Gen 5 MC validations

Top signal samples

• Variables: Pt (ttbar, top, w, w-parton, b-parton, lepton) at generator; Et (leading jet, tight jet, sum of tight jets, sum of soft jets (ISR/FSR) ), and Njets at the generator and reconstructed level
• Problem in Pythia ttopui, and Herwig ttopti sample: see my talk in top mass meeting on Sep. 1
• Lower top mass in Pythia (ttopui): due to the wrong Pt tuning:

request new Pythia MC (ttopel) with correct tune
• 2 GeV Higher top mass in Herwig (ttopti): difference between 4.11.1 vs 5.3.2 is Herwig version ( v6.4 vs v6.504)

 (But according to manual, I don't see any updated item which can explain this difference, well...)
 request new Gen Herwig MC (ttopgl) with Mtop=175 for a direct comparison with Gen4 MC.
• Fixed Pythia (ttopel): comparison with ttopui: 178 GeV
•  Njets, Et  from ISR/FSR
•  Tight Njet,  Et
• Top mass (MPV: 176.8+-0.3(ttopel), 177.3+-0.7(ttopui))

 
• Herwig 6.4 vs Herwig 6.504 difference
• Top mass template using HEPG particle jets: ttopli (input:175 vs output:175) ttopti(input 178 vs output 180), why?

 
• Comparison of Gen 5 Herwig (ttopgl) vs Gen 4 Herwig (ttopli) with same Mtop=175 GeV
•  top mass template using HEPG particle jets: ttopgl(input 175 vs output 177, still higher)
• Comparison of Pt (top, w, b-parton, lepton) for ttopli and ttopgl: identical (good!)
• Comparison of Leading jet Et, tight Jet Et, Njets (tight): Gen 5 is higher. Why? PS shower process is different?
• Back to the bottom level check: total energy conservation?
• Total energy is NOT conserved in Herwig again!!! : both Toroto(ttopti) and CAF different mtop samples(ttopem,ttopgl)
• Pythia same (ttopui) is conserved.
• Is this a compiler problem again ? like 4.9.1 or Herwig 6.504 problem itself in showering?
• Energy conservation problem: herwig lib. compiled with gcc 2.96 by FNAL was a problem

• Comparison of Gen5 Herwig 6.505, 6.504 and V6.4: now looks good
• See my talk in the TMT meeting, Kohei's talk in Lep-Jet meeting

• Comparison of the Gen5 and Gen4 Pythia (ttop0z vs ttopei)
• HEPG particle: Lepton Pt,   W Pt,   b parton Pt
• HEPGjet: Tight jets (Et>20, |eta|<2.0): Njets,  Jet Et,    Leading Jet Et,    SumEt
• HEPGjet: Loose jets (Et>12, |eta|<3.0): Nets,     Jet Et,     ISR/FSR jet Et,       Sum Jet Et(ISR/FSR)
• HEPGjet: Top mass template: 1tag (with 15% jet smearing )
• Comparison of the Gen5 and Gen4 Herwig (ttopeh vs ttopli)
• HEPG particle: Lepton Pt,   W Pt,   b parton Pt
• HEPGjet: Tight jets (Et>20, |eta|<2.0): Njets,  Jet Et,    Leading Jet Et,    SumEt
• HEPGjet: Loose jets (Et>12, |eta|<3.0): Njets,    Jet Et,     ISR/FSR jet Et      Sum Jet Et(ISR/FSR)
• HEPGjet: Top mass template: 1tag ( with 15% jet smearing )
• RecJet: Top Mass Template 1tag

• Effect of the QED photon in the ttbar (Nov. 15, 2004)
• Comparison of the Gen5 Herwig QED ON and OFF (ttopvh vs ttopeh)
• HEPG particle: Lepton Pt,   W Pt,   b parton Pt
• HEPGjet: Top Mass Template 1tag (with 15% jet smearing)
• RecJet: Top Mass Template 1tag
• Comparison of the Gen5 Herwig QED ON and Pythia ON (ttopvh vs ttop0z)
• HEPG particle: Lepton Pt,   W Pt,   b parton Pt
• HEPG particle: Del R (linear scale) (between photon and lepton(from W decay)
• HEPG particle: Pt_photon (Rate looks fine: Herwig: 3% (Pt>3 GeV), 1.4%(Pt>10), Pythia: 4%, 1.8% respectively)
• HEPG particle: Mother IDs for the QED FSR from the leptons of W decays in ttbar

Top background samples

• W+njets
• Wbb+njets
• Wcc+njets
• Sing top