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The D Ø Experiment now and later…

The D Ø Experiment now and later…. Hal Evans Columbia University . Sweeping Generalizations (broad goals of HEP) Experimental Specifics (the Tevatron & D Ø) Wild Predictions (Run II Physics at D Ø). Run II has started!. We haven’t seen the Higgs yet. Fundamental Forces: Bosons.

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The D Ø Experiment now and later…

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  1. The DØ Experiment now and later… Hal Evans Columbia University • Sweeping Generalizations (broad goals of HEP) • Experimental Specifics (the Tevatron & DØ) • Wild Predictions (Run II Physics at DØ) Run II has started! We haven’t seen the Higgs yet Cornell Colloquium - 30 April, 2001

  2. Fundamental Forces: Bosons Point-Like Particles: Fermions What do We Know? Cornell Colloquium - 30 April, 2001

  3. What’s it all about? The broad goal of HEP • measure something at odds w/ an SM prediction • hints of what lies beyond If it ain’t broke – fix it! • Has 19 arbitrary parameters • Higgs Mass not stable to radiative corrections •  ~ Mplanck for no new physics • Mh < 800 GeV  tuning to 10-16 • Why’s? of EW Symmetry Breaking • What about Gravity? • Why Mpl(1018GeV)»MEW(250GeV)? Cornell Colloquium - 30 April, 2001

  4. Where do we look? Concentrate on areas where • we don’t have complete understanding • measurements are few • EW Symmetry Breaking Higgs in SM • direct searches for Higgs / new particles • need highest possible energy (or lowest) • precision measurements of EW param’s • sensitivity to H.O. effects from Higgs/New Phys • effects in rare processes • New Phys couples to mass  t-,b-decays • Quark Weak vs. Mass Eigenstates CKM Matrix in SM • Mixing, CP Violation,… • B0, K0 decays • Lepton Weak vs. Mass Eigenstates same in SM • neutrino mass, mixing & CP • Strong Interactions QCD in SM • Perturbative vs. Non-perturb. Cornell Colloquium - 30 April, 2001

  5. Stalking the Higgs LEP EW-WG: hep-ex/0103048 Cornell Colloquium - 30 April, 2001

  6. Quark Weak  Mass Eigenstates CKM Mixing Matrix Independent param’s 3 angles 1 complex phase  CP-viol CP violation obs. in K0, B0 systs Unitarity of VCKM 12 eqn’s the Unitarity Triangle is one Quarks are all mixed up ! (,)    (0,0) (0,1) Cornell Colloquium - 30 April, 2001

  7. How to Build a Triangle Cornell Colloquium - 30 April, 2001

  8. Leptons too? Mixing formalism is possible for leptons • 2-flavor mixing is simplest Oscillation Probability • Posc = sin22 sin2(1.27m2L/E) • m2 = m12 – m22 Note:  = 0 in the SM Cornell Colloquium - 30 April, 2001

  9. There are lots of Ideas… Dynamical Symmetry Breaking Technicolor: running, walking, limping… Supersymmetry (SUSY) GMSSM, SUGRA, R-Parity Violating Large Extra Dimensions testable string theory! etc., etc., etc… They all answer some questions They all look like the SM at low E Differences only show up at high Energy small corrections to SM predictions 2 Strategies: Look Harder Precision Bigger Hammer Energy Some Guidance ? Cornell Colloquium - 30 April, 2001

  10. Higgs Mass problem can be solved by adding a Superpartner for every SM particle and 5 Higgs: h0, H0, A0, H± Usually require R-Parity Conserv LSP is stable (often ) Note: SUSY is a broken at low-E M(susy ptcl’s)  M(SM ptcl’s) Simplest SUSY models require Mh < 135 GeV (!!!) If you knew SUSY... Cornell Colloquium - 30 April, 2001

  11. UnderlyingEvent g q u u q d u d u Hard Scatter Collisions at the Tevatron p Collisions  qq(g) Interact’s • Fermilab Tevatron: • Circumference ~ 4 mi. • 20’ underground • 1000 super-conducting magnets Cornell Colloquium - 30 April, 2001

  12. The Times – they are a changin’ Major upgrade to the Tevatron • main injector • antiproton recycler Cornell Colloquium - 30 April, 2001

  13. DØ Collaboration >500 People 17 Countries Cornell Colloquium - 30 April, 2001

  14. DØ Run II Upgrade Forward Scint Central Scintillator Forward Mini-drift chamb’s Central PDTs Shielding Calorimeter Tracking: Solenoid,Silicon,Fiber Tracker,Preshowers New Electronics,Trigger,DAQ Cornell Colloquium - 30 April, 2001

  15. Status all detectors installed reading out ~25% cabling/checkout ~all by mid May tracks seen! • 6 Barrels • 12 F-Disks • 4 H-Disks 12 11 10 9 6 5 4 4 3 2 3 1 2 1 8 7 6 5 Silicon • 793k Channels • 3.0 m2 Si (1.6 m2 D.S.) • SVX IIe Readout • L2 Trigger (’02) Cornell Colloquium - 30 April, 2001

  16. Silicon Pictures Cornell Colloquium - 30 April, 2001

  17. Scint Fibers (830 m) 8 dbl Cylinders Axial & (±3o) Radii: 20 – 51 cm Active Lengths: 1.66 m (inner-2) 2.52 m (outer 6) VLPC Readout: ~77k Channels SIFT + SVX IIe L1 Trigger Info Status detector & w’guides installed reading out ~5% electronics in prod install electr over summer Fiber Tracker Silicon Solenoid Central Fiber Tracker Central Preshower Forward Preshower Cornell Colloquium - 30 April, 2001

  18. Fiber Tracker Pictures Cornell Colloquium - 30 April, 2001

  19. Status Central & Forward installed waiting for electronics (CFT) some noise issues in trigger Preshowers Central Calorimeter Central PS Solenoid Tracking Calorimeters Forward Forward PS Solenoid Tracking Cornell Colloquium - 30 April, 2001

  20. Forward PS Installed Cornell Colloquium - 30 April, 2001

  21. Detector Unchanged from Run I (U-LAr) New Electronics to cope with BX frequency Status reading out entire calorimeter waiting for final electronics mainly effects forward trigger New Calibration Tools Zbb (b-jet scale) Peak pos to 0.3% Requires STT E/P new track Pt meas. E/P Electrons Calorimeters Cornell Colloquium - 30 April, 2001

  22. Replace Forward System MDTs + Scint Pixels Add Scint’s in Central improved triggering PDTs from Run I remain Improve Beam Shielding Remake Trigger System Status all detector elem’s installed signals seen! ramping up triggers Muon System Trigger Scint (A-) Scint Pixels Toroids MDTs (Iarocci) PDTs(Run I) Shielding Bottom B/C Scint Cornell Colloquium - 30 April, 2001

  23. A-Layer Forward Pixels Cornell Colloquium - 30 April, 2001

  24. Other Systems Luminosity Monitor • operational Forward Proton Detector • improve DØ diffraction measurements • series of Roman Pots outside of quad’s ICD & Massless Gaps • fill cracks in calorimeter • electronics in production Cornell Colloquium - 30 April, 2001

  25. Conclusion: too much Physics! Trigger Happy 7 MHz • Single Sub-Det’s • Towers, Tracks, ET-miss • Some correl’s • Not deadtimeless L14.2 s(128 terms) F’work 10 kHz • Correlations • Calibrated Data • Physics Objects e,,j,,ET-miss L2100 s(128 terms) 1 kHz Data L350 ms(48 nodes) • Simple Reco • Physics Algo’s 50 Hz * M(H) = 100 GeV Cornell Colloquium - 30 April, 2001

  26. Status Level 1 basic triggers available driven by CFT electronics Level 2 electronics in production expect first triggers in June Level 3 running at reduced rate SBs redesigned & in prod FE FE FE FE FE FE FE FE SB 1 SB 4 Node Node Node Node DØ Trigger & DAQ Detector Level 1 Level 2 Level 3 & DAQ 7 Mhz 10 khz 1 khz Token rdout loop CAL L1Cal L2Cal VRC 1 VRC 8 c/f PS L1PS L2PS CFT L1CTT L2CTT SMT L2STT L1Mu evt tag loop MU L2Mu EvtTagGen FPD L1FPD L1,L2 Info Global L2 ethernet Lumi Framework Cornell Colloquium - 30 April, 2001

  27. Here it is! Cornell Colloquium - 30 April, 2001

  28. Detector Performance Cornell Colloquium - 30 April, 2001

  29. The Run II Game Plan Cornell Colloquium - 30 April, 2001

  30. Physics Galore! • Run II Tevatron Working Groups • http://www-theory.fnal.gov • Publications • Higgs hep-ph/0010338 • SUGRA hep-ph/0003154 • BTMSSM hep-ph/0006162 • RPV hep-ph/9906224 • GM SUSY hep-ph/0008070 • Electroweak Fermilab-PUB-00/297 • Top see web (above) • B see web (above) Cornell Colloquium - 30 April, 2001

  31. Background Properties Low ET Jets ET Balanced No High PT Leptons No Displaced Vertices QCD is IT Cornell Colloquium - 30 April, 2001

  32. Properties High ET Jet High PT Lepton Missing Energy Backgrounds QCD Instrumental (miss-meas.) Vector Bosons jet Cornell Colloquium - 30 April, 2001

  33. Properties High ET Jets Displaced Vertices Soft Leptons (b) High PT Leptons Missing Energy Backgrounds W/Z + jets WW, ZZ, WZ QCD + miss-meas. Top Production jet jet Cornell Colloquium - 30 April, 2001

  34. Properties Displaced Vertices Soft Leptons (b) Backgrounds QCD Other B-decays B Production Cornell Colloquium - 30 April, 2001

  35. Properties High ET Jets Displaced Vertices Soft Leptons (b) High PT Leptons Missing Energy Backgrounds W/Z + jets WW, ZZ, WZ Top QCD + miss-meas. Higgs Cornell Colloquium - 30 April, 2001

  36. SM Higgs at the Tevatron Representative Cross-Sections (s = 2.0 TeV) Moral: Use WH / ZH Production Cornell Colloquium - 30 April, 2001

  37. Properties High ET Jets Displaced Vertices Soft Leptons (b) High PT Leptons Missing Energy Backgrounds W/Z + jets WW, ZZ, WZ Top QCD + miss-meas. Expect the Unexpected jet jet Cornell Colloquium - 30 April, 2001

  38. Recognizing Physics Cornell Colloquium - 30 April, 2001

  39. Precision Also watch for • W X-sect  Luminosity measurement • tWb / t Wq • tt Spin correlations • top Yukawa (ttH) • top – anti-top resonances Cornell Colloquium - 30 April, 2001

  40. Top Mass Errors W Mass Errors Most scale with luminosity What may not PDFs(): 7 MeV Run I Pt(W): 15 MeV Run I Precision EW Tests Run II proj Cornell Colloquium - 30 April, 2001

  41. Beauty Also watch for • b Production x-section & correlations • Bs Ds K, J/ , … • Bd mixing • B-hadron properties: lifetimes, spectroscopy, polarization • Onia Cornell Colloquium - 30 April, 2001

  42. DØ Assumptions: S/B ~ 0.75 Time res: t ~ 100 fs -  + b  -  - b + sin2 at DØ Cornell Colloquium - 30 April, 2001

  43. BJ/Ks Reconstruction • J/+- • 2 Muons: ||<2.0, PT>1.5GeV • Ks+- • Long lifetime rejects bgrd • Lxy/ > 5 • 4-Track Constrained Fit • mass: J/, Ks • vertex: KsB, B primary • unconstr: •  = 41 MeV <Lxy> = 2.3 mm • constr: •  = 10 MeV res = 100 m Cornell Colloquium - 30 April, 2001

  44. Searching Also watch for (list limited by imagination) • SUSY particle zoo • Technicolor • Your favorite Beyond the SM theory Cornell Colloquium - 30 April, 2001

  45. Key AreasImprove bb Mass Resolution 30% b-tagging Eff 80% Backgrounds bb Higgs Searches Cornell Colloquium - 30 April, 2001

  46. b-Quarks and the Higgs S/B vs Mbb S/B vs  b-tag Cornell Colloquium - 30 April, 2001

  47. Higgs at the LHC Cornell Colloquium - 30 April, 2001

  48. Beyond the SM – MSSM Tevatron Cornell Colloquium - 30 April, 2001

  49. Conclusions • Run II has started • Expect luminosity after May shutdown • Stable running after September • Run IIb  >15 fb-1 before LHC • DØ is ramping up • Finish instrumenting detector over summer • Full capability after September shutdown Cornell Colloquium - 30 April, 2001

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