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Alpgen MC Samples Jet Flavour Identifier Lepton ID Plots

Alpgen MC Samples Jet Flavour Identifier Lepton ID Plots. Alpgen Settings for CMS. Alpgen v2.05 CMS Default kinematic cuts in Alpgen Pt(l,c,b) > 20 GeV |eta (j,c,b)| < 5.0 |eta(e,mu,tau)| < 3.0 dR(jj)>=0.7 dR(lj)>=0.0 M_top = 175 GeV. Alpgen Data Samples. W+NJets Wbb+NJets Z+NJets

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Alpgen MC Samples Jet Flavour Identifier Lepton ID Plots

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  1. Alpgen MC Samples Jet Flavour Identifier Lepton ID Plots

  2. Alpgen Settings for CMS • Alpgen v2.05 CMS • Default kinematic cuts in Alpgen • Pt(l,c,b) > 20 GeV • |eta (j,c,b)| < 5.0 • |eta(e,mu,tau)| < 3.0 • dR(jj)>=0.7 • dR(lj)>=0.0 • M_top = 175 GeV

  3. Alpgen Data Samples • W+NJets • Wbb+NJets • Z+NJets • Zbb+NJets (running & failing on grid) • WW/WZ/ZZ

  4. Jet Multiplicity • Hard process has to be showered. Afterwards two possible modes: • Inclusive: Events with extra Jets due to the parton shower are kept. • Exclusive: Events with extra jets are rejected. • For a exclusive sample set the one with the highest jet mulitplicity must be a inclusive sample

  5. Electron |eta| < 2.4 Pt > 26 GeV Muon |eta| < 2.1 Pt > 19 GeV TQAF ID LeptonID >= 1 Track Isolation < 0.1 Likelihood Ratio > 0.5 Jets |eta| < 5 Pt > 30 GeV btag > 0.54 MET > 30 Cuts in Event Selection

  6. Selection Efficiency W+Jets

  7. Jet Flavour Identifier • Algorithmic Definition • Physics Definition

  8. JFI – Algorithmic Definition • Find Parton that most likely determines the properties of the jet and assign its flavour as the “true” jet flavour • If b or c quark matches to jet cone (ΔR < 0.3) label jet as b or c jet • Else assign flavour of hardest parton to the jet

  9. JFI – Physics Definition • Match reco jet to initial partons from primary process with ΔR < 0.3 • No matching if hard final state radiation changes the parton direction significantly • No flavour assignement if matching is ambigous: >1 initial partons match the jet • Gluon jets splitting to c or b quarks are labeled as gluon

  10. Jet Flavour in W+Jets • W+Jets Pretag Sample • TQAF uses Algorithmic Definition • all jets in the events after preselection

  11. Selection Efficiency Wbb+Jets Wbb+0/1 Jets not available yet

  12. Selection Efficiency Z+Jets

  13. Selection Efficiency Di-Boson

  14. Selection Efficiency

  15. Track Probability Jet Tags Distribution Peaks stem from bug in CMSW 1.3.6 algorithm. Fixed in CMSSW >= 1.5X

  16. Lepton ID - Electrons TQAF 136 070822 TQAF 136 071018 55 30245 978 55 209 45 978

  17. Likelihood Ratio - Electrons TQAF 136 070822 TQAF 136 071018 55 30245 978 55 209 45 978

  18. Likelihood Ratio - Muon 11 50252 321 11 502 52 321

  19. Track Isolation - Electrons TQAF 136 070822 TQAF 136 071018 55 30245 978 55 209 45 978

  20. Track Isolation - Muon TQAF 136 070822 TQAF 136 071018 52 32111 502 52 32111 502

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