JetID CAFe HowTo

What the user has to decide?

• Period of data used as input to JetID SF measurement: p20 pre/post shutdown, or p17. This is determined by a subdirectory name, as in the example config below.
• The eta binnning: coarse (0.4) or fine (0.1 -- recommended). Fine binning efficiency names include the suffix _finedeta.
• If one runs JetCorr and JetRemoval on MC before JSSR, one should not use the EffName with SSR.
• IMPORTANT: so far, spc files were derived separately for p20 pre- and post-shutdown data. Most of the statistics is in pre-shutdown (Nov2007). So the recommendation is to use pre-shutdown spc files for analyses running over full p20 data. We are currently re-deriving spc files for the whole p20 dataset, but this will be only an addition of about 0.6M events to 3.2M pre-shutdown ones.
  We have already prepared the directory with full p20 spc files, which for the moment contains a copy of p20 pre-shutdown spc files (with a change in triglist version).
• So, for example:
  RECOMMENDED: If runnning over full p20 data with MC after JSSR, use
  jet_correction.EffName: MCJetIDScaleSSR_finedeta
  jet_correction.Path: jetid_eff/jetid/p20_all/
  jet_correction.TriggerVersion: v15-v16
  If runnning e.g. on p20 postshutdown of the 'Ichep 2008' definition using MC after JSSR, use
  jet_correction.EffName: MCJetIDScaleSSR_finedeta
  jet_correction.Path: jetid_eff/jetid/p20_Ichep2008/
  jet_correction.TriggerVersion: v15-v16
  If you want to use explicite p20 preshutdown spc's without running SSR in MC, use preferrebly fine eta binning via
  jet_correction.EffName: MCJetIDScale_finedeta
  jet_correction.Path: jetid_eff/jetid/p20_pre/
  jet_correction.TriggerVersion: v15
  If you want to run e.g. on prelim p20 postshutdown data (based on CSG_CAF_QCD_PASS4_p21.08.00 only) after JSSR in MC, use
  jet_correction.EffName: MCJetIDScaleSSR_finedeta
  jet_correction.Path: jetid_eff/jetid/p20_post/
  jet_correction.TriggerVersion: v15

This is an example (from V+Jets central config) of a config file to remove from MC good jets based on Data/MC JetID Eff Scale Factors.

• The spc files are stored in package jetid_eff in directories in jetid_eff/jetid/. The p20 Ichep2008 spc files are in tag v02-00-05 and were derived using CSG_CAF_QCD_PASS4_p21.08.00 (which is only d0reco p20.12.00) CSG_CAF_QCD_PASS4_p21.10.00_p20.12.01 CSG_CAF_QCD_PASS4_p21.10.00_p20.12.02_summer2008 . Previous p17-only spc files are tagged as v01-01-06). p20 pre and post (both prelim and Ichep2008 set) shutdown as well as old p17 spc files are also available in the new tag in corresponding subdirectories.
• JetID plateau Data/MC SF spc files are being used by the caf_eff_utils::JetCorr (computes an event weight using JetID Data/MC SF) and caf_mc_util::JetRemoval (removes jets based on the weight).
• An example analysis config, using vjets_cafe example, can look like the following:

   
  
  +cafe.Run:	JetCorr(jet_correction)
  +cafe.Run:	JetRemoval(jet_removal)
  
  jet_correction.From:                GoodJCCB
  jet_correction.ApplyToGlobalWeight: false
  
  
  
  # all p20 data
  jet_correction.Path:                jetid_eff/jetid/p20_all/
  jet_correction.TriggerVersion:      v15-v16
  
  
  
  
  # p20 Ichep2008
  # jet_correction.Path:                jetid_eff/jetid/p20_Ichep2008/
  # jet_correction.TriggerVersion:      v15-v16
  
  
  
  # p20 preshutdown
  # jet_correction.Path:                jetid_eff/jetid/p20_pre/
  # jet_correction.TriggerVersion:      v15
  
  
  
  # p20 postshutdown
  # jet_correction.Path:                jetid_eff/jetid/p20_post/
  # jet_correction.TriggerVersion:      v15
  
  
  
  # p17
  # jet_correction.Path:                jetid_eff/jetid/p17/
  # jet_correction.TriggerVersion:      v8-v14
  
  
  jet_correction.EffName:             MCJetIDScaleSSR_finedeta
  jet_correction.EffType:             Binned
  jet_correction.EffMethod:           TagAndProbe
  jet_correction.EffVarNames:         deta pt
  jet_correction.EffVersion:          1
  jet_correction.ObjQuality:          Standard
  jet_correction.ObjType:             Jet
  
  jet_removal.JetCorr: jet_correction
  jet_removal.From:    GoodJCCB
  jet_removal.To:      YourAnalysisJCCB
  jet_removal.Tree:    ElmTree