Aurelio Juste (Fermilab) Rencontres de Moriond, March 20021 OUTLINE Tevatron Run 2 The upgraded DØ Detector Status Performance First Physics Results Outlook.

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Aurelio Juste (Fermilab) Rencontres de Moriond, March OUTLINE Tevatron Run 2 The upgraded DØ Detector Status Performance First Physics Results Outlook Aurelio Juste (Fermilab) On behalf of the DØ Collaboration

Aurelio Juste (Fermilab) Rencontres de Moriond, March CDF D interactions/xing bunch xing (ns)  Ldt (pb -1 /week) 5.2x x x10 30 typ L (cm -2 s -1 )  s (TeV) 140x10336x366x6 #bunches Run 2bRun 2aRun 1b The Tevatron Run 2 Tevatron upgrade: Increased energy 1.8 TeV  1.96 TeV Increased luminosity 0.1 fb -1  2 fb -1  15 fb -1 Detector upgrades: Higher event rates and backgrounds (electronics, DAQ, trigger) Considerable expansion of the physics capabilities (Run 1) (Run 2a)(Run 2b) Physics opportunities: Top Higgs New Phenomena Electroweak Beauty QCD

Aurelio Juste (Fermilab) Rencontres de Moriond, March The Upgraded DØ Detector Builds on the strengths of DØ: Excellent calorimetry with faster readout Upgraded muon system for better  -ID Augments its tracker and trigger capabilities: Inner tracking (silicon tracker, fiber tracker) with 2T superconducting solenoid Preshowers Pipelined 3-level trigger

Aurelio Juste (Fermilab) Rencontres de Moriond, March The Upgraded DØ Detector Inside collision hall before putting the wall

Aurelio Juste (Fermilab) Rencontres de Moriond, March date Integrated Luminosity (pb -1 ) 2002 Projected Integrated Luminosity Considerable fraction (~25%) of collected luminosity devoted to detector commissioning. Significant progress in identification of “physics objects”: e, , jets, electromagnetic and jet energy scales, etc. Run 2 in and 2002 plans In the next few months: Finish detector commissioning Complete triggers and improve DAQ Debugging, calibration, alignment Refine reconstruction algorithms … Also looking forward to more integrated luminosity!!! DØ roll-in Run II start First Collisions Detector Commissioning; Timing in; Improve electronics, DAQ and offline

Aurelio Juste (Fermilab) Rencontres de Moriond, March Silicon Microstrip Tracker (SMT) ~ 2.4 m SMT half cylinder - ~800,000 readout channels - 6 barrels (4 layers) with interspersed (F-)disks - 4 external large area (H-)disks for forward tracking (2 < |  | < 3) - Single (axial) and double sided (axial+stereo) detectors - 3D track reconstruction capabilities 100% commissioned Barrels: 95.2% operational F-disks: 95.8% operational H-disks: 86.5% operational Primary Vertex with SMT Tracking

Aurelio Juste (Fermilab) Rencontres de Moriond, March Central Fiber Tracker (CFT) - 20 cm < r < 51 cm - 8 layers of axial and stereo 830  m  scintillating fibers - ~12m long clear wave-guide to Visible Light Photon Counter (VLPC) 9K operating temperature 85% QE, excellent S/N - ~77k readout channels - Fast pick-off for trigger axial: 100% readout stereo: 52% readout Fully commissioned by mid-April p T >3 GeV DCA resolution ~ 60  m (unaligned!) beam spot ~  m DCA: Distance of Closest Approach track x y CFT tracks (SMT+CFT) Global tracks Completed CFT Mechanical

Aurelio Juste (Fermilab) Rencontres de Moriond, March Calorimeter Preserve excellent Run 1 calorimetry: LAr sampling: stable, uniform response, rad. hard., fine spatial segmentation U absorber (Cu/Steel for coarse hadronic) Uniform, hermetic, full coverage (|  | < 4.2) Compensating (e/  ~1) Good energy resolution … and upgrade electronics: Reduced bunch spacing L1 trigger Preserve noise performance 100% commissioned ~55K readout channels ~0.1% dead/noisy   W  e candidates E T (cluster)/p T (track) 3-jets event E T jet1 ~310GeV E T jet2 ~240GeV E T jet3 ~110GeV Missing E T ~8GeV

Aurelio Juste (Fermilab) Rencontres de Moriond, March Muon System Coverage to |  |<2 Emphasize  -ID at all trigger levels Momentum determination not precise (use inner tracking) Good time resolution (~2.5 ns) of trigger scintillators to remove out-of-time background (cosmics) 100% commissioned Bottom B/C Scint A-  Scint PDTs Forward Tracker (MDTs) Shielding Forward Trigger Scint Z  +  - candidate event m  ~ 103 GeV CFT tracks matched to muon system

Aurelio Juste (Fermilab) Rencontres de Moriond, March Integrated luminosity: ~1 pb -1 Not fully corrected distributions: Preliminary correction for jet energy scale (but no unsmearing of resolution effects) No correction for trigger (small kinks) or selection efficiencies QCD Physics Only statistical errors

Aurelio Juste (Fermilab) Rencontres de Moriond, March B-Physics bb di-muon candidate p T rel = 1.25 GeV/c p T rel = 1.01 GeV/c KS0+-KS0+- From  triggers (Central+Forward) Muon System only Tracking J/  +  - Mean = 3.08 ± 0.04 GeV Sigma = 0.78 ± 0.08 GeV

Aurelio Juste (Fermilab) Rencontres de Moriond, March B-Physics (cont’d) Normalized  +jet differential cross-section (data sample <0.2 pb -1 ). Trigger and reconstruction efficiencies and jet energy scale corrections included.  Consistent in shape with DØ Run I results in same kinematic region. Transverse momentum of the  with respect to the jet axis is a good discriminant between direct b  and backgrounds.  Evidence for the b-content in the  +jet sample.

Aurelio Juste (Fermilab) Rencontres de Moriond, March Z  ee selection SMT+CFT Global tracks Z  ee candidate m ee = 93.2 GeV Electroweak Physics (W/Z, Top, Higgs) W  e (no jets) selection Events/2 GeV/c 2 M T (GeV/c 2 ) Events/2 GeV/c 2 M T (GeV/c 2 ) Estimated background (mostly ,  0 ) Require  1 track-EM cluster match W(  e  +jets selection 335 events Signal:~ events Signal:~75

Aurelio Juste (Fermilab) Rencontres de Moriond, March New Phenomena Physics Important signature for new physics searches (SUSY, extra dimensions, etc). Determine ME T resolution from inclusive di-electron sample w/ at least one track match. D  Run 2 Preliminary EM 11 22 Search for Trileptons Missing E T =31.8 GeV m   = 41.5 GeV 22 11 EM p T = 9.82 GeV  =  = 2.88 charge = 1 p T = 28.2 GeV  =  = 6.20 charge = -1 E T = 19.2 GeV  = 0.40  = 0.63 no track match e  candidate event Trilepton events are one of the cleanest signatures of SUSY (e.g. chargino+neutralino production through W*) Di-EM+Missing E T channel

Aurelio Juste (Fermilab) Rencontres de Moriond, March Outlook The Tevatron Run 2 started in March It is offering one of the most exciting physics programs for the next decade. Enormous progress made over the course of the last year in terms of detector commissioning. Entering physics results phase. Integrated luminosity delivered so far ~20 pb -1. Expect ~300 pb -1 by the end of Preliminary performance results are encouraging and indicate that the upgraded DØ detector will be able to fully exploit the available physics opportunities. First physics results already emerging: J/ , W, Z, jet distributions, searches, etc. It will get even better: –optimization of detector, trigger and DAQ performances, –calibration,alignment, –improved selection and reconstruction procedures, –... –and lots of integrated luminosity! Expect a lot more for the Summer Conferences!!!