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News and Communications

News and Communications. M. Cobal, University of Udine. Summary of recent results from CDF and DO Plans for the future Requests from the Speaker Committe. Tevatron- Introduction. Luminosity goal: 4.4-8.5 fb -1 by FY 2009 Record: 6.8x10 31 cm -2 s -1. CDF underwent serious upgrades:

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News and Communications

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  1. News and Communications M. Cobal, University of Udine • Summary of recent results from CDF and DO • Plans for the future • Requests from the Speaker Committe

  2. Tevatron- Introduction • Luminosity goal: • 4.4-8.5 fb-1 by FY 2009 • Record: 6.8x1031cm-2s-1

  3. CDF underwent serious upgrades: New tracking system COT, new silicon tracker (6-7 layers DS+1 SS) New forward calorimetry Tracking at trigger level Tracks at L1 Displaced from PV@L2 D0: change of philosophy New tracking system Based on a 2T solenoid New 8 layers (fiber) tracker Secondary vertices capability (SVX) Improved muon coverage New features at trigger level Two detectors

  4. Accelerator delivers.. Detectors use: Data taking…7x1031…

  5. A summary: Single top process would measure |Vtb|2 directly... s <13.7 pb (combined) s<8.5 pb (t-channel) Top s (ttbar and single top)

  6. A number of channels explored by D0 Nice comparison with past and theory… Top – Cross-section

  7. Look for top content in W+jets sample SLT Top Cross-Section kinematic soft m tag Svx tag NN on kinematic variables

  8. A summary: Top Cross Section

  9. A number of channels explored by D0 Nice comparison with past and theory… Top Cross Section

  10. Cross Section: all the results Combined value will be calculated soon

  11. Top Quark Mass Recent Updates Run II data, ~126 pb-1   mt=175.0 +17.4-16.9 8.4 (syst) GeV/c2 Run II data, ~102 pb-1mt=177.5 +12.7-9.4 7.1 (syst) GeV/c2 Run I data (revisited), ~125 pb-1mt  = 180.1  3.6  3.9(syst) GeV/c2 Run II data, ~126 pb-1   Lepton + Jetsmt=177.8 +4.5-5.0 6.2 (syst) GeV/c2 Likelihood Method Run II measurements will be more precise than Run I results soon In the meantime Run I Tevatron average was re-done with D0’s new update

  12. Top Quark Mass New Run I Combination mHiggs  = 117 +67–45 GeV/c2 Or mHiggs  < 251 GeV/c2 (95% CL)

  13. Top mass and Higgs: Where we are

  14. M. Mangano,IFAE, Apr 2004

  15. Look in: http://www-d0.fnal.gov/www_buffer/pub/publications.html#ACCEPTED • Paper Category: ACCEPTED An Improved Measurement of the Top Quark MassNature {}{}{2004}. Not yet. PS

  16. Top Quark Properties Single Top Production Direct Measurement of B(tWb) Sensitivity already better than Run I Measurement of W Helicity New Run I measurement: F0 = 0.56  0.31(stat+mt)  0.07 (syst) Combined search t-channel search ss+t < 13.7 pb-1 @ 95% CL st < 8.5 pb-1 @ 95% CL

  17. Latest Results! (Blessed on 28/04/04..) • Study of top quark decay branching ratio Channel: dilepton, study of ratio: BR(t->τ νb)/BRSM(t->τ νb) Limit: < 5.0 @ 95% C.L. With 193 pb-1 • Top quark mass Channel: single lepton+jets, method: vertex b-tag (SECVTX) and templates Mass: 174.9 +7.1-7.7 (stat) +- 6.5 (syst) GeV/c2

  18. Near future of Mtop Tevatron only (di-lepton events or lepton+jet ) from W decays Status of inputs (preliminary): mt=(178.0  2.7 (stat)  3.3 (syst)) GeV/c2 (latest Tevatron updated combination – RunI data) mt=(175  17 (stat)  8 (syst)) GeV/c2 (CDF di-leptons – RunII data) mt=(178+13-9(stat)  7 (syst)) GeV/c2 (CDF lepton+jets – RunII data) mt=(174.9+7.1-7.7(stat)  6.5 (syst)) GeV/c2 (CDF lepton+jets – RunII data) Matter of statistics (also for the main systematics) and optimized use of the available information. Each experiment expects 500 b-tagged tt l+jets events/fb  DMtop ~ 2-3 GeV/c2 for the Tevatron combined (2-4/fb) mt  2.5 GeV ; mW  30 MeV  mH/mH  35% In 2009 (if upgrade is respected) from Tevatron: DMtop = 1.5 GeV !!

  19. What is left before the LHC starts? • Cover topics still open: cross section, couplings, exotic, resonances, • Define a strategy for validation of the MC input models (e.g: UE modeling and subtraction, jet fragmentation properties, jet energy profiles, b-fragmentation functions..) see M. Mangano talk at IFAE 2004 • Explore the effects of changing detector parameters in evaluating the top mass. • Perform commissioning studies with top events • Contribute to simulation validation • …

  20. M. Mangano,IFAE, Apr 2004

  21. M. Mangano,IFAE, Apr 2004

  22. M. Mangano,IFAE, Apr 2004

  23. Communications • Speaker needed BEACH (Beauty, Charm and Hyperons) conference in Chicago. (june 27th-july 3rd) We have two ATLAS talks confirmed. For one of them there are 2 options: "LHC top physics" and "LHC electroweak physics" The talk will be 15 and 20-25 minutes (plus questions). What we would like from the top and/or SM groups are suggestions for this talk: both of title/topic and possible speakers. It is conceivable we may be able to get a third (short=10') talk on whichever of SM/top we don't choose for the longer talk, but this is not guaranteed. http://capp.iit.edu/beach04/

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