Jet Tagging studies for VBF Higgs -> WW -> 2l2nu

What

Creation of a TTree to store everything needed to study Jet tagging efficiencies and performance. What inside:

• GenJet
• GenMet
• ...

Code

• Tree producer
  • information
    • information about TParticle
    • information about JetMetCorrector
    • infromation about JPT Jet Plus Tracks Algorithm and instructions for CMSSW_2_2_3
    • information about SisCone Jets
  • config file
  • cmsRun file python
• Old code
• Neural Network approach on single jet NNVBFJetTagger
• TMVA analysis for jet tagging
• After jetTagging use Event Selector to select events with minPT , minΔη , minMjj
  • plugin.h and plugin.cc

Results

• 856M for all the sample H160_WW_2l : 130300 events -> stored /castor/cern.ch/user/a/amassiro/VBF/SimpleTree/VBF_SimpleTree_H160_WW_2l.root

Tagging

Tagging Quark and GenJet

• tagging between quark and genJet. Distribution of jets ΔR minimum distance between Jets and tag quarks if both quarks are tagged with different GenJets . Cut value chosen ΔR = 0.3

• tagging between quark and genJet. Efficiency of ΔR selection. Efficiency = number of events with ΔR < x / total number of VBF events

Tagging GenJet and RecoJet

• tagging between genJet (ΔR = 0.3 with tag quarks) and recoJet . Distribution of jets ΔR minimum distance between recoJets and genJets. Cut value chosen ΔR = 0.3

• tagging between genJet (ΔR = 0.3 with tag quarks) and recoJet . Efficiency of ΔR selection. Efficiency = number of events with ΔR < x / total number of VBF events

Tagging Quark and RecoJet

• tagging between recoJet and Quarks . Efficiency of ΔR selection. Efficiency = number of events with ΔR < x / total number of VBF events

Tagging Quark-GenJet and Quark-RecoJet comparison

• tagging between genJet and Quark versus recoJet and Quark . Distribution of jets ΔR minimum distance.

Tagging Quark-GenJet-RecoJet and Quark-RecoJet comparison

• tagging between RecoJet-(genJet)-Quark versus RecoJet-Quark . Distribution of jets ΔR minimum distance.

Number of RecoJets analyzer

• Number of RecoJets (in any η region) in a VBF event (pythia 123 || 124)

Pt analyzer

• MC matching genParticles (quarks that produced Higgs) and genJet ΔR = 0.3: normalized distribution of pT of the taggedGenJet and Pt of all the genJets

• Distribution of pT of reco jets for tagged (Quark-Gen-Reco) and all jets

• From a VBF sample, for each event I get one RecoJet, chosen using a random generator. A recoJet is tagged if ΔR Reco-(Gen)-Quark < 0.4. Distribution of pT of reco jets for tagged (Quark-Gen-Reco) and not tagged jets. Pt distribution and after L2+L3 correction
• Ratio between pT of reco Jets and genJets

Mjj analyzer

• Mjj distribution of GenJets and TaggedGenJets ΔR = 0.3 (normalized distribution)

• Mjj distribution of recoJets and TaggedRecoJets ΔR = 0.3 (normalized distribution)

Mj analyzer

• Mj distribution of GenJets and TaggedGenJets ΔR = 0.3 (normalized distribution)

• Mj distribution of recoJets and TaggedRecoJets ΔR = 0.3 (normalized distribution)

Purity

• purity of recoJets with the two methods maxMjj and maxPt. Both quark matched. No geometrical/energetic selection applied

Jet Energy corrections

• VBFWWL2L3

η analyzer

• η distribution of tagged GenJets ΔR = 0.3

• η distribution of tagged GenJets ΔR = 0.3 2D: first and second jetTag (first = index quark 6, second = index quark 7) -> sign( η 1 x η 2 ) = -1. Region IV / All = 18849 / 21613 ~ 87%

Quark distribution by Valentina VBF blog -> post -> graph

• η distribution of tagged GenJets ΔR = 0.3 and all jets in a VBF H WW 2l sample

• Δ η distribution of tagged GenJets and tagged recoJets

• Zeppenfeld variable z_i = η_i + (η_1 + η_2 ) / 2 distribution of tagged GenJets and tagged recoJets

• From a VBF sample, for each event I get one pair of RecoJets, chosen using a random generator. A pair of recoJets is tagged if both recoJets are tagged, that is if ΔR Reco-(Gen)-Quark < 0.4. Distribution of ΔR between reco jets for tagged (Quark-Gen-Reco) and not tagged jets. Image

-- AndreaMassironi - 20 Feb 2009