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:

Code

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)
img343f65dd6f53937e6d6be5b9107ccb9c.png
without Jet cleaning
img10391876c451f2123b6c1c95416ded1a.png
with Jet cleaning

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
img4689e38c6d98daade6d76e2254a30abd.png
sample with L2+L3 correction
img55d08ce2b1985be8c0944df0f0abfc61.png
original sample
  • 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
img70ac7cc9116c69d781fe457d8f007da3.png
ΔR = 0.3 CaloJet
img275bf5a0ceff4ca9715f6f0f0cbc780b.png
ΔR = 0.4 CaloJet and L2+L3 correction

Mjj analyzer

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

Mj analyzer

  • 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
img44f539509e7679fefb181d5401743ab2.png
max ΔR 0.3
img7af2658aee332da3f36e4972443778ea.png
max ΔR 0.4 + JetCleaner

Jet Energy corrections

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

Topic attachments
I Attachment History Action Size Date Who Comment
PNGpng H160WW2l_genJetPt.png r1 manage 12.7 K 2009-02-20 - 12:24 AndreaMassironi Pt of GenJets
PNGpng H160WW2l_ratioRecoGenJetPtTag.png r1 manage 12.4 K 2009-02-20 - 13:14 AndreaMassironi  
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Topic revision: r28 - 2009-03-23 - AndreaMassironi
 
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