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The Heavy Flavor Physics Program at CDF

The Heavy Flavor Physics Program at CDF. http://www.physics.purdue.edu/~mjones/talks/mjones_Aug10_2005.ppt. Graduate Students. Matthew Jones (Assistant Professor) Gene Flanagan (New Postdoc) Kim Giolo (Advisor D. Bortoletto), Niharika Ranjan (Advisor M. Jones) Riei Ishizeki (Undergraduate).

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The Heavy Flavor Physics Program at CDF

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  1. The Heavy Flavor Physics Program at CDF http://www.physics.purdue.edu/~mjones/talks/mjones_Aug10_2005.ppt Graduate Students Matthew Jones (Assistant Professor) Gene Flanagan (New Postdoc) Kim Giolo (Advisor D. Bortoletto), Niharika Ranjan (Advisor M. Jones) Riei Ishizeki (Undergraduate) • Triggers and limitations • Trigger upgrade work • Particle identification • Physics program DOE Site Visit - Task G

  2. The CDF-II Heavy Flavor Program • Unique to CDF: • Hadronic trigger: 2 displaced tracks • Fully reconstructed B decays • Charm physics program • Lepton+displaced track (semileptonic decays) • Other important triggers for B-physics: • Two leptons (e+e- or +-) • Single lepton triggers DOE Site Visit - Task G

  3. Tevatron Performance Projections (Fermilab 2004 DOE Mini Review of Run II Upgrades) e-cooling observed (July 18) Stacktail cooling preparations Improved p production Peak luminosity (Aug 4): Weekly delivered luminosity is currently about 15 pb-1 Performance now exceeds projections Must prepare for DOE Site Visit - Task G

  4. CDF-II Trigger Limitations • Maximum Level 1 trigger rate: • Effectively limited to 27 kHz • Large fraction of rate from track triggers – many are fake • Level 2 processing time: • Slowest component is SVT • Dead time > 5% when L1 rate > 13 kHz • Requires pre-scaling level 1 triggers • Upgrade will allow L1 rates up to 23 kHz • Need to improve purity of Level 1 track triggers! DOE Site Visit - Task G

  5. Level 1 Track Trigger Patterns of hits in axial superlayers identify track segments Patterns of segments identify tracks at level 1 • High efficiency • Large fake track rate at high luminosity DOE Site Visit - Task G

  6. Level 1 Trigger Rates • Trigger rate as a function of luminosity: • terms result in unreliable extrapolations to high luminosity. “Fakes” Multiple interactions Physics cross section DOE Site Visit - Task G

  7. Level 1 Track Trigger Upgrade • Baseline XFT Upgrade: • Identify track segments in stereo superlayers • Confirm axial XFT tracks with additional stereo segments • New hardware: • XTC2 mezzanine card (UIUC) • Stereo finder module (Fermilab) • Stereo Linker Association Module (OSU) • Fiber installation (Baylor University) • Level 2 algorithms (UC Davis) • Purdue assumed responsibility of online integration and commissioning DOE Site Visit - Task G

  8. XFT Upgrade Configuration Ansley trigger cable (220 ft) Data @45MHz LVDS ~2 m copper Cable Data @33MHz (channel link) Neighboring cards connected over backplane ~10 m of cable to XTRP 168 TDC from COT axial layers 24+24 Axial Finders 24 SLAMs 24 Linkers XTC 3 crates 24 crates 3 crates New cable (~150ft) Optical Data ~45MHz 3d track data out. ~3m optical Cable @60.6MHz 12+12+12 Stereo Finders New TDC or XTC for stereo layers 2 crates Data to L2 DOE Site Visit - Task G

  9. Track Trigger Upgrade Commissioning • Integration and commissioning plan based on previous experience with Time-of-Flight • XTC2 mezzanine cards: • Integrated with the CDF-II DAQ system • Online calibration and offline analysis code • Now included in normal CDF-II data taking • Some failures identified through routine operation • Stereo finder and SLAM modules • Framework for integration with DAQ system • Provide several modes for testing, diagnostics and validation • Integration complete by early 2006 followed by commissioning/validation of new hardware DOE Site Visit - Task G

  10. New Level 1 Trigger Hardware • Full sensitivity of B0s mixing analysis obtained from fully reconstructed B-decays • Could exclude  ms < 25-30 ps-1 by 2009 • SLAM output allows new Level 1 triggers • Evolved over past year to include: • Fast list of tracks sent to Level 2 SVT trigger • Track fitting at Level 2 starts earlier • “Barrel Pointer” uses stereo track information • Drop tracks that don’t point into the right part of SVX-II • Shorter Level 2 execution time • Higher purity B-physics triggers: • Transverse mass  3D mass  Dedicated B0s trigger • Increase yield of fully reconstructed B0s decays DOE Site Visit - Task G

  11. New Trigger Hardware • Quantifying the benefits of new trigger hardware required new analysis techniques: • CDF Note 7356 (November 8, 2005) A Method for Extrapolating Trigger Rates to High Luminosities • Applied to hadronic B0s yield with new trigger hardware – also allows evaluation of luminosity leveling: • Fermilab-TM-2322-AD-E (May 2, 2005) Influence of Luminosity Leveling on the CDF-II B-Physics Program DOE Site Visit - Task G

  12. New Level 1 Trigger Hardware • Dedicated trigger for D+s + or BX • Can keep tracks with pT as low as 1.5 GeV • Exploit unique K+K- decay topology: • Two low pT tracks • Small opening angle • Exit detector with same z • 2.5 times the B0s yield compared with current trigger • Estimated L1 cross section: 13 b (2.6 kHz at L=200e30) • Require additional 2 GeV/c track within 120o • Further L1 trigger rate reduction DOE Site Visit - Task G

  13. Time-of-Flight Detector • Goal: 2 K- separation for pT<1.6 GeV/c • Achieved “100 ps” timing resolution goal • Working on precision measurements DOE Site Visit - Task G

  14. Time-of-Flight Detector Operations • Sub-project leader since 2001 (with G.Bauer, MIT) • Institutes currently involved: • MIT, INFN, Cantabria, University of Pennsylvania • Purdue: electronics, software, calibrations, organization (previously Penn responsibilities) • Inheriting responsibilities from other institutes: Tsukuba (2001) No resources from Penn after 2005 Korea (2003) MIT out in FY06 Reduced INFN • Purdue graduate students to help provide pager coverage and routine maintenance DOE Site Visit - Task G

  15. Time-of-Flight Reconstruction Purdue efforts continue to improve performance: • New clock translator module electronics built at Purdue • Installed January 2005, simplifies maintenance • Allows synchronization of TOF and CLC clock signals • Studies using photon transport Monte Carlo: • CDF Note 7620 (Jones, Ishizeki): Sources of Bias in Time-of-Flight Measurements • Precision alignment of the scintillator: • CDF Note 7693 (Jones): Deformations of the Scintillator in the Time-of-Flight System DOE Site Visit - Task G

  16. Heavy Flavor Analysis • B lifetime using fully reconstructed decays • Kim Giolo (thesis), Bortoletto (advisor) • K production associated with B0s fragmentation • M. Jones, with Denys Usynin and Joseph Kroll (Penn) • K production associated with D+s fragmentation • M. Jones, Niharika Ranjan thesis DOE Site Visit - Task G

  17. B lifetimes (Kim Giolo thesis, Bortoletto advisor – defended May, 2005) • SVT: Level 2 trigger on displaced tracks • Fully reconstructed B-decays • High statistics lifetime measurements: • 12130 B0 D,D3 candidates • 600 B0s Ds, Ds3 • Lifetimes significantly biased by the trigger • Results from spring ’05 using 360 pb-1: DOE Site Visit - Task G

  18. B0s-K correlations • Motivated by Same Side Kaon Tagging for B0s mixing: • Projections for D2 based on Pythia • Might be as large as 4% (TOF proposal) • Significant compared with opposite side tags: D2 = 1.6% • Need to quantify this for setting a limit or evaluating sensitivity • How well does Pythia describe the data? • Mostly concerned with kaons • Can’t measure dilution since B0s mixes • Compare particle yields around B-decays DOE Site Visit - Task G

  19. B0s-K correlations (with Denys Usynin – University of Pennsylvania thesis) • High statistics from semileptonic B decays • Use TOF + dE/dx to measure fractions of K,,p in a cone around candidate DOE Site Visit - Task G

  20. D+-K and D+s-K correlations (Niharika Ranjan thesis, Jones advisor) • Address many deficiencies of B0s-K analysis: • Much higher statistics • Can measure charge correlation directly • Fully reconstructed decays using D+,D+s+ DOE Site Visit - Task G

  21. Summary • Addressing challenges of good Tevatron performance: • Integration of Level 1 track trigger to be ready for data taking in 2006 • New Level 1 trigger hardware will maximize physics potential from hadronic B decays • Continuing contribution to CDF operations: • Time-of-Flight operations • Offline reconstruction and calibration development • Trigger analysis: planning for the future • Analysis making the most of these efforts: • Many use data sets based on hadronic triggers • Precision applications of particle identification DOE Site Visit - Task G

  22. Supplementary Material DOE Site Visit - Task G

  23. B0s Mixing Sensitivity See http://www-cdf.fnal.gov/physics/projections/ • Assumes improvements in tagging, mainly from Same Side Kaon Tag • Better vertex resolution (eg., reject some classes of SVX hits on tracks) • B0s yield depends on Tevatron performance, Level 1 track trigger, Level 2 SVT upgrades • Could exclude  ms < 25-30 ps-1 by 2009 • Does not include increase in statistics from new Level 1 triggers described here. DOE Site Visit - Task G

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