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Data Taking Efficiencies

Data Taking Efficiencies

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Data Taking Efficiencies

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  1. CDFPerformance and ImprovementsDetectors, Triggers, Offline, and Analysis AlgorithmsCDF Collaboration

  2. Data Taking Efficiencies 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. Initial Luminosity (1030 cm-1s-1) Data Taking Efficiency Thanks to the Accelerator Div. Detector/trigger/DAQ downtime ~5% Beam Conditions, Start/end stores ~5% Trigger deadtime ~5%: our choice 83.5%

  3. Data for Physics Recorded Data up to Aug. 23, 2005 Recorded: 950 pb-1 Physics: 620 ~ 880 pb-1 Data up to Aug. 2004 Recorded: 530 pb-1 Physics: 320 - 470 pb-1 QCD Electroweak B Top Sep-Dec ‘05 Shutdown COT Compromised Period Store Number (Aug.23,2005)

  4. Spring-Summer ’05 Highlights (Data up to Aug. 2004) Top mass l+jets Z’ in ee CDF Run II Prelim. (448 pb-1) MtopCDF = 172.2 ± 3.7 GeV ~2% accuracy Mtop: 5 papers in preparation Z’: 1 paper in preparation hep-ex/0508051 CDF Run II Preliminary 95% CL Limit - 7.9 ps-1 (355 pb-1) (Semileptonic + Hadronic) Bs Mixing pub.: wait for better results MSSM Higgs in ’s: paper submitted

  5. Run II Publication Status http://www-cdf.fnal.gov/physics/pub_run2/ • 2005 Goal: • 40 papers submitted • 2005 Status: • 20 papers - submitted (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

  6. Current StatusandPreparation for Future

  7. CDF Detectors Performing very well. Even Run IIb Detectors! - Operational since early 2006

  8. CDF Detectors • Run IIb Upgrades: • Central Preshower Detector • Replacing with a finer segmentation system • Electron tagger, / separation • Installed fall 2004 • Electromagnetic Timing • New system for rejecting beam-halo and cosmic ray • Searches with  (e.g. GMSB SUSY, long-lived particles) • Installed fall 2004 For the future, tracking systems are our main concerns.

  9. Tracking Performance: COT and Silicon COT Gain vs. Time May 2004 Jan.2002 Aug.2005 • COT Aging - Fully Recovered • Aging due to hydrocarbons coating sense wires • Fixed by adding Oxygen • Fully recovered May 2004 • 99.7% working! • Silicon detector lifetime is a complex issue involving • Component failures • ~93% powered; ~84% working + 4% recoverable in offline • Secondary vertex trigger requires 4 layers: 21 out of 24 wedges • Beam incidents • lost ~2% of chips: conditions improved, but still concern • Long-term radiation damage

  10. 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 8 fb-1 Lifetime 0 10 fb-1 20 fb-1 30 fb-1 40 fb-1

  11. Offline Software & Computing Readiness

  12. Data Reconstruction CDF Run2 Prelim. L=790 pb-1 CDF Run2 Prelim. L=790 pb-1 Data up to July 20, 2005 Ave. inv. mass at Z peak [GeV] yellow band: ±0.5% E scale Run Number (up to July 20, 2005) M(e+e-) [GeV/c2] • Recently achieved 6 week turn-around time between data taking and availability of physics-quality data with final calibrations. • This reduced resource needs (person and computing). • Reconstruction algorithms are stable since January 2005. • Incorporated Run II detector upgrades. • No major changes anticipated in the future.

  13. Data Reconstruction • CDF Production executable is fast. • ~110 million events / week • 50 streams: high pT e, , , jet, Hadronic B, J/, J/  ee, …. • The ave. executable time increases by x2.5 from Lpeak = 1x1032 cm-2s-1 to 3x1032 cm-2s-1. We have already demonstrated this capacity. • Plan to process all the data until the end of Run II at Fermilab. Number of data events written to tape by Production Farm Aug 23 - Sep 3, 2005

  14. Monte Carlo Simulation and Production • Detector simulation reaching maturity - matching data • Incorporated detector configuration changes with time • Incorporated multiple interactions for data instantaneous luminosity • Increasing access to global computing resources (GRID philosophy) to match physics needs. • Running on worldwide computing clusters - shared with LHC • ~100% of MC samples are generated outside of US. • Planning data analysis centers at remote sites • Physics analyses produced with remotely located datasets • Italian inst.s, Karlsruhe: J/ lifetime, B tagging, Single top • Worldwide computing resources transparent to physicists. • Aim to support more computing with fewer FTEs

  15. Alignments, Calibrations, Algorithms

  16. Tracking and High pT Lepton Status • COT Tracking • Alignment: wire positions aligned better than 10 m • Efficiency: 99.6% (isolated tracks), > 96% (non-isolated tracks) • Silicon Tracking • Alignment: internal - 5 m, w.r.t. COT < 10 m • Efficiency: 94% with r-, 83% with r-and z • Misidentified: 0.5% - 1.5% • High pT Electron Identification • Efficiency: 82-93%, Misidentified jets: ~10-4 • High pT Muon Identification • Efficiency: 93%, Misidentified jets: ~10-4 • Numbers are stable with time, instantaneous luminosity up to 1032 cm-1s-1.

  17. Momentum and Energy ScaleStatus p p J/+- mass vs 1/pT p / p = - 0.0010 ± 0.0001 • Understand passive material well: • see E/p tail • Momentum scale: • flat over a large pT range. • MW uncertainty due to P, E scale • Run II current(Run Ib) • : 30 (87) MeV, e: 70 (80) MeV • better than Run Ib Data MC Simulation E / p of W electrons p / p = - 0.0013 ± 0.0001 1 / pT(GeV-1) +- mass (GeV) near Upsilon

  18. Forward Tracking and Lepton Improvements • Forward leptons • Acceptance improvements (e.g. 30% for SM Higgs) • Forward tracking, Forward electrons(used for many analyses) • Forward muons: • efforts in improving triggers and algorithms Electrons without tracks  > 90% up to || < 3 Electrons with tracks e.g. W charge Asym. Tracks Efficiency ||

  19. B and Tau Tagging: Status / Improvements 3rd generation is important: Top, Higgs, SUSY, … Hadronic Tau Better algorithms: Neural Network Sec. Vertex B Tagging Forward Evis(GeV) Jet mis-id (%) efficiency (%) Loose (1.8% mistag) Tight (0.6% mistag) Ejet (GeV) • Ongoing efforts: • Increasing efficiency / reducing fake rate (better algorithms) • increasing acceptance (forward region)

  20. EJet Scale & Resolution: Status / Improvements 0.2 1.0 0 Mhiggs = 120 GeV No corrections 17% resolution 0 50 100 150 200 250 0.2 1.0 0 Scale Corrections Resolution Improvements 0 50 100 150 200 250 • Jet energy scale uncertainty: • precision meas.s (Mtop), searches(Higgs) • now ~2.5% uncertainty for jets in top decays • further improvements: • generators, higher order QCD • better scale for ET > 100 GeV region • complete by end of this year • Jet energy resolution: • searches (Higgs, …) • currently 17%, goal 10-11% (jets from MW =120GeV) • further improvements: • combine track, calorimeter Info: 2% • expand cone size: 2% • b-jet specific corrections:1-2% • better algorithms: 1-2% • complete by spring 2006 10% resolution bb invariant mass (GeV)

  21. Algorithms for Bs mixing: Status / Improvements • Complex meas.s involving many detector systems and analysis tools • Triggering: optimized SVT algorithms • Reconstruction modes • Currently adding Bs Ds 3 (x1.5) • Will add Bs Ds* by summer 2006 • Currently adding Bs Dsl sample using SVT 2-track triggers (x2) • Tagging (D2) • e, , jet charge (1.5%) • Same-side K tagging in progress (~2%) • Decay length resolution • Improving vertex resolution by 10~20% for larger ms • Implementing into analysis by fall 2005 • Reducing systematic uncertainties by fall 2005 • Hadronic modes - better calibration in flavor tagging • Semileptonic modes - better understanding of backgrounds

  22. High Lum. Impact on Reconstruction / Physics Understanding Tracking, B-tagging Performance at 3 x 1032 cm-2s-1 < # of interactions > ~ 10 Data vs primary vertices vs bunch-by-bunch lum. MC + multiple interactions Work in progress Developing Analysis Techniques W Mass Tracking performance vs. # vertices Z  ee events 7 8 9 10 0.2 x 1032 cm-2s-1 1.0 x 1032 cm-2s-1 2.0 x 1032 cm-2s-1 3.0 x 1032 cm-2s-1 MTW pTlepton

  23. Run IIb Trigger / DAQ Upgrades • Instantaneous Luminosity: 2 x 1032 cm-2s-1 (IIa)  3 x 1032 cm-2s-1 (IIb) • Ave # of interactions = 10, more hits / event • Level-1: Tracking Triggers • low pT tracks + hits from extra interactions mimic high pT tracks • Lower purity  higher Level-1 trigger rate • Upgrade: 2D to 3D tracking  high purity and lower rate • Level-2: Decision System and Secondary Vertex Trigger • Upgrade: Lower processing time  higher bandwidth, more flexible • DAQ, Level-3 computing, Data Logging: • Upgrade: higher bandwidth + event size increase

  24. DAQ / Trigger Specifications • Run IIa Level-1 Accept not achieved due to • higher than specified Silicon Readout and Level-2 Trigger execution times. • ** Assume ~5% from readout and ~5% from L2 processing

  25. 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 Computing Farm • 1st procurement(64 PCs) in place-replace current system in Nov’05 • 2nd procurement(64 PCs) - ~Jan.06 • Data Logging (20 MB/s 60 MB/s) • 1st step operational (~35MB/s), complete by end of 2005 Installation & commissioning parasitically with minimal impact on operations.

  26. Run IIb Upgrade Status • Very successful so far: • 85% complete • Will finish by early 2006 • Upgrade success due to: • Highly successful Run IIa detector/trigger design & operation • Carefully targeted to specific high luminosity needs • This allowed for incremental and parasitic implementation and commissioning with minimal impact on operations. • Some cases (e.g. COT TDC), instead of building new detectors, we gradually improved the systems.

  27. Physics Triggers for 3 x 1032 cm-2s-1

  28. Extrapolation to 3 x 1032cm-1s-1 Average luminosity (36 bunches) Bunch-by-bunch luminosity • Triggers are sensitive to multiple interactions. • Measure cross section vs # of primary interaction vertices. • Calculate cross sec vs lum. using Poisson distribution of # of primary vertices. • Good agreement with bunch-by-bunch data. Level-2 high pT electron Level-2 high pT muon (0.6 < || < 1.1) a highly non-linear behavior Stereo confirmation of tracking triggers trigger rate = cross section x L at 3 x 1032 cm-2s-1 ~3% of Level-2 bandwidth ~50% of Level-2 bandwidth. Reduce to ~10 % with XFT upgrade

  29. Extrapolation to 3 x 1032cm-1s-1 Cross sections of high pT triggers (high pT e,,,jet,ET) with Level-1 upgrade Covers W, Z, Top, WH, ZH, HWW, SUSY (partial), LED, Z’ ~1/3 of Level-2 bandwidth at 3x1032 cm-2s-1: studying further improvements Studied triggers for “full” high pT physics program: ~2/3 of bandwidth. Aim for 50% of bandwidth

  30. Physics Triggers at 3 x 1032 cm-2 s-1 • Trigger Table in current operations is good to ~1.5 x 1032 cm-2s-1 • Kept improving as luminosity increases. Significant efforts! • Trigger Table for ~3 x 1032 cm-2s-1 • high pT physics program - aim for 50% • The remaining bandwidth will be given to B physics • Strategy: Developed high purity triggers for high luminosity while keeping inclusive heavy flavor triggers at low luminosity. • Level-1,2 upgrades improve purity, reduce processing time. • Other tools being implemented: • vetoing high multiplicity events • Final decision on the trigger composition • based on physics priority and purity of triggers • Straw Trigger Table ready by October 2005. L(1032) Lpeak = 3 x 1032 In 3.5 hours, L < 1.5 x 1032 66% 34% hours

  31. Concluding Remarks: CDF Strategies

  32. Concluding Remarks • CDF experiment is operating well. Better than ever! • Typical data taking efficiencies in the mid 80%’s with increasing inst. Luminosity and Run IIb commissioning • All detectors are in excellent conditions • Stable offline software • Established fast calibrations, data processing scheme • Good detector simulation • MC production at remote sites • Challenging ahead… • x2 higher instantaneous luminosity • x8 higher integrated luminosity • Resources going down • CDF Strategies in preparation for the future • Planning ahead: we have been identifying those areas that need further development and are beginning to address them immediately. Goal is to complete the work by early 2006.

  33. Concluding Remarks (cont.) • To be done by the end of 2005 or early 2006 • Complete Run IIb upgrades (~85% currently operational) • Expected to be done by the end of this year. • Physics trigger table up to 3 x 1032 cm-2s-1 being prepared. • Straw Trigger Table by October 2005 • Tuning simulation • Need one more iteration for analyses with L > 1 fb-1 • Calibrations and algorithms that require large resources • Reducing Jet energy scale uncertainty • Need one more iteration for analyses with L > 1 fb-1 • Implementing algorithms for better Jet energy resolution • Improving forward tracking and B tagging • Preparing reconstruction algorithms for high inst. Lum. • Tracking • B tagging

  34. Concluding Remarks (cont.) • Looking forward to Summer 2006 conferences • Results with x3 increase in statistics over Summer 2005 • Report on > 10 x Run I Luminosity !! • The upcoming years will be an exciting time with increasing statistics • Discovery through searches • Discovery through precision experiments • CDF Experience: • With ~4 pb-1, Top limits set • With ~20 pb-1, Evidence paper out! • With ~65 pb-1, Discovery paper out! • Hoping for new discovery with ~1 fb-1 • New physics could appear with every factor of 3~4. • CDF is committed to operating well and analyze the data through 2009.

  35. Back-up Slides

  36. Upgrading Silicon Vertex Trigger (SVT) Run 203624 Sep.1 2005 3 step upgrade: first two steps complete and operational As expected, core of timing stays the same, but tails are significantly reduced. Bigger improvements expected later. Run 203325 Aug.26 2005 SVT processing time (s)

  37. Future B Triggers • Current B triggers • High bandwidth tracks and leptons at L1, followed by SVT at L2. • What we’ve done so far • Developed high purity triggers for high lum, while keeping inclusive heavy flavor triggers at low lum. • 2 tracks - vetoing high multiplicity events • Transverse mass requirement • 2 tracks +  • For the future • XFT (L1) and SVT (L2) will improve purity and reduce L2 processing time. • Multi track combination - dedicated+track trigger. • Kinematic variable requirements with stereo information at L2. • Upgraded L2 decision is extremely flexible (firmware). • B program will not be fully active at peak lum, but we will continue to accumulate large hadronic B samples throughout the life of CDF.