inclusive susy reach of cms during early lhc running in the jets + met + n leptons topology
DESCRIPTION
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” - PowerPoint PPT PresentationTRANSCRIPT
SUSY/BSM Review, 9/20/2004. B. Scurlock, University of Florida 1
Bobby Scurlock
Darin Acosta
Richard Cavanaugh
Inclusive SUSY Reach of CMS during Early LHC Running in the Jets + MET + N Leptons topology
Inclusive SUSY Reach of CMS during Early LHC Running in the Jets + MET + N Leptons topology
University of Florida
SUSY/BSM Review, 9/20/2004. B. Scurlock, University of Florida 2
OverviewOverview
• Motivation• Phase 1 : Prelude
– Establish “full-chain”– Verify CMS Note 98-073 with “full-chain”
• Phase 2 : Main emphasis– Study systematic effects on reach– Establish reach scenarios
• Phase 3 – Write contributions for Physics TDR– Defend PhD !
• Motivation• Phase 1 : Prelude
– Establish “full-chain”– Verify CMS Note 98-073 with “full-chain”
• Phase 2 : Main emphasis– Study systematic effects on reach– Establish reach scenarios
• Phase 3 – Write contributions for Physics TDR– Defend PhD !
SUSY/BSM Review, 9/20/2004. B. Scurlock, University of Florida 3
Our InterestOur Interest
• Extend earlier Florida JetMET BSM analysis efforts from CDF to CMS
• Collaborate with other CMS members:– Florida Colleagues on SS 2μ Inclusive SUSY Reach Analysis:
• A.Drozdetski, Y.Pakhotin, P.Bartalini, D.Acosta, G.Mitselmakher– JetMET Group:
• Haifeng Pi, Arno Heister, Rob Harris, et al. – UF SUSY/BSM Theorists:
• P. Ramond, R. Field, and K. Matchev
• Focus on early (~10 fb-1) LHC physics – Establish realistic reach expectations
• Study systematic effects• Consider “What if…” scenarios
– Probe quasi-model-independent reaches
• Extend earlier Florida JetMET BSM analysis efforts from CDF to CMS
• Collaborate with other CMS members:– Florida Colleagues on SS 2μ Inclusive SUSY Reach Analysis:
• A.Drozdetski, Y.Pakhotin, P.Bartalini, D.Acosta, G.Mitselmakher– JetMET Group:
• Haifeng Pi, Arno Heister, Rob Harris, et al. – UF SUSY/BSM Theorists:
• P. Ramond, R. Field, and K. Matchev
• Focus on early (~10 fb-1) LHC physics – Establish realistic reach expectations
• Study systematic effects• Consider “What if…” scenarios
– Probe quasi-model-independent reaches
SUSY/BSM Review, 9/20/2004. B. Scurlock, University of Florida 4
Earlier CMS WorkEarlier CMS WorkAbdullin & Charles (CMS Note 98-073)• Used Fast Sim. (CMSJET) of CMS detector• Established reasonable criteria for signal selection
& background rejection, and sensible expectations for signal & background distributions
• Studied some simple systematics– Signal & Background variations– Pile-up effects
• QCD background was (remains) a serious challenge
DAQ TDR
Gives idea of Level-1 Trigger and HLT requirements for good efficiency for SUSY events over several representative points in mSUGRA space
SUSY/BSM Review, 9/20/2004. B. Scurlock, University of Florida 5
What if…What if…
Abdullin & Charles (CMS Note 98-073)
…we assume, e.g., that calorimeter responses are not well understood?– Would n muons + Jets + MET
be more significant?– If so, at what level of jet energy
scale uncertainty?
…we assume, e.g., that calorimeter responses are not well understood?– Would n muons + Jets + MET
be more significant?– If so, at what level of jet energy
scale uncertainty?
…we assume a well understood detector?– 0 leptons + Jets +
MET has most significant reach
…we assume a well understood detector?– 0 leptons + Jets +
MET has most significant reach
SUSY/BSM Review, 9/20/2004. B. Scurlock, University of Florida 6
Phase 1 : Analysis set-upPhase 1 : Analysis set-up
• Establish “full-chain” analysis– CMKIN 3+– OSCAR 3+– ORCA 8+
• Develop RootMaker– 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– Change reconstruction
• Establish “full-chain” analysis– CMKIN 3+– OSCAR 3+– ORCA 8+
• Develop RootMaker– 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– Change reconstruction
OSCAR
HEPEVTNtuple
ORCA
minbias
signal
Digis,Assocs
DST
SimReader RecReader
MC generator
CMKIN
Production
Production User
Generation Simulation
Digitization Reconstruction
MCinfo,G4 Vtx, Tk
SimHits
Analysis or Calibration
RecCollections Histo/Tree
RecColl, Digis
Digis
RecColl, Digis
Stream
Histo/TreeHisto/Tree
Histo/Tree
RecReader
RootMaker
Tree
SUSY/BSM Review, 9/20/2004. B. Scurlock, University of Florida 7
Phase 1 : Digi Datasets - SignalPhase 1 : Digi Datasets - SignalProcess Dataset Name Requested Produced LocationmSUGRA su03_msugra_lm1 0 0 ?
su03_msugra_lm2 0 0 ?su03_msugra_lm3 0 0 ?su03_msugra_lm4 100000 0 ?su03_msugra_lm5 100000 99995 CERNsu03_msugra_lm6 0 0 ?
Process Dataset Name Requested Produced LocationmSUGRA su03_msugra_lm1 0 0 ?
su03_msugra_lm2 0 0 ?su03_msugra_lm3 0 0 ?su03_msugra_lm4 100000 0 ?su03_msugra_lm5 100000 99995 CERNsu03_msugra_lm6 0 0 ?
Need more signal !Need more signal !
SUSY/BSM Review, 9/20/2004. B. Scurlock, University of Florida 8
Phase-1 : Digi Datasets – EW BackgroundPhase-1 : Digi Datasets – EW Background
Process Dataset Name Requested Produced LocationW+jets jm03b_Wjets_0_20 400000 303985 FNAL
jm03b_Wjets_20_50 600000 529983 FNALjm03b_Wjets_50_85 800000 736965 CERNjm03b_Wjets_85_150 600000 568974 FNALjm03b_Wjets_150_250 300000 279985 FNALjm03b_Wjets_250_400 200000 181988 CERNjm03b_Wjets_400_700 100000 97998 CERNjm03b_Wjets_700_1100 80000 79999 in progressjm03b_Wjets_1100_1600 50000 43999 in progressjm03b_Wjets_1600_2200 20000 17998 in progress
Z+jets jm03b_Zjets_0_20 200000 197996 FNALjm03b_Zjets_20_50 300000 279986 FNALjm03b_Zjets_50_85 400000 377979 FNALjm03b_Zjets_85_150 300000 224993 donejm03b_Zjets_150_250 150000 149996 in progressjm03b_Zjets_250_400 100000 0 in progressjm03b_Zjets_400_700 50000 0 in progressjm03b_Zjets_700_1100 40000 0 in progressjm03b_Zjets_1100_1600 20000 14000 in progressjm03b_Zjets_1600_2200 10000 10000 done
Process Dataset Name Requested Produced LocationW+jets jm03b_Wjets_0_20 400000 303985 FNAL
jm03b_Wjets_20_50 600000 529983 FNALjm03b_Wjets_50_85 800000 736965 CERNjm03b_Wjets_85_150 600000 568974 FNALjm03b_Wjets_150_250 300000 279985 FNALjm03b_Wjets_250_400 200000 181988 CERNjm03b_Wjets_400_700 100000 97998 CERNjm03b_Wjets_700_1100 80000 79999 in progressjm03b_Wjets_1100_1600 50000 43999 in progressjm03b_Wjets_1600_2200 20000 17998 in progress
Z+jets jm03b_Zjets_0_20 200000 197996 FNALjm03b_Zjets_20_50 300000 279986 FNALjm03b_Zjets_50_85 400000 377979 FNALjm03b_Zjets_85_150 300000 224993 donejm03b_Zjets_150_250 150000 149996 in progressjm03b_Zjets_250_400 100000 0 in progressjm03b_Zjets_400_700 50000 0 in progressjm03b_Zjets_700_1100 40000 0 in progressjm03b_Zjets_1100_1600 20000 14000 in progressjm03b_Zjets_1600_2200 10000 10000 done
Z+jets lagging a
bit !Z+jets lagging a
bit !
SUSY/BSM Review, 9/20/2004. B. Scurlock, University of Florida 9
Phase-1 : Digi Datasets – QCD BackgroundPhase-1 : Digi Datasets – QCD Background
Process Dataset Name Requested Produced LocationTTbar jm03b_TTbar_inclusive 3500000 499963 in progress
jm03b_TTbar_leptonic 1000000 947960 CERNqcd 2 to 2 jm03b_qcd_0_15 30000 24999 FNAL
jm03b_qcd_15_20 50000 44999 FNALjm03b_qcd_20_30 100000 89999 FNALjm03b_qcd_30_50 100000 92997 FNALjm03b_qcd_50_80 200000 199993 FNALjm03b_qcd_80_120 300000 286987 FNALjm03b_qcd_120_170 300000 293982 FNALjm03b_qcd_170_230 400000 370977 FNALjm03b_qcd_230_300 500000 353982 FNALjm03b_qcd_300_380 300000 294984 in progressjm03b_qcd_380_470 200000 199989 in progressjm03b_qcd_470_600 200000 199987 CERNjm03b_qcd_600_800 100000 99996 in progressjm03b_qcd_800_1000 100000 98999 CERNjm03b_qcd_1000_1400 100000 95999 in progressjm03b_qcd_1400_1800 50000 0 in progressjm03b_qcd_1800_2200 50000 0 in progressjm03b_qcd_2200_2600 50000 0 in progressjm03b_qcd_2600_3000 50000 0 in progressjm03b_qcd_3000_3500 40000 0 in progressjm03b_qcd_3500_4000 40000 0 in progress
Process Dataset Name Requested Produced LocationTTbar jm03b_TTbar_inclusive 3500000 499963 in progress
jm03b_TTbar_leptonic 1000000 947960 CERNqcd 2 to 2 jm03b_qcd_0_15 30000 24999 FNAL
jm03b_qcd_15_20 50000 44999 FNALjm03b_qcd_20_30 100000 89999 FNALjm03b_qcd_30_50 100000 92997 FNALjm03b_qcd_50_80 200000 199993 FNALjm03b_qcd_80_120 300000 286987 FNALjm03b_qcd_120_170 300000 293982 FNALjm03b_qcd_170_230 400000 370977 FNALjm03b_qcd_230_300 500000 353982 FNALjm03b_qcd_300_380 300000 294984 in progressjm03b_qcd_380_470 200000 199989 in progressjm03b_qcd_470_600 200000 199987 CERNjm03b_qcd_600_800 100000 99996 in progressjm03b_qcd_800_1000 100000 98999 CERNjm03b_qcd_1000_1400 100000 95999 in progressjm03b_qcd_1400_1800 50000 0 in progressjm03b_qcd_1800_2200 50000 0 in progressjm03b_qcd_2200_2600 50000 0 in progressjm03b_qcd_2600_3000 50000 0 in progressjm03b_qcd_3000_3500 40000 0 in progressjm03b_qcd_3500_4000 40000 0 in progress
Need more high PT QCD !
Need more high PT QCD !
Need inclusive TTbar !
Need inclusive TTbar !
SUSY/BSM Review, 9/20/2004. B. Scurlock, University of Florida 10
Phase 1 : Digi Datasets - Higher order EW Background Phase 1 : Digi Datasets - Higher order EW Background
Process Dataset Name Requested Produced LocationWW+jets jm03b_WWjets_inclusive 500000 495000 done
jm03b_WWjets_leptonic 100000 99997 CERNZZ+jets jm03b_ZZjets_inclusive 500000 462000 FNAL
jm03b_ZZjets_leptonic 100000 99993 in progressZW+jets jm03b_ZWjets_inclusive 300000 279993 done
jm03b_ZWjets_leptonic 50000 49997 CERN
Process Dataset Name Requested Produced LocationWW+jets jm03b_WWjets_inclusive 500000 495000 done
jm03b_WWjets_leptonic 100000 99997 CERNZZ+jets jm03b_ZZjets_inclusive 500000 462000 FNAL
jm03b_ZZjets_leptonic 100000 99993 in progressZW+jets jm03b_ZWjets_inclusive 300000 279993 done
jm03b_ZWjets_leptonic 50000 49997 CERN
Location of inclusive
WW, ZW ?Location of inclusive
WW, ZW ?
SUSY/BSM Review, 9/20/2004. B. Scurlock, University of Florida 11
• Examine distributions after full simulation:
– Jet multiplicity, ET, ETMiss, Δφ(ET
jet1, ETMiss), etc…
• Examine distributions after full simulation:
– Jet multiplicity, ET, ETMiss, Δφ(ET
jet1, ETMiss), etc…
Phase 1 : Confirm Abdullin & CharlesPhase 1 : Confirm Abdullin & Charles
• Simple optimised cut set based on significance = Ns / √(Ns+Nb)– Try/use initial selection criteria from Abdullin & Charles
• Produce preliminary expected reach in m0 vs m1/2 plane– 10 fb-1
– 100 fb-1
• Ultimately, would like to limit number of cut sets used, by carving out regions in mSUGRA space rather than optimizing cuts for each particular point – this reduces systematics…
• Simple optimised cut set based on significance = Ns / √(Ns+Nb)– Try/use initial selection criteria from Abdullin & Charles
• Produce preliminary expected reach in m0 vs m1/2 plane– 10 fb-1
– 100 fb-1
• Ultimately, would like to limit number of cut sets used, by carving out regions in mSUGRA space rather than optimizing cuts for each particular point – this reduces systematics…
SUSY/BSM Review, 9/20/2004. B. Scurlock, University of Florida 12
Phase 2 : Systematics: The main emphasis of this workPhase 2 : Systematics: The main emphasis of this work
N = (εS σS + εB σB) L
• Estimate uncertainties in cross-section σB
– Treat QCD differently from EW– K-Factors
• Guess at uncertainties in Luminosity L• Estimate uncertainties in efficiencies εS , εB
– MC statistics– Detector Effects– Reconstruction Effects
• JetMET• Muon• Electron
– Theory
• Examine uncertainties on backgrounds in control regions
N = (εS σS + εB σB) L
• Estimate uncertainties in cross-section σB
– Treat QCD differently from EW– K-Factors
• Guess at uncertainties in Luminosity L• Estimate uncertainties in efficiencies εS , εB
– MC statistics– Detector Effects– Reconstruction Effects
• JetMET• Muon• Electron
– Theory
• Examine uncertainties on backgrounds in control regions
SUSY/BSM Review, 9/20/2004. B. Scurlock, University of Florida 13
Phase 2 : Systematics – TriggersPhase 2 : Systematics – Triggers
• Jet Corrections at L1?
• Trigger Efficiencies: – Jet+ET
Miss
– Muons– Electrons– Inclusive SUSY
• Jet Corrections at L1?
• Trigger Efficiencies: – Jet+ET
Miss
– Muons– Electrons– Inclusive SUSY
SUSY/BSM Review, 9/20/2004. B. Scurlock, University of Florida 14
Phase 2 : Systematics – Reconstruction of Physics ObjectsPhase 2 : Systematics – Reconstruction of Physics Objects
• Jets:– E/HCAL Calibration– Tracking Uncertainties– ET vs.
• ETMiss:
– Calibration – Fake Rates– Azimuthal Isolation
• Muons– B-Field – Detector Alignment– Brem
• Electrons– B-Field – ECAL Calibration– Brem
• Jets:– E/HCAL Calibration– Tracking Uncertainties– ET vs.
• ETMiss:
– Calibration – Fake Rates– Azimuthal Isolation
• Muons– B-Field – Detector Alignment– Brem
• Electrons– B-Field – ECAL Calibration– Brem
SUSY/BSM Review, 9/20/2004. B. Scurlock, University of Florida 15
• Estimate reach at 95% CL using likelihood
• Include systematic effects via convolution
• Estimate reach at 95% CL using likelihood
• Include systematic effects via convolution
Phase 2 : Significance EstimatorPhase 2 : Significance Estimator
Statistical Poisson PDF
Systematic Gaussian PDFs
Likelihood for SUSY Signal hypothesis, given Experimental Data and assuming knowledge of Standard Model Background
SUSY/BSM Review, 9/20/2004. B. Scurlock, University of Florida 16
Phase 2 : Quasi-model-independent studiesPhase 2 : Quasi-model-independent studies
• “What if…” mSUGRA is not the SUSY breaking model realised in Nature?
• Investigate more model independent approaches for setting reaches– Physical squark and gluino masses– Cross-section x BRs– Validate against several different SUSY
models at generator level
• “What if…” mSUGRA is not the SUSY breaking model realised in Nature?
• Investigate more model independent approaches for setting reaches– Physical squark and gluino masses– Cross-section x BRs– Validate against several different SUSY
models at generator level
SUSY/BSM Review, 9/20/2004. B. Scurlock, University of Florida 17
Phase 2 : FAMOSPhase 2 : FAMOS
• Potentially very useful for: – mSUGRA parameter sweeps– Estimates of systematic effects which are
otherwise to costly
• Investigate Distributions of Physics Objects:– JetMET:
• ET of leading jet, ET of next leading jet, MET of event, Jet multiplicity, etc…
– Muons:• PT of leading muon, PT of next leading muon, Muon
isolation, etc…
– Electron:• ET of leading electron, ET of next leading electron,
Electron isolation, etc...
• Potentially very useful for: – mSUGRA parameter sweeps– Estimates of systematic effects which are
otherwise to costly
• Investigate Distributions of Physics Objects:– JetMET:
• ET of leading jet, ET of next leading jet, MET of event, Jet multiplicity, etc…
– Muons:• PT of leading muon, PT of next leading muon, Muon
isolation, etc…
– Electron:• ET of leading electron, ET of next leading electron,
Electron isolation, etc...
SUSY/BSM Review, 9/20/2004. B. Scurlock, University of Florida 18
Synergy with Inclusive SS 2μ SUSY ReachSynergy with Inclusive SS 2μ SUSY Reach
• Authors:– Alexei Drozdetski (see today’s talk), Yuriy
Pakhotin, Paolo Bartalini, Darin Acosta, Guenakh Mitselmakher
• Many systematics are the same (or similar) for both analyses– Division of labor– Agree on a common Root Tree
• Etc…
• Authors:– Alexei Drozdetski (see today’s talk), Yuriy
Pakhotin, Paolo Bartalini, Darin Acosta, Guenakh Mitselmakher
• Many systematics are the same (or similar) for both analyses– Division of labor– Agree on a common Root Tree
• Etc…
SUSY/BSM Review, 9/20/2004. B. Scurlock, University of Florida 19
ConclusionsConclusions• Interested in conducting inclusive SUSY
search in the Jets + MET + Leptons topology to establish realistic reach expectations
• In process of mastering analysis chain and crating analysis tools
• Will conduct sanity checks against previous studies
• Consider various “What if …” scenarios, and systematic effects
• Would like to evolve to a model independent study
• Interested in conducting inclusive SUSY search in the Jets + MET + Leptons topology to establish realistic reach expectations
• In process of mastering analysis chain and crating analysis tools
• Will conduct sanity checks against previous studies
• Consider various “What if …” scenarios, and systematic effects
• Would like to evolve to a model independent study