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

Link to documentation in CDS

Abstract

A search is performed for heavy particle pairs produced in √s = 7 TeV proton-proton collisions with 4.4 fb−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

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The likelihood




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Example hypothesis test for model dependent limit







Table 1 (Systematics)




In the limits below theory uncertainties are factorized: the results are calculated with experimental uncertainties only and shown for values of NLO+NLL cross-sections with ±1σ variation based on PDF and scale uncertainties determined according to the PDF4LHC recommendations.

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SMS Interpretation

T1 - Di-gluino production resulting in 4 jets + MET final states


Interpretation of inclusive razor analysis in T1 SMS models. Color-scale (z-axis) indicates the observed cross-section upper limit for each model point, as a function of gluino and LSP mass. Solid black line indicates observed exclusion region, assuming nominal NLO+NLL di-gluino production cross section. Dotted black lines show observed exclusion taking +- 1 sigma theory errors around nominal cross section. Solid green line indicates median expected exclusion region, with dotted green lines indicating the expected exclusion with +- 1 sigma experimental uncertainties. The solid grey region indicates model points where the analysis was found to have dependence on ISR modeling in simulation of signal events above a pre-defined tolerance; no interpretation is presented for these model points. pdf ROOT file
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Efficiency of all signal regions for T1 SMS models, as a function of gluino and LSP mass. ROOT file

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(left) MR distribution (center) R squared distribution (right) 2D MR vs. R squared distribution for sample T1 SMS models. The orange lines indicate approximate SM background iso-yield contours, with numbers indicating the yield, relative to the line marked '1'

T2 - Di-squark production resulting in 2 jets + MET final states


Interpretation of inclusive razor analysis in T2 SMS models. Color-scale (z-axis) indicates the observed cross-section upper limit for each model point, as a function of squark and LSP mass. Solid black line indicates observed exclusion region, assuming nominal NLO+NLL di-squark production cross section. Dotted black lines show observed exclusion taking +- 1 sigma theory errors around nominal cross section. Solid green line indicates median expected exclusion region, with dotted green lines indicating the expected exclusion with +- 1 sigma experimental uncertainties. The solid grey region indicates model points where the analysis was found to have dependence on ISR modeling in simulation of signal events above a pre-defined tolerance; no interpretation is presented for these model points. pdf ROOT file
pdf
Efficiency of all signal regions for T2 SMS models, as a function of squark and LSP mass. ROOT file

pdf pdf pdf
(left) MR distribution (center) R squared distribution (right) 2D MR vs. R squared distribution for sample T2 SMS models. The orange lines indicate approximate SM background iso-yield contours, with numbers indicating the yield, relative to the line marked '1'

T1tttt - Di-gluino production resulting in 4 top quarks + MET final states


Interpretation of inclusive razor analysis in T1tttt SMS models. Color-scale (z-axis) indicates the observed cross-section upper limit for each model point, as a function of gluino and LSP mass. Solid black line indicates observed exclusion region, assuming nominal NLO+NLL di-gluino production cross section. Dotted black lines show observed exclusion taking +- 1 sigma theory errors around nominal cross section. Solid green line indicates median expected exclusion region, with dotted green lines indicating the expected exclusion with +- 1 sigma experimental uncertainties. pdf ROOT file
pdf pdf pdf
pdf pdf pdf
Efficiencies of signal regions for T1tttt SMS models, for different lepton-ID-based final states, as a function of gluino and LSP mass. ROOT file

T2tt - Di-stop production resulting in 2 top quarks + MET final states


Interpretation of inclusive razor analysis in T2tt SMS models. Color-scale (z-axis) indicates the observed cross-section upper limit for each model point, as a function of stop and LSP mass. Solid black line indicates observed exclusion region, assuming nominal NLO+NLL di-stop production cross section. Dotted black lines show same exclusion taking +- 1 sigma theory errors around nominal cross section. Solid green line indicates median expected exclusion region, with dotted green lines indicating the expected exclusion with +- 1 sigma experimental uncertainties. The solid grey region indicates model points where the analysis was found to have dependence on ISR modeling in simulation of signal events above a pre-defined tolerance; no interpretation is presented for these model points. pdf ROOT file
pdf pdf pdf
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Efficiencies of signal regions for T2tt SMS models, for different lepton-ID-based final states, as a function of stop and LSP mass. ROOT file

-- MariaSpiropulu - 06-Mar-2012

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PNGpng tbl1.png r3 r2 r1 manage 48.6 K 2012-03-07 - 03:55 MariaSpiropulu  
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