1. Status and Prospects of D0 Run2 Michael Kirby, Radboud University Nijmegen NIKHEF Jaarvergadering Dec 21, 2005

2. December 21, 2005Michael Kirby, Radboud University Nijmegen 2 NIKHEF@D0 Group Detector Operations –Silicon Detector Operations –Radiation Monitor –Magnetic Field sensors Offline Contributions –Jet Energy Scale –Muon Reconstruction –Silicon Alignment –STT b-trigger –b tagging * (* See M. Anastasoaie talk)

3. December 21, 2005Michael Kirby, Radboud University Nijmegen 3 The Tevatron at Fermilab Proton anti-proton collider Main Injector & Recycler upgrades continue  p production and efficiency improvements imrproved Beam lifetime during collisions

4. December 21, 2005Michael Kirby, Radboud University Nijmegen 4 Projected Tevatron Integrated Luminosity Exceeded 2005 Design goal 1 fb -1 on tape D0 85% data eff Full dataset analysis by Jan 06 Projected 2 fb -1 end of CY 2006 D0 must survive 4-8 fb -1 … Start of fiscal year Current Record ~165 DoE Plan 2003

5. December 21, 2005Michael Kirby, Radboud University Nijmegen 5 The D0 Run II Detector

6. December 21, 2005Michael Kirby, Radboud University Nijmegen 6 D0 Silicon Detector Inner Radius 2.7 cm High Radiation Dose DSDM sensitive Critical for track resolution and b-tagging

7. December 21, 2005Michael Kirby, Radboud University Nijmegen 7 Silicon Lifetime Theo Pred DV Dose 8/05, 1 fb -1 6 fb -1 Breakdown @150 V

8. December 21, 2005Michael Kirby, Radboud University Nijmegen 8 New Run II Scheduler Zebra Mussels

9. December 21, 2005Michael Kirby, Radboud University Nijmegen 9 D0 Run IIb Upgrades Tevatron plans 14 wk shutdown March 1 Schedule set by Zebra Mussel eradication But can we eat them? No dolphins will be harmed during shutdown Layer 0 Silicon –mounted at r = 1.6 cm –Radiation Hard readout Trigger Upgrade –Track Trigger –Calorimeter online clustering –L2 Si Track Trigger Upgrade March - June 14

10. December 21, 2005Michael Kirby, Radboud University Nijmegen 10 Layer 0 Silicon Improved Impact parameter resolution Radiation Hardness extends D0 Lifetime Incorporated into L2 b-tag trigger Completely Assembled and Tested Zero bad chips Installation rigging constructed and in testing

11. December 21, 2005Michael Kirby, Radboud University Nijmegen 11 D0 Physics Results A. Naumann  Z  b  b P. Houben  Top Mass P. van den Berg  LED in Dimuons C. Galea  Z  M. Anastasoaie  WH L. Ancu  (Higgs) Extensive Physics Program 29 Run II publications 3 results submitted Full dataset analysis scheduled for Jan 06 B. Wijngaarden  b Jet Correlations F. Blekman  Top Production NIKHEF@D0

12. December 21, 2005Michael Kirby, Radboud University Nijmegen 12 B Physics Several B S Reco Channels Published B 0 S lifetime difference Combined B S Oscillation in two channels  m s >7.3 ps -1, sensitive 9.3 ps -1

13. December 21, 2005Michael Kirby, Radboud University Nijmegen 13 Top Cross Section Several selection channels lep+jet, di-Lep, All jet All Jet Cross Section -Defended and Submitted F. Blekman

14. December 21, 2005Michael Kirby, Radboud University Nijmegen 14 Top Mass Use Several Advanced Techniques Use 2-D fit for JES vs M W JES still limiting systematic only light jets Lep +jets Ideogram P. Houben

15. December 21, 2005Michael Kirby, Radboud University Nijmegen 15 Jet Energy Scale Corrections Goal to improve upon Run I error <2% Full Jet Spectrum –E T below 20 GeV New Calibration just released Jeroen Hegeman working on Showering corrections b-jet/light-jet energy scale is significant error on top mass (0.8 GeV) –(error comes from frag., colour flow, semileptonic decay fraction, etc.) Z  bb to reduce error Muon triggered analysis ongoing A. Naumann New STT b-tag trigger included for better eff S. Caron –70% trig eff –5x BG reduction

16. December 21, 2005Michael Kirby, Radboud University Nijmegen 16 Electroweak W Mass and Width Tevatron potential for greatest precision –TEVEWWG Technically challenging –Energy Scale –P Scale –Detector Simulation WW Cross Section Background for Higgs

17. December 21, 2005Michael Kirby, Radboud University Nijmegen 17 Higgs H  b  b decay dominates for light Higgs Improvements extend Higgs Searches –b-tag Trigger –NN b-tagging Extensive Channel Search –WH  WWW  lep –WH  Wb  b –ZH  b  b –h  gg –b  b   b  bb  b

18. December 21, 2005Michael Kirby, Radboud University Nijmegen 18 New Phenomenon Large number of Searches –SUSY –Extra Dimensions –Compositeness –Resonances –Anomalous Production Nothing so far Di Muon LED Search –P. van den Berg Improve  Reco

19. December 21, 2005Michael Kirby, Radboud University Nijmegen 19 Summary D0 active in large area of research NIKHEF Strong presence in operations and analysis Tevatron performance above design goal Data processing and Analysis keeping pace Extend Higgs search Precision M T and M W If only it were this easy… Great physics prospects now and with 8 fb -1 !

20. December 21, 2005Michael Kirby, Radboud University Nijmegen 20 backup slides…

21. December 21, 2005Michael Kirby, Radboud University Nijmegen 21 Detector Performance D0 Detector Operating Efficiently >85% Achieved major milestone with 1 fb -1 Processing of full datasets by end Dec05 Full dataset analysis planned for Jan 06 With cancelation of RunIIb upgrades, detector must survive 4-8 fb -1 …

22. December 21, 2005Michael Kirby, Radboud University Nijmegen 22 b-JES Improvements STT upgrades Signal efficiency Published Results –Top Cross Section (Dilepton, l+jets, W Helicity) –B S,B +,B 0 Lifetimes and  ct in B S –LED in Dimuons –Diboson –QCD –29 Run II published results, 3 submissinos

23. December 21, 2005Michael Kirby, Radboud University Nijmegen 23 Silicon Radiation Damage Si Detector Depletion Voltage (DV) impacted by radiation Fluence of particles measured from leakage current –4x10 12 (1 Mev n/cm 2) Measuring DV from track hit eff and n-side noise –two methods give equivalent results SL1 projected to breakdown at <7 pb -1 Radition Dose N-side noise Si Hit Eff