Inclusive SUSY Reach of CMS during Early LHC Running in the Jets + MET + N Leptons topology. Bobby Scurlock Darin Acosta Richard Cavanaugh. University of Florida. Overview. Motivation Phase 1 : Prelude Establish “full-chain” Verify CMS Note 98-073 with “full-chain”
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Inclusive SUSY Reach of CMS during Early LHC Running in the Jets + MET + N Leptons topology
University of Florida
Abdullin & Charles (CMS Note 98-073)
Gives idea of Level-1 Trigger and HLT requirements for good efficiency for SUSY events over several representative points in mSUGRA space
…we assume a well understood detector?
…we assume, e.g., that calorimeter responses are not well understood?
Abdullin & Charles
(CMS Note 98-073)
Establish “full-chain” analysis
Defining our own currently
Investigating JetMET ntuple
Run on Digis (baseline)
Run on DSTs (when stable)
“Full-chain” important for systematic studies !
Modify physics process
Perturb detector response
MCinfo,G4 Vtx, Tk
Analysis or Calibration
Need more signal !
Z+jets lagging a bit !
Need inclusive TTbar !
Need more high PT QCD !
Location of inclusive
WW, ZW ?
N = (εSσS + εBσB) L
Estimate uncertainties in cross-section σB
Treat QCD differently from EW
Guess at uncertainties in Luminosity L
Estimate uncertainties in efficiencies εS , εB
Examine uncertainties on backgrounds in control regions
Likelihood for SUSY Signal hypothesis, given Experimental Data and assuming knowledge of Standard Model Background
Systematic Gaussian PDFs
Statistical Poisson PDF
Potentially very useful for:
mSUGRA parameter sweeps
Estimates of systematic effects which are otherwise to costly
Investigate Distributions of Physics Objects:
ET of leading jet, ET of next leading jet, MET of event, Jet multiplicity, etc…
PT of leading muon, PT of next leading muon, Muon isolation, etc…
ET of leading electron, ET of next leading electron, Electron isolation, etc...