-eleele.pdf r1 manage 14.9 K 2011-11-11 - 16:16 MariaSpiropulu  
PDFpdf p-had.pdf r1 manage 14.8 K 2011-11-11 - 16:32 MariaSpiropulu  
PDFpdf p-mu.pdf r1 manage 14.8 K 2011-11-11 - 15:58 MariaSpiropulu  
PDFpdf p-muele.pdf r1 manage 14.9 K 2011-11-11 - 15:58 MariaSpiropulu  
PDFpdf p-mumu.pdf r1 manage 14.9 K 2011-11-11 - 15:57 MariaSpiropulu  
JPEGjpg pvalue-summary.jpg r1 manage 596.0 K 2011-11-17 - 23:18 MariaSpiropulu  
PDFpdf pvalue-summary.pdf r2 r1 manage 45.2 K 2011-11-17 - 23:18 MariaSpiropulu  
PNGpng pvalue-summary.png r1 manage 127.3 K 2011-11-11 - 15:56 MariaSpiropulu  
PDFpdf raz-selection.pdf r1 manage 82.8 K 2011-11-11 - 16:39 MariaSpiropulu  
PDFpdf tab1.pdf r1 manage 55.2 K 2011-11-11 - 16:02 MariaSpiropulu  
PNGpng tab1.png r2 r1 manage 51.3 K 2011-11-17 - 21:15 MariaSpiropulu  
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Topic revision: r6 - 2011-12-05 - MariaSpiropulu
 
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