Recommendations for Systematic Uncertainties HL-LHC (3 fb-1)

Material and Links

Perspectives on the determination of systematic uncertainties at HL-LHC, S.P. Griso, M. Narain, HL/HE-LHC workshop, June 19, 2018

Recommended Systematics

Object Efficiency uncertainty Recommendation Links
Muons muon reco+ID (all WP) 0.1% .
muon reco+ID+isolation (all WP) 0.5%  
Electrons/photons electron reco=ID (incl. isolation), all WP (pt > 20 GeV) 0.5%  
photon reco+ID+incl. isolation) ~2% (?) Specific to CMS H->gg: worsening to 75% of the current vertex finding efficiency (includes gain from MTD)
tau tau reco+ID+isolation (all WP) 5% as in Run2  
  recommend 2.5% for analyses where tau efficiency is one of the diominant uncertainties  
flavor tagging b-jets (all working points) ~ 1% for 30<pt<300 GeV, 2--6% for pt>300 GeV ROOT file with uncertainties Phase2_syst_PRELIM.png
    ROOT file w/ Phase2CommonoverRun2CMS for CMS projections Phase2overRun2_statANDsyst_PRELIM.png
c-jets (all working points) ~2%  
light jets (loose WP) 5%  
light jets (medium WP) 10%  
light jets (tight WP) 15%  
subjet b-tagging    
double-b tag  
Jets JES    
abs. scale 0.1-0.2%  
rel. scale 0.1-0.5%  
Pile up 0-2%  
Jet Flavour 0.75%  
JER    
Jet substructure Jet mass scale uncertainty 1%  
Jet mass resolution 10%  
W tagging efficiency 10% (governed by Herwig vs Pythia)  
Integrated luminosity   1%

Modeling Uncertainties:

  • Renormalization and factorization scales (includes ME and PS): factor 1/2 (improve with more data and more studies)
  • Top pt: factor 1/3 or even less (more differential cross sections, NLO generators, 2D-differential NNLO predictions used for differential k-factors.)
  • PDF:
  • MC statistics: no uncertainty

-- MeenakshiNarain - 2018-06-22

Topic attachments
I Attachment History Action Size Date Who Comment
PNGpng Phase2_syst_PRELIM.png r1 manage 92.7 K 2018-06-23 - 14:53 MeenakshiNarain flavour tagging systematics
Unknown file formatroot Phase2_syst_PRELIM.root r1 manage 27.0 K 2018-06-23 - 14:53 MeenakshiNarain flavour tagging systematics
PNGpng Phase2overRun2_statANDsyst_PRELIM.png r1 manage 96.6 K 2018-06-23 - 14:53 MeenakshiNarain flavour tagging systematics
Unknown file formatroot Phase2overRun2_statANDsyst_PRELIM.root r1 manage 27.0 K 2018-06-23 - 14:53 MeenakshiNarain flavour tagging systematics
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Topic revision: r5 - 2018-08-29 - MariaCepeda
 
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