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The Tevatron Connection

The Tevatron Connection. and comparisons with theory!. A Few CDF Run 2 Proton-AntiProton Cross Sections. Top Pair Cross-Section. Single Top Cross-Section. J/ Y Cross-Section. b-Hadron Cross-Section. b-Jet & b-DiJet Cross-Sections. Charm Meson Cross-Sections. g + b/c Cross-Sections.

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The Tevatron Connection

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  1. The TevatronConnection and comparisons with theory! A Few CDF Run 2 Proton-AntiProton Cross Sections • Top Pair Cross-Section • Single Top Cross-Section • J/Y Cross-Section • b-Hadron Cross-Section • b-Jet & b-DiJet Cross-Sections • Charm Meson Cross-Sections • g + b/c Cross-Sections • g + g Cross-Section • Z-boson Cross-Section We now have over 400 pb-1 of data! • W-boson Cross-Section • W+n Jets Cross-Sections • W/Z + g Cross-Sections • W + W Cross-Section • Z + W & Z + Z Cross-Sections • Inclusive Jet Cross-Sections Rick Field - CDF/Florida

  2. Top Pair Cross SectionCDF Run 2 Summary 200 pb-1 • Observed cross sections consistent with each other and with the standard model prediction (1.96 TeV, mt = 175 GeV) Bonciani et al., Nucl. Phys. B529, 424 (1998) Kidonakis and Vogt, Phys. Rev. D68, 114014 (2003) Rick Field - CDF/Florida

  3. s-channel t-channel t-channel Single Top Cross SectionCDF Run 2 Search 0.88 pb 1.98 pb • Search for W + 2 jets and tag one b. Do likelihood fit to HT (s+t channed combined). st < 10.1 pb @ 95% CL st+s < 17.8 pb @ 95% CL Rick Field - CDF/Florida

  4. J/   B K The J/Y Cross SectionCDF Run 2 • The J/y inclusive cross-section includes contribution from the direct production of J/y and from decays from excited charmonium, Y(2S), and from the decays of b-hadrons, B-> J/y + X. J/y coming from b-hadrons will be displaced from primary vertex! 39.7 pb-1 Down to PT = 0! Rick Field - CDF/Florida

  5. b-hadron Cross SectionCDF Run 2 • Run 2 b-hadron PT distribution compared with FONLL (CTEQ6M). Cacciari, Frixone, Mangano, Nason, Ridolfi • Excellent agreement between theory and experiment! 39.7 pb-1 |Y| < 1.0 b-hadron PT Rick Field - CDF/Florida

  6. b-Jet Cross SectionsCDF Run 2 Arbitrary normalization! • b-quark tag based on displaced vertices. Secondary vertex mass discriminates flavor. • Require one secondary vertex tagged b-jet within 0.1 < |y|< 0.7 and plot the inclusive jet PT distribution (MidPoint, R = 0.7). Rick Field - CDF/Florida

  7. b-DiJet Cross SectionCDF Run 2 Normalized to one! bJet-bbarJet invariant mass bJet-bbarJet Df • Require two secondary vertex tagged b-jets within |h|< 1.2. One of these tagged jets has to have a corrected tranverse energy greater than 30 GeV, the other has to have a raw transverse energy greater than 10 GeV. Rick Field - CDF/Florida

  8. Prompt Charm Meson Cross SectionsCDF Run 2 • Theory calculation from M. Cacciari and P. Nason: Resummed perturbative QCD (FONLL), JHEP 0309,006 (2003) Rick Field - CDF/Florida

  9. g + b/c Cross SectionsCDF Run 2 • b/c-quark tag based on displaced vertices. Secondary vertex mass discriminates flavor. Rick Field - CDF/Florida

  10. g + b/c Cross SectionsCDF Run 2 g + b g + c • PYTHIA Tune A correctly predicts the relative amount of u, d, s, c, b quarks within the photon events. ET(g) > 25 GeV Rick Field - CDF/Florida

  11. g + g Cross SectionCDF Run 2 g + gDf g + g mass • Di-Photon cross section with 207 pb-1 of Run 2 data compared with next-to-leading order QCD predictions from DIPHOX and ResBos. Rick Field - CDF/Florida

  12. Z-boson Cross SectionCDF Run 2 • Impressive agreement between experiment and NNLO theory (Stirling, van Neerven)! Rick Field - CDF/Florida

  13. W-boson Cross SectionsCDF Run 2 • Impressive agreement between experiment and NNLO theory (Stirling, van Neerven)! Rick Field - CDF/Florida

  14. Alpgen + HERWIG W + n Jets Cross SectionsCDF Run 2 • Run 2 W + n Jets Cross Section compared with Run 1 (JetClu, R = 0.4). • Run 2 data compared with Alpgen + HERWIG. Rick Field - CDF/Florida

  15. W + g Cross SectionsCDF Run 2 ET(g) > 7 GeV R(lg) > 0.7 Rick Field - CDF/Florida

  16. Z + g Cross SectionsCDF Run 2 Note: (W)/(Z) ≈ 4 while (W)/(Z) ≈ 11 ET(g) > 7 GeV R(lg) > 0.7 Rick Field - CDF/Florida

  17. W+W Cross SectionCDF Run 2 Campbell & Ellis 1999 Rick Field - CDF/Florida

  18. Z+W, Z+Z Cross Sections CDF Run 2 Upper Limit Rick Field - CDF/Florida

  19. Inclusive Jet Cross Section CDF Run 2 353 pb-1! ET > 500 GeV! Parton Level! Calorimeter Level! • The challenge is that we measure the jets at the “calorimeter level”. We do not measure partons! Rick Field - CDF/Florida

  20. Inclusive Kt Jet Cross SectionCDF Run 2 I wish we had a QCD NLO Monte-Carlo Model with Parton-Showers, Fragmentation, Beam-Beam Remnants, etc.! We are using Kt and MidPoint in Run 2! • The Run 2 Kt inclusive jet cross section compared with PYTHIA Tune A (CTEQ5L). Rick Field - CDF/Florida

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