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Recent Results and Future Plans in Top Quark Physics from Tevatron Experiments

This summary covers recent updates and future directions in top quark research at the Tevatron accelerator. Topics include top quark mass measurements, cross-section analyses, and detector upgrades. The text also discusses upcoming research strategies and contributions to simulation validation. The speaker committee is seeking suggestions for talks at the BEACH conference in Chicago, focusing on LHC physics. Details and options for participation can be found on the conference website.

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Recent Results and Future Plans in Top Quark Physics from Tevatron Experiments

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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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