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Stato di CDF

Stato di CDF. 22 Settembre 2005 Giovanni Punzi (Pisa). Highlights. Run IIb upgrades completi all’85% Completamento previsto nella prima parte del 2006 SVT Upgrade 2/3 completo e operativo Nuovo record di luminosita’: 1.4 E32 (4 Agosto) 1 fb-1 su nastro (10 Settembre)

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Stato di CDF

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  1. Stato di CDF 22 Settembre 2005 Giovanni Punzi (Pisa)

  2. Highlights • Run IIb upgrades completi all’85% • Completamento previsto nella prima parte del 2006 • SVT Upgrade 2/3 completo e operativo • Nuovo record di luminosita’: 1.4 E32 (4 Agosto) • 1 fb-1 su nastro (10 Settembre) • Il rivelatore e’ stabile e funziona bene • Software di ricostruzione e’ stabile • La latenza tra la presa dati e la disponibilita’ dei dati processati per l’analisi e’ stata ridotta a ~ 6 settimane • Shutdown rimandato al 2006 (date ancora incerte) • Gli istogrammi accumulano statistica…

  3. 2002 2003 2004 2005 2002 2003 2004 2005 Record 1.4 x 1032 ~85% of Run IIb Upgrade Projects were commissioned with beam during this period. Data Taking Efficiencies Initial Luminosity (1030 cm-1s-1) Data Taking Efficiency 83%

  4. Recorded Data up to Aug. 2004 Recorded: 530 pb-1 Physics: 320 - 470 pb-1 Data up to Aug. 2005 Recorded: 950 pb-1 Physics: 620 ~ 880 pb-1 QCD Electroweak, Beyond SM B Top SM Higgs Sep-Dec ‘04 Shutdown COT Compromised Period Store Number (Aug.23,2005) Data for Physics

  5. Achieved vs Projected Integrated Luminosity On the path to 8 fb-1 integrated luminosity in 2009

  6. Top Line: all run II upgrades work Bottom line: none work Projected Peak Luminosity

  7. First e-cooling demonstration – 07/15/05 Pbar beam: 63.5e10 Barrier-bucket bunched. Bunch length 1.7-us Tr. emittance (95%,n) kept at 4-pi mm-mrad Electron beam current: 200 mA Traces are 15 min apart

  8. CDFII Challenge Continuare a raccogliere dati efficientemente a luminosita’ crescenti fino al 2009

  9. DAQ / Trigger Specifications

  10. L(1032) Lpeak = 3 x 1032 In 3.5 hours, L < 1.5 x 1032 66% 34% hours Physics Triggers a 3 x 1032 cm-2 s-1 • La Trigger Table attuale funziona bene fino a ~1.5 x 1032 cm-2s-1 • Significativo e continuo sforzo di miglioramento su molti fronti • Trigger upgrades: migliore purezza con meno processing time. • Alcuni prescale sono stati addirittura rimossi (multibody B trigger !) • Veto high multiplicity events • Trigger Table in sviluppo per ~3 x 1032 cm-2s-1 • 2/3 della statistica comunque raccolti a L<1.5 x 1032 • Strategy: high purity triggers for high luminosity, inclusive heavy flavor triggers at low luminosity (allow larger deadtime) • Straw Trigger Table in Ottobre 2005. • Scelta finale dei triggers basata su priorita’ di fisica e purezza • Importante contributo italiano anche qui.

  11. Run II Publication Status http://www-cdf.fnal.gov/physics/pub_run2/ • 2005 Goal: • 40 submitted papers • 2005 Status: • 20 submitted papers (9 published, 2 accepted) • 10 papers - drafts under collaboration’s review • Results approved by CDF physics groups • Drafts approved by internal reviewers • “Godparents committee” assigned for each paper. • 27 papers - under godparents committee’s review • Results approved by CDF physics groups

  12. B/charm physics Topics: Bhh (ACP, BR), Lbpp, BsDsp & lnDs (for Bs mixing), Blifetimes, Bsff, BdfK*, BfK (ACP, BR), D0hh (BR, ACP), D+πππ, pentaquarks, Groups involved: Padova, Pisa, Roma, Trieste High-pt physics Topics: Zbb, Higgs searches, top physics, hadronic top, top backgrounds, b-tagging, W+jets, forward W’s Groups involved: Bologna, Padova (Trento), Pisa, Roma Contributions to crucial analysis tools Computing, sample skimming Particle Identification with TOF and COT dE/dx High-Pt b-tagging development Jet Energy resolution and scale Most work in close cooperation amongst Italian groups A lot of work in close cooperation with non-Italian groups Italian group contributions to analysis Wide range of activities: today only a few highlights

  13. W+ b-jet n t t jet W- jet b-jet Mtop Current Best: Fit contemporaneo 2-D alla massa del top e alla scala dei jet (JES) da Mjj(W) nel campione lepton+jets Mjj(W) Prospects • W ->2 jets calibrano la scala dei jet negli eventi top stessi • Stessa scala per b-jet e light quark (per ora)

  14. Charmless BVV • BdfK*: yields 123 (CDF 360pb-1) (compare to 173 (Belle 250fb-1) [hep ex/050313] Equivalent uncertainty on polarization measurement Bsff:First observation with 180 pb-1 [PRL 95,031801 (2005)].Analysis update underway: 12 events  44 events (360 pb-1). • Update BR measurement. Measuring polarization: expect 0.10-0.15 resolution on long. polarization (similar to B-factory first PRL) estimated yield: 123 events estimated yield: 44 events BdfK* Bsff

  15. Verso la misura del Bs mixing • Le estrapolazioni assumono di integrare la meta’ della luminosita’ dal 2007 in poi (B-physics solo da meta’ store) • Sensibilita’ al range favorito dal fit di unitarieta’ • In case of no signal 95% C.L. up to 30 ps-1 with 4 fb-1

  16. ~70 physicists ( 22 italians, 9 phd/post-doc) in CDF are actively involved in the Bs mixing project Improving the trigger strategy Understanding the detector B Lifetime Measurements Flavor Tagging B0 Mixing Bs Mixing Big collaborative effort: Analyse 3 different datasets Reconstruct 0(20) different decay modes Perform 2 parallel analysis for both hadronic and semileptonic modes Study 4 different tagging algorithms TOF and dE/dx calibrations CDF “Bs Mixing Group” Here I mention just two examples of italian contribution

  17. Same side Kaon tagging • Exploits the charge correlation between the b quark and the leading product of b hadronization. Based on PID capability. • Big hopes: initial studies indicate D2~3% vs current ~1% B0 p-K*0 B- Measure K distr. in data Tune MC  D2 p+K+ Bs K- K*0

  18. Campione addizionale diBs semileptonici 2 displaced track trigger 4GeV-lepton + 1 displaced track trigger + • Additional new sample overlap with the one already used ~ 20% • Effective ~ X 3 more semileptonic Bs yield to be used for MIXING

  19. p K p Basic tools: PID • Moderate separation at CDFaccurate modeling is crucial • Great effort devoted both to TOF calibration (better resolution) + t0 (reduced tails) and COT dE/dx calibration over wide bg range • Central to many analyses: B reco, Flavor tagging Parameterize and combine TOF+dE/dx in a single likelihood  Maximal performance from a unified tool TOF dE/dx • J/ee, gee • J/mm • D*±D0ps(kp) ps • Lpp

  20. Charmless BPP • Update analisi in corso: 180 pb-1 360 pb-1 Total yield ~2600 ev (was 900) • Estimated yields: ~1600 BdK+p - ~400Bdp+p - • ~700 BsK+K- : (first observed w/ 180 pb-1) • Misura accurata BR (large U-spin breaking?) • CP state: Misura lifetime: ~light DGs • ?? BsKp Visibile… o contraddizione con la teoria. • Limite da 180 pb-1<5.4·10-6. Expect (6÷10)·10-6 • ?? Bspp , BdKKConstrain/misura contributi di annichilazione (BR(Bspp) piu’ grande, meno fondo piu’ sensibile. CDF ha gia’ il Best Limit da 180pb-1 ) ( 250 fb-1 BaBar) • 180 pb-1 • 360 pb-1

  21. Direct ACP(B0 K) CDF 180pb-1 HFAG 2005 Babar -0.133  0.030 (stat.)  0.009 (syst.) Belle -0.113  0.022 (stat.)  0.008 (syst.) • ACP compatible with B-factories, systematic uncertainty comparable • In progress: 360pb-1  (ACP)= 4% World best: 2.2% (Belle) • Full RunII statistics: (ACP) 1% • Other large direct ACP around the corner (unobserved modes!): • BsKπ (sensitive to , similar to Bdππ, but self-tagging) • bpπ 360 pb-1 ~650 pb-1 Lint

  22. Conclusioni • Il Tevatron sta seguendo le previsioni piu’ ottimistiche • Gli upgrades di CDF sono quasi completati • La collaborazione e’ impegnata a fondo nello sfruttare la luminosita’ per un ricco programma di fisica

  23. BACKUP

  24.  Back DGs / Gs • BS J/y fm+m- K+K- • BVV decays: Heavy and Light state decay with distinct angular distributions and different lifetimes. • Result (260 pb-1) • 1/4 heavy - 3/4 light state • Lifetime - theavy ~ 2 x tlight • DGS / GS = 0.71 +0.24-0.28 ± 0.01 • Lifetime difference measures “same” CKM element as Dm (oscillation frequency) • Exciting!! Need more data • ~ 5 % sensitivity by 2009 • Dms = 10 ps-1 DGS / GS= 7% • Test still possible CP violation effect in Bs mixing

  25. Bs KK • Perfect U-spin simmetry would predict BR(BsKK)/BR(BdKpi)~1, but some calculations predict  2[A. Khodjamirian et al.,Phys.Rev. D68 (2003) 114007]. • Current result favors the second case, but resolution is insufficient • Current resolution BR(BsKK)/BR(BdKpi)  1.70.31(stat.)more accurate measurement very desirable • Test with 360 pb-1 will be decisive: expect resolution 0.14(stat.) . 360 pb-1 Lint

  26. Silicon Detectors • Radiation damage • > 90% of total radiation is due to collisions: NIM A514, 188-193 (2003) • Bias voltage scans as luminosity accumulates • Study collected charge (hits on tracks) and mean noise • Measurements agree with predictions up to 1 fb-1. • Efforts to increase the Silicon lifetime • Lowered Silicon operating temp. gradually from -6oC to -10oC. • Thermally isolated SVX from COT inert regions such that the silicon can be kept cold during COT work. Predicted Silicon Lifetime (note the large uncertainties) 8 fb-1 Lifetime 0 10 fb-1 20 fb-1 30 fb-1 40 fb-1

  27. Run IIb Project Status • Trigger and DAQ Upgrades • Level-1 Track Trigger (XFT): • Add z (stereo) info for 3D tracking - In production • COT TDC modification to achieve L2 rate of 1000 Hz (readout time) • 12 out of 20 crates are operational. • Level 2 decision system: faster,flexible - operational since April 2005 • Level 2 Silicon Vertex Trigger (SVT) • Faster - 3 step upgrade: the first 2 steps are operational. • Event Builder: operational since August 2005 • Level-3 Computer • 1st procurement placed(64 PCs) - replace current system in Nov’05 • 2nd procurement ready(64 PCs) - complete ~Jan.06 • Data Logging (20 MB/s  60 MB/s) • 1st step operational (~35MB/s), complete by end of 2005 Installation & commissioning parasitically without interrupting operations.

  28. Run IIb Project Status • Detector (Calorimeter) Upgrades • Central Preshower upgrade • Replacing with a finer segmentation system for higher lum. • operational since early 2005 • Electromagnetic Timing • New system for cosmic ray rejection • operational since early 2005 • Run IIb Status • The project is ~85% complete and operational. • 100% by early 2006. • commissioned without interrupting operations.

  29. Extrapolation of Trigger Rates Bunch-by-bunch luminosity gives a better lever arm for the extrapolation. Level-2 high pT electron Level-2 high pT muon (0.6 < || < 1.1) a highly non-linear behavior ~50% bandwidth at 3 x 1032 cm-2s-1 ~1% bandwidth at 3 x 1032 cm-2s-1

  30. Example of planned improvements: XFT upgrade Confirmation of XFT tracks by stereo layers is expected to yield a substantial reduction of fakes

  31. Straw Trigger Table - Projected L2 Rates

  32. Straw Trigger Table - Projected L2 Rates Triggers for W, Z, Top, WH, ZH, HWW, SUSY (partial), LED, Z’ without XFT upgrade with XFT upgrade ~30% of bandwidth at 3x1032 cm-2s-1 Studying further improvement ~75% of bandwidth at 3x1032 cm-2s-1 No room for B & some of new phenomena

  33. Peak Luminosity = 3E32 34% 66% Inst. Luminosity (E32) hours Typical Projected Store Evolution

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