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DØ Report

DØ Report. NIKHEF SAC meeting 15/11/2004 (report for internal use only) Sijbrand de Jong. Tevatron performance DØ hardware status Physics with DØ Transition to ATLAS. Tevatron Past Performance. Tevatron Future Performance. Electron beam cooling (being installed now,

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DØ Report

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  1. DØ Report NIKHEF SAC meeting 15/11/2004 (report for internal use only) Sijbrand de Jong • Tevatron performance • DØ hardware status • Physics with DØ • Transition to ATLAS NIKHEF SAC, Sijbrand de Jong

  2. Tevatron Past Performance NIKHEF SAC, Sijbrand de Jong

  3. Tevatron Future Performance Electron beam cooling (being installed now, commissioning next year) Slip stacking at 1012 p/pulse every 2 seconds Increase pbar production aperture by 25% Increase stacking rate at small stacks Mixed pbar operation, the recycler starts to pay-off + many small improvements NIKHEF SAC, Sijbrand de Jong

  4. Tevatron Performance future NIKHEF SAC, Sijbrand de Jong

  5. Inner circle is size of golfball Tracking Status NIKHEF contribution to SMT construction and radiation monitoring Overall very stable over past year. Concerns: 17% of SMT dead (~ random regions) 1% channel loss in CFT (in VLPC cassettes) Tracking software performance (pattern reco & speed) Radiation damage expected for >5 fb-1 New L0 will cover (and even improve) NIKHEF SAC, Sijbrand de Jong

  6. Calorimetry and Muon System Status • Intermittent noise problems in calorimeter: • Hot patches, Rings of fire • Noise hunt pays off: • Found whole bunch of dead-shorts (metal washers instead of G10) • First indications of reduced noise sensitivity • Muon system performance efficient • and very stable NIKHEF contribution to muon reconstruction NIKHEF SAC, Sijbrand de Jong

  7. Forward Proton Detector Commissioned and operated stand-alone Soon to be operated routinely in DØ DAQ NIKHEF contributed Roman Pot thin windows and castles =Dp/p distribution NIKHEF SAC, Sijbrand de Jong

  8. Trigger and DAQ DAQ can handle bigger rates than foreseen (after extensive work) Read-out dead time of SMT limiting 1st level trigger Trigger needs additional functionality to cope with higher Luminosity and to allow lower thresholds, e.g. on jets Trigger upgrade is proceeding to plan 2nd level Silicon Track Trigger has been commissioned NIKHEF contribution to STT NIKHEF SAC, Sijbrand de Jong

  9. Reconstruction & MC Reconstruction improves continuously All data has been reprocessed (with p14) to physics quality (20% off-site) All data will be reprocessed again (with p17) to improve physics quality (100% off-site) >109 events to be processed Processing speed crucial (need to improve significantly) GRID usage essential MC producing about 106 events per week (world-wide) (e.g. at NIKHEF fully gridified) NIKHEF SAC, Sijbrand de Jong

  10. Highest efficiency day had 2/3 NIKHEF DAQ shifters in charge DØ Data taking efficiency NIKHEF SAC, Sijbrand de Jong

  11. QCD inclusive jet cross section NIKHEF SAC, Sijbrand de Jong

  12. bb production mechanisms Measured Pythia expected FCR (62±6±9) % (47±5) % GSP (21±7±18) % (43±5) % FEX (18±11±21) % (10±3) % Bram Wijngaarden thesis nearly finished NIKHEF SAC, Sijbrand de Jong

  13. OS-SS EW Zl+ l - Tau: thesis Silke Duensing work continued by Cristina Galea NIKHEF SAC, Sijbrand de Jong

  14. MT=pepn(1-cosen) EW W ln NIKHEF SAC, Sijbrand de Jong

  15. GW=2.0110.0930.107 GeV PDG: 2.1240.041 GeV W width NIKHEF SAC, Sijbrand de Jong

  16. WW, ZW, Wg , Zg llnn: s(ppWW) = (14  4) pb lll: s(ppZW) < 15 pb lng: s(ppWg) = (181  64) pb llg: s(ppZg) = (116  17) pb All in good agreement with SM NIKHEF SAC, Sijbrand de Jong

  17. Zbb Trigger: L1:m + jet(ETtower>5GeV) offline selection: 2 jets, ET>15GeV, back-to-back Problem with turn-on curve for jets ! Still working on this ! Not yet reliable Axel Naumann thesis in the works NIKHEF SAC, Sijbrand de Jong

  18. new charm hadron XJ/ p+p- mX=38724 GeV (Belle has 3872.00.8 GeV) Width 173 MeV NIKHEF SAC, Sijbrand de Jong

  19. t(Lb)=(1.22+0.220.04) ps -0.18 The bottom line NIKHEF SAC, Sijbrand de Jong

  20. B0d lifetime 2D-fit in mass and lifetime Signal template Background lifetime is mass Dependent ! Thesis of Paul Balm (defense 8 Dec 04) Background template NIKHEF SAC, Sijbrand de Jong

  21. t(Bs)=1.444+0.0980.020 ps -0.090 t(Bs)/t(B0)=0.980+0.0750.003 -0.075 B0s lifetime NIKHEF SAC, Sijbrand de Jong

  22. Excited bottom hadrons B**/BJ Bp resonances mB1=5724MeV mB2*=5748MeV NIKHEF SAC, Sijbrand de Jong

  23. Bc J/ m X final state m(Bc)=5.950.37 GeV t(Bc)=0.450.17 ps NIKHEF SAC, Sijbrand de Jong

  24. B0d mixing Final state flavour: sign m in BD*mX 3 methods of initial state flavour tagging: Opposite side soft muon: Dmd=0.5060.0550.049 ps-1 Same side fragmentation pion: Dmd=0.4880.0660.044 ps-1 Comby of above two + same side jet charge: Dmd=0.4560.0340.025 ps-1 Bs mixing in the works NIKHEF SAC, Sijbrand de Jong

  25. tt  l+n+4 jets Single tag Double tag CSIP SVT e channel in thesis of Lukas Phaf (cum laude) NIKHEF SAC, Sijbrand de Jong

  26. tt  em+2n+bb S:N=70:1 NIKHEF SAC, Sijbrand de Jong

  27. tt  em+2n+2 jets event NIKHEF SAC, Sijbrand de Jong

  28. tt  em+2n+2 jets event NIKHEF SAC, Sijbrand de Jong

  29. cut cut Thesis of Freya Blekman (expected soon) tt  6 jets >= 1 SVT tag NIKHEF SAC, Sijbrand de Jong

  30. Top cross section and mass Biggest problem: jet energy scale NIKHEF SAC, Sijbrand de Jong

  31. Single top production Theoretical work in Thesis Lukas Phaf CSIP +SLT Final state lnb s(single top)<23 pb (95%CL) SVT +SLT BG estimation samples Measured Br(tWb)/Br(tWq)=0.700.260.11 (SVT) NIKHEF SAC, Sijbrand de Jong

  32. SM Higgs WH  enbb: H  WW  lnln: Based on ~200 pb-1: Luminosity increase 30 expected Combine CDF and DØ: sensitivity 2 Optimise detector calibration, trigger, analysis: ? More channels (e.g. H t+t-): ? NIKHEF SAC, Sijbrand de Jong

  33. Doubly charged Higgs H++H--  m+m+m-m- NIKHEF SAC, Sijbrand de Jong

  34. SUSY, neutralinos NIKHEF SAC, Sijbrand de Jong

  35. squark/gluino decay into quark/(qq pair) + neutralino SUSY, squarks and gluinos Signal prediction: SUGRA m0=25GeV, A0=0, tanb=3 m<0 NIKHEF SAC, Sijbrand de Jong

  36. (Large) Extra Dimensions Looking for mm (Ms>1.36 TeV) and ee/gg (Ms>1.1 TeV) resonances (next slide) Jets+ETmis: Ms>0.7 TeV NIKHEF SAC, Sijbrand de Jong

  37. Jul 08 Jul 09 Jul 04 Jul 05 Jul 06 Jul 07 Jul 00 Jul 01 Jul 98 Jul 03 Jul 99 Jul 02 NIKHEF participation in DØ NOW Post-docs PhD students staff NIKHEF SAC, Sijbrand de Jong

  38. Towards ATLAS GRID tests under realistic conditions NIKHEF plays very active role in DØ GRID deployment Hadron collider physics analysis background Experienced staff on ATLAS Creating interest in hadron collider physics Positive atmosphere for ATLAS NIKHEF SAC, Sijbrand de Jong

  39. Summary • Tevatron luminosity looks promising (after slow start) • DØ is getting into shape • Calibration at physics paper level and improving • Ten’s of papers submitted this year • NIKHEF has significant contribution • High profile analyses: bottom • top • tau • Transfer of knowledge (GRID,…) • and experience (people,…) • to ATLAS NIKHEF SAC, Sijbrand de Jong

  40. Conclusion Up to you ! NIKHEF SAC, Sijbrand de Jong

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