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  1. CDF Tevatron Main Injector CDF: Status Report Outline Franco Bedeschi INFN - Pisa Riunione Gruppo 1 Catania, 18/9/02 • Status of the Tevatron • Status of the CDF detector • First results with Run II data • Run IIB upgrades • MOF status F. Bedeschi, INFN-Pisa

  2. Tevatron status • Tevatron operation update • Luminosity goals for run 2a: • 5-8x1031 cm-2sec-1 w/o Recycler • 2x1032 cm-2sec-1 with Recycler • Achieved: • 2.8x1031 cm-2sec-1 in July ’02 • June shutdown to fix p-bar cooling • 54 pb-1 delivered until early June • 35 pb-1 are on tape • 10 – 20 pb-1used for analyses shown at Summer Conferences • February 02 - June 02 period • Sample doubled with new data Slow increase Integr. Luminosity 54 pb-1 Delivered On tape 35 pb-1 F. Bedeschi, INFN-Pisa

  3. Tevatron status • Short term plans: • Run until new year • Load on Italian group foreign travel increased (shifts, on-call, etc.) • Reach goal w/o Recycler: • 5-8x1031 cm-2sec-1 • 1-2 months shutdown • Complete Recycler work • Commission and integrate Recycler during 2003 • Mostly in parallel with Tevatron colliding beam operation • Expect 100 – 150 pb-1 delivered in 2002 ~ Run 1 data set F. Bedeschi, INFN-Pisa

  4. Tevatron Status *”Achieved” refers to simultaneous performance. Best individual parameters are higher. F. Bedeschi, INFN-Pisa

  5. Injection and acceleration Shot 1583 showing: Loading of 36 proton bunches at 150 GeV Poor lifetime at 150 GeV Significant beam loss on acceleration Loading of 9x4 antiproton bunches at 150 GeV Ditto Luminosity potential 3.6E31 if acceleration losses eliminated, >4E31 if lifetime improved. Beam current antiprotons protons F. Bedeschi, INFN-Pisa

  6. Tevatron Status F. Bedeschi, INFN-Pisa

  7. CDF data taking efficiency • Avg. efficiency in data taking ~80% • Goal is > 90% • Reached already in several occasions F. Bedeschi, INFN-Pisa

  8. Status of the CDF Detector Central calorimeters Solenoid Central muon New Old Partially new Front end Trigger DAQ Offline TOF Endplug calorimeter Silicon and drift chamber trackers Forward muon F. Bedeschi, INFN-Pisa

  9. CDF Detector Status • Detector: • All systems installed and commissioned • SVX II much improved during June shutdown • 10/12 ISL cooling lines cleaned after June shutdown, will finish in January ‘03 • DAQ and trigger: • Running physics trigger table with > 100 trigger paths since February ‘02 • SVT very successful and improving • L2 problems largely solved F. Bedeschi, INFN-Pisa

  10. Detector Performance • Trigger: • Goal rates for L = 2x1032 • L1/L2/L3 = 50,000/300/50 Hz • Typical now for L ~ 1031 • L1/L2/L3 = 8,000/250/30 Hz • DAQ • Logging data at the planned rate of ~ 20 Mbyte/sec • Offline: • Data is reconstructed in quasi real time on a dedicated production farm • We take data at ~ same rate as goal luminosity! • Data analysis needs are little affected by low luminosity 2.5 396 F. Bedeschi, INFN-Pisa

  11. Detector Performance • Commissioning: • L00 > 95% • SVXII > 90% • ISL > 80% • Completing cooling work June shutdown ISL almost fixed % of silicon ladders powered and read-out * Concern about loss of connection to z-side in special situations. 4 ladders affected recently F. Bedeschi, INFN-Pisa

  12. Detector Performance • Silicon detectors: • Typical S/N ~12 • Alignment in R-f good • First reliable R-z iteration in production soon F. Bedeschi, INFN-Pisa

  13. Detector Performance • TOF resolution within 10 –20% of design value • Improving calibrations and corrections S/N = 1942/4517 TOF S/N = 2354/93113 F. Bedeschi, INFN-Pisa

  14. Detector Performance • XFT: L1 trigger on tracks • full design resolution • DpT/p2T = 1.8% (GeV-1) • Df = 8 mrad Efficiency curve: XFT cut at PT = 1.5 GeV/c Offline track XFT track F. Bedeschi, INFN-Pisa

  15. s=48 mm Detector Performance Online track impact param. • Secondary VerTex L2 trigger • Online fit of primary Vtx • Beam tilt aligned • D resolution as planned • 48 mm (33 mm beam spot transverse size) • 15% efficiency increase after downloading updated associative memory patterns (mostly Italian work) • NOT available in analyses that follow F. Bedeschi, INFN-Pisa

  16. Physics with CDF-II • Use data to understand the new detector: • energy scales in calorimeter and tracking systems • detector calibrations and resolutions • tune Monte Carlo to data • Use data to do physics analyses • Real measurement beyond PR plots • Quality of standard signatures • Rates of basic physics signals • Surprisingly some results are already of relevance in spite of the limited statistics • Several CDF presentations made in the parallel sessions • In the following brief/incomplete summary of a lot of work F. Bedeschi, INFN-Pisa

  17. Data Sample • Stable physics trigger table established since February ’02 • Summary of data used for ICHEP2002: • Data period: January – June, 2002 • Delivered luminosity: 33.0 pb-1 • Live (to-tape): 23.5 pb-1 • “Good runs”: 23.3 pb-1 • “Good runs” with all systems ~ 10.0 pb-1 (cfr. 110 pb-1 Run 1) • Radiation induced COT/SVX VME power supply failures (fixed!) • Instabilities in Silicon readout (much improved) • New data are waiting for update of production code for processing. Will start full reprocessing in October. F. Bedeschi, INFN-Pisa

  18. EM Calorimeter scale NZ = 247 Central-central • 638 Z  e+e- in 10 pb-1 • s(M) ~ 4 GeV • Check Z mass in data and simulation after corrections • Central region: • Mean: +1.2% data, -0.6% sim. • Resolution: +2% simulation • Forward region (Plug): • Mean: +10/6.6% data, +2.0% simulation • Resolution: +4% simulation Central-West plug Central-East plug NZ (W+E) = 391 F. Bedeschi, INFN-Pisa

  19. Measurements with high Et e± • Uncorrected Z e+e- angular distributions and asymmetries Measurements compared with Pythia/CTEQ5L prediction Back Back to index F. Bedeschi, INFN-Pisa

  20. Measurements with high Et e± • Clear evidence for W en signal • Isolated central electron • Et > 25 GeV, Et >25 GeV F. Bedeschi, INFN-Pisa

  21. Measurements with high Et e± • Good modeling of observed W en distributions F. Bedeschi, INFN-Pisa

  22. MET resolution • Minimum bias events • Run 1: 0.53/S Et with forward cal. Use |h|<4.2 • Run II: 0.60/S Et with plug only |h|<3.6 • With miniplug |h|<5.5 F. Bedeschi, INFN-Pisa

  23. Measurements with high Et e± 0.10 soon! 0.16 now! • W cross section: • sW*BR(Wen) (nb) = 2.60±0.07stat±0.11syst ±0.26lum • Consistent with Run 1 results rescaled for higher energy: 2.72±0.02stat±0.08syst ±0.09lum (use Sterling et al. NNLO predictions) Nr. Candidates: - 5547 in 10 pb-1 Background: - QCD: 260 ± 34 ± 78 - Z ee: 54 ± 2 ± 3 - Wtn: 95 ± 6 ± 1 F. Bedeschi, INFN-Pisa

  24. Measurements with high Et m± • Clear evidence of Z m+m- • Signal shown for OS muons detected in both inner and outer muon chambers m1 m2 • 57 candidate events in 66<Minv<116 range • NZ = 53.2±7.5 ±2.7 F. Bedeschi, INFN-Pisa

  25. Measurements with high Et m± • Good modeling of observed Wmn distributions • Measure s(Wmn) and R=s(Wmn)/s(Zmm) Longitudinal beam profile MET F. Bedeschi, INFN-Pisa

  26. Measurements with high Et m± • W cross section: • sW*BR(Wmn) (nb) = 2.70±0.04stat±0.19syst ±0.26lum • Consistent with Run 1 results rescaled for higher energy: 2.41±0.08stat±0.15syst ±0.16lum (use Sterling et al. NNLO predictions) Nr. Candidates: - 4561 in 16 pb-1 Background: - QCD: 104 ± 53 - Cosmics: 73 ± 30 - Z mm: 247 ± 13 - Wtn: 145 ± 10 MT • R=s(Wmn)/s(Zmm)= 13.66±1.94stat±1.12syst • Consistent with Run 1 results F. Bedeschi, INFN-Pisa

  27. W  t n • Evidence for typical t decay multiplicity in W t n selections Back to index F. Bedeschi, INFN-Pisa

  28. Measurements with low Et m± 13 pb-1 • y trigger improved • pTm > 2.0 1.5GeV • Df > 5° 2.5° • Observed y rates are consistent with expected increase due the lowering of the thresholds No Silicon 100k y Centralmuons only 15 MeV with Silicon s = 21.6 MeV F. Bedeschi, INFN-Pisa

  29. Measurements with low Et m± • Inclusive B lifetime with y’s • Fit pseudo-ct = Lxyy*FMC*My/pTydistribution • Output: b lifetime, fraction of y from B • ct=458±10 stat. ±11 syst. mm (PDG: 469±4 mm) • y from B = 17% (pTy > 4 GeV) • Resolution function from large prompt component • R = narrow + wide Gaussian (19%) + exponential tails (1.2%) • Scale factor on error returned from vertex fit 1.069 ~ 46% Resolution function F. Bedeschi, INFN-Pisa

  30. Add B scale correction Tune missing material ~20% Correct for material in GEANT Raw tracks Measurements with low Et m± D0 • Use y’s to understand E-loss and B-field corrections • Check with other known signals U 1S 2S 3S F. Bedeschi, INFN-Pisa

  31. Measurements with low Et m± semi-leptonic B y(2S) • B masses: • y(2S)J/y p+p- (control) • Bu J/y K+ • Bd J/y K0* (K0*K+p-) • Bs J/y f (fK+K-) lifetime More mass plots s(CDF) s( PDG) CDF 2002DPDG/s y(2S) 3686.43±0.54 0.866.00 Bu 5280.60±1.70±1.1 0.774.05 Bd 5279.80±1.90±1.4 0.174.72 Bs 5360.30±3.80± -1.811.90 Bu 2.10 2.90 F. Bedeschi, INFN-Pisa

  32. Measurements with low Et m± BdyK*0 • More mass plots: • Bd, Bs Bsyf Back Back to index F. Bedeschi, INFN-Pisa

  33. Measurements with low Et m± # B+ ~ 154 • B+ lifetime: • B+ J/y K+ • Fit results: • ct=446±43±13 mm (D PDG/s = 1.2) • Res. scale factor 1.16 • Conservative systematic error Back Back to index F. Bedeschi, INFN-Pisa

  34. Measurements with inclusive leptons Back Back to index • Find large samples of semileptonic B decays F. Bedeschi, INFN-Pisa

  35. Measurements with jets • Raw Et only: • Jet 1: ET = 403 GeV • Jet 2: ET = 322 GeV F. Bedeschi, INFN-Pisa

  36. Measurements with jets • Expectations: • Increase max. energy reach • Study both central and forward • New physics is mostly central • Pdf’s affect both regions • Current work: • Accumulate large samples • Understand energy corrections • E-scale, jet shapes, MC tuning Central jets Run 1 Run 2a Run 2b Forward jets F. Bedeschi, INFN-Pisa

  37. Measurements with jets • Jet distr. from data • Raw ET • Each trigger rescaled for pre-scale factor Fixed cone algorithm: R = 0.7 F. Bedeschi, INFN-Pisa

  38. central calor. Plug region Plug region Hadronic Energy Scale • Use J/y muons to measure MIP in hadron calorimeters • (Run II)/(Run 1) = 0.96±0.005 q g g q • Gamma-jet balancing to study jet response • fb = (pTjet – pTg)/pTg • Run Ib (central): fb= -0.1980 ± 0.0017 • Run II (central): fb= -0.2379 ± 0.0028 • Plug region corrections in progress D fb = (4.0 ±0.4)% F. Bedeschi, INFN-Pisa

  39. Measurements with jets • Jet shapes: • Narrower at higher ET • Calorimeter and tracking consistent • Herwig modeling OK 16 pb-1 used for this study F. Bedeschi, INFN-Pisa

  40. Measurements with hadronic b triggers D0 K p ND=56320 10 pb-1 • L2 trigger on 2 tracks: • pt > 2 GeV • |D| > 100 mm (2 body) • |D| > 120 mm (multibody) • Swamped by D mesons! • But see B’s as well…. CDF Run 2 preliminary • Ds± - D± mass difference • Both D  fp (fKK) • Dm=99.28±0.43±0.27 MeV • PDG: 99.2±0.5 MeV • Systematics dominated by background modeling Ds+ D+ 2360 1350 F. Bedeschi, INFN-Pisa

  41. Measurements with hadronic b triggers(important Italian contribution) • Measure ratios of CKM suppressed decays • G(DKK)/G(DKp) = (11.17±0.48±0.98)% (PDG: 10.84±0.45) • Main systematics (8%): background modeling • G(Dpp)/G(DKp) = (3.37±0.20±0.16)% (PDG: 3.76±0.20) • Main systematics (4%): relative acceptance CDF Run 2 preliminary CDF Run 2 preliminary L = 10 pb-1 Signal: 5670 Signal: 2020 F. Bedeschi, INFN-Pisa

  42. Measurements with hadronic b triggers • D mesons: • What fraction from B? • D0: 16.4-23.1% • D*+: 11.4-20.0% • D+: 11.3-17.3% • Ds+: 34.8-37.8% Range of fract. from B using two extreme resolutions functions: -single gaussian - parametrization from K0S sample K0S Gaussian F. Bedeschi, INFN-Pisa

  43. Measurements with hadronic b triggers(important Italian contribution) #B+ = 56±12 • Hadronic B decays observed • Yield lower than expected (silicon coverage/SVT efficiency > x 3) • S/N much better than expected • Better S/N dilution compensates reduced statistics #B = 33±9 B  h+ h- B+ D0p+ F. Bedeschi, INFN-Pisa

  44. Conclusions on Tevatron and detector status • Tevatron is slowly improving • The CDF detector is fully functional and accumulating proton anti-proton data • Understanding of detector is advanced • Many early physics results • sometimes competitive in spite of limited statistics • Ready to exploit full Tevatron potential as luminosity increases F. Bedeschi, INFN-Pisa

  45. Run 2B Upgrades • Progetti, motivazioni e richieste complessive degli upgrades per il run 2B discussi in dettaglio nella riunione del Maggio scorso • Progetti che coinvolgono gli italiani • Nuovo tracker a microstrip (Padova, Bologna, Roma1) • Nuovo preradiator (Pisa [Siena], Roma1, Pavia) • Aggiunta di timing sui calorimetri elettromagnetici (LNF) F. Bedeschi, INFN-Pisa

  46. SVX IIB • Overall design complete • Basic element (stave) is near being built and tested F. Bedeschi, INFN-Pisa

  47. SVX IIB – The Stave Mini PC • 2 sensors/hybrid = 1 module • 3 modules/side • 1 MPC/stave • 1 readout unit/stave • Stave is 66 cm long Cooling tubes Mounts Chips Wing Cable Hybrid Pitch Adapter Sensors Mounting holes F. Bedeschi, INFN-Pisa

  48. SVX IIB • R&D advancing fast • All stave components available • SVX4 chip, Hybrid, detector, special cables, mechanics, mini-port-card • First functioning prototype in October 2002 SVX4 chip sensors Hybrid F. Bedeschi, INFN-Pisa

  49. Preshower F. Bedeschi, INFN-Pisa

  50. Preshower • Basic design understood • Important Italian group contributions to R&D • Optimization of tile performance • Simplification of tile construction • Current construction model: • Italian groups build basic tile for both preshower and crack chamber • R&D in progress to establish some design choices: • Best scintillator (Dubna/Bicron) • Best fibers (Kurarai/PoliHiTech) • Coupling of WS fibers F. Bedeschi, INFN-Pisa