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People

NSF Site Visit: Current Research Activities January 14-15, 2005 Young-Kee Kim The University of Chicago. People. Faculty: Young-Kee Kim Post-docs: Un-Ki Yang - looking for a faculty position Vadim Rusu - Fermi Fellow, started Oct. 2003 Ivan Furic - Fermi Fellow, started Apr. 2004

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  1. NSF Site Visit:Current Research ActivitiesJanuary 14-15, 2005Young-Kee KimThe University of Chicago NSF Site visit, Jan. 14-15, 2005 Young-Kee Kim, University of Chicago

  2. People • Faculty: Young-Kee Kim • Post-docs: • Un-Ki Yang - looking for a faculty position • Vadim Rusu - Fermi Fellow, started Oct. 2003 • Ivan Furic - Fermi Fellow, started Apr. 2004 • Chicago Graduate Students: • Wojtek Fedorko (2nd year) • Clarisse Kim (1st year) - will start June 2005 • Remaining Berkeley Graduate Student: • Adam Gibson (5th year) • Undergraduate Students: • Annie Malkus • Jen Hsin • Jon Walsh • Edmund Berry NSF Site visit, Jan. 14-15, 2005 Young-Kee Kim, University of Chicago

  3. CDF Co-Spokespersons • YKK(term duration from June 2004 to June 2006), Luciano Ristori (Pisa) • Responsible for scientific program of CDF • CDF is now over 800 collaborators, 12 countries, 62 institutions. • Organized into detector operations, offline operations, and upgrade project, and physics groups • appointing physics and operations leaders. • organizing CDF weekly meetings, collaboration meetings, executive board meetings • appointing godparent committees for all analyses (~40 committees) • special committees: e.g. physics prioritization, internal reviews, … • MOU negociation • primary contact with laboratory (particle physics, accelerator physics, computing, directorate), high energy community, funding agencies, media, … • …… • Being co-spokesperson means I am effectively at Fermilab full time. NSF Site visit, Jan. 14-15, 2005 Young-Kee Kim, University of Chicago

  4. Physics Groups, Publications Physics Groups Organization: • Internal review processes by godparent committees after results are approved by physics groups. • Status: • 2001: Run II began • 2003: 4 papers published • 2004: 18 papers published or submitted • 2005 goal: 40 papers QCD B Electroweak (W,Z + …) Top Exotic (New Phenomena) physics groups: analysis groups: common tools, issues: dilepton l+jets all hadronic mass Joint Physics Meeting: Tracking, e, m, t, g, b-tagging, jet calibration, … Publications: NSF Site visit, Jan. 14-15, 2005 Young-Kee Kim, University of Chicago

  5. CDF Status • Detectors/Triggers/Offline working extremely well • effort to keep them running smoothly - high L, beam accidents, aging,.. • Accelerators delivering record luminosities: > 1 x 1032 • Collaboration focused on analysis: • so far ~10% of Run II luminosity. Exciting time has yet to come! • Upgrades necessary to keep up with growing luminosity • Detectors: Preshower, EM timing (H. Frisch) • Triggers and DAQ • COT(Drift Chamber) TDC - H. Frisch • Level-1 COT Track Trigger • Level-2 Silicon Vertex Trigger - M. Shochet + YKK • Level-2 Decision - M. Shochet + YKK • Level-3 Trigger • Event Builder Strength of Chicago group is that we are all focused on success of CDF. NSF Site visit, Jan. 14-15, 2005 Young-Kee Kim, University of Chicago

  6. Level-2 Decision Upgrade • Trigger Rates: • Level 1 output ~ 25kHz • Level 2 output ~ 300 Hz • Level 3 output ~ 60 Hz • Level 2 critical to CDF trigger performance • rejection factor ~ 100 • Major upgrade to Level-2 Decision is being commissioned. • will be used as CDF “real” triggers starting March 2005. NSF Site visit, Jan. 14-15, 2005 Young-Kee Kim, University of Chicago

  7. Level-2 Decision Upgrade • Primary purpose - faster, modular, more flexible, more robust • Present: • One PC Board for every interface (6 kinds) - maintenance issues • Custom processor (alpha) + backplane (1990 technology) - slow • Chicago has played major role since conception. • Henry Frisch was instrumental in proposing the upgrade. • T. Liu (Fermilab) led the whole effort: Chicago, Fermilab, Penn,Helsinki • Chicago engineers (with T. Liu) designed and built boards (Pulsar: Pulser And Recorder) • Harold Sanders, Mircea Bogdan • Chicago Personnel (firmware design, simulation, commissioning, …) • Vadim Rusu (Fermi Fellow) • a leading postdoc for the full system and essentially 100%. • Wojtek Fedorko (grad. student) • Shawn Kwang (Shochet’s grad. student) NSF Site visit, Jan. 14-15, 2005 Young-Kee Kim, University of Chicago

  8. Level-2 Decision Upgrade Overview PC Pulsar pre-processors Central Trigger Distribution Muon L1 Muon L1 Tracks L1 Trigger decsion Merger Kwang SLINK L2toTS Cluster L2 CALO (Cluster/ IsoCluster) E Sums Rusu Fedorko SVT e, m, t, g, jet, missing Et, displaced track,…. Triggers formed by combinations in 10-30 ms Shower Max Merger Electron SVT All boards identical FPGAs reprogrammed for each system NSF Site visit, Jan. 14-15, 2005 Young-Kee Kim, University of Chicago

  9. Level-2 Decision Upgrade: Current Status • Full system installed • Muon board fully integrated into Level-2 decision. • Parasitic running until February for other boards. • Original schedule for installation was Summer 05 - well ahead of schedule NSF Site visit, Jan. 14-15, 2005 Young-Kee Kim, University of Chicago

  10. Responsibilities for Level-2 Trigger • Chicago group will have continuing responsibilities for CDF Level-2 trigger, especially as luminosity grows. • Responsible for • Firmware and trigger simulation • Operations • Monitoring the performances • Monitoring program: • Initiated and designed by V. Rusu • Collaborative effort: Rusu, Fedorko, Kwang with Penn, Fermilab. • Monitoring at board level and system level • Invaluable tool for commissioning and testing in beam NSF Site visit, Jan. 14-15, 2005 Young-Kee Kim, University of Chicago

  11. YKK Group’s Physics Program Top Mass SUSY Searches Bs Mixing NSF Site visit, Jan. 14-15, 2005 Young-Kee Kim, University of Chicago

  12. Initial Analyses (warm-up) on Run II Data (72 pb-1) • W, Z cross sections • PRL accepted, PRD under Collaboration’s review • Primary authors include G. Veramendi, YKK • Forward-Backward Asymmetry using e+e- events • PRD submitted • G. Veramendi (UCB Ph.D. 2003), A. Gibson, YKK, G. Lentdecker NSF Site visit, Jan. 14-15, 2005 Young-Kee Kim, University of Chicago

  13. Top Mass and Electroweak Symmetry Breaking • Worked on Precision Meas.s of MW and Mtop • Run Ia, Ib: W Mass • Run II: Top Mass • Top Mass: • Prior to co-spokesperson’s term, YKK was Top mass group co-leader • Pursuing two methods in lepton+jets channel • Template method • Use mass shapes generated by MC • Fit shapes to 0B, 1B, 2B-tagged events • Matrix Element method (A. Gibson’s Thesis) • Evaluate likelihood that event kinematics are top like NSF Site visit, Jan. 14-15, 2005 Young-Kee Kim, University of Chicago

  14. Top Mass (l+jets) - Template Method First Results: Summer 03 (B tags) 108 pb-1 UCB: E. Brubaker, A. Gibson Chicago: U.K. Yang, YKK Toronto: J.-F. Arguin, P. Sinervo May 2004 (B tags) 162 pb-1 E. Brubaker’s thesis (UCB Ph.D. 2004) Chicago: J. Adelman, U.K. Yang, M. Shochet, YKK Toronto: J.-F. Arguin, P. Sinervo August 2004 (0 + 1 + 2-B tags) 162 pb-1 Chicago: J. Adelman, E. Brubaker, U.K. Yang, M. Shochet, YKK with Toronto, Dubna, Fermilab 174.9 +7.1-7.7 (stat) ± 6.5 (syst) GeV NSF Site visit, Jan. 14-15, 2005 Young-Kee Kim, University of Chicago

  15. Top Mass - Template Method (Aug. 2004) Mtop = 177.2 +6.0-5.5 (stat) ± 7.1 (syst) GeV NSF Site visit, Jan. 14-15, 2005 Young-Kee Kim, University of Chicago

  16. Top Mass - Template Method (Publication) • Higher statistics (305 pb-1) • Much smaller uncertainty in jet energy scale (x2) - better understanding • calorimeter simulation (Undergrad: D. Hoffman - pion responses) • Detector (Undergrad: A. Malkus, UCB grad: A. Gibson - g-jet balance studies) • method in estimating uncertainties PRD draft written - being reviewed by godparent committee. The numbers and figures will be finalized in a few months. Un-Ki Yang is leading this effort. NSF Site visit, Jan. 14-15, 2005 Young-Kee Kim, University of Chicago

  17. SUSY Searches Expected # of events w/ 400 pb-1 by A. Malkus Mc = 60 GeV 100 GeV 150 GeV • Signature based search using like-sign dilepton • Include trilepton events (Chargino-Neutralino) - flagship analysis for discovering SUSY at Tevatron • V. Rusu with Penn and Fermilab • Results by Spring conferences • Stop searches • 2 photons + 2 jets + missing Et • A. Malkus(undergrad), YKK, with Liverpool • APS/DPF abstract submitted NSF Site visit, Jan. 14-15, 2005 Young-Kee Kim, University of Chicago

  18. Bs Mixing World limit: Dms > 14.4 ps-1 SM pred. (99% prob.): 15 < Dms < 27 ps-1 • Fully reconstructed Bs (all hadrons) • provide the greatest reach in Dms (Boost is known) • triggered by SVT • unique to CDF due to SVT and high bandwidth triggers NSF Site visit, Jan. 14-15, 2005 Young-Kee Kim, University of Chicago

  19. Bs and SVT Upgrade Ivan Furic (Fermi Fellow - started April 2004) Co-convener of B physics working group (BPAK). BPAK responsibilities tool development group for Bs mixing ++ Particle ID tools: TOF, dE/dx Tracking evaluation: L00, event primary vertex Review and bless common tools in analyses Foster development and evaluation of new & improved triggers (large effort) Clarisse Kim (Grad. Student - starting June 2005) Edmund Barry (Undergrad. - started Dec. 2004) Ultimate goal: Bs mixing SVT upgrade work by I. Furic (~50%) and E. Barry - see M. Shochet’s talk Data Analysis Goals by this Spring Done: Reconstructed Bs, B0, B± Dp signals Measured relative decay rates PRL under collaboration’s review Ongoing work: Measuring B0, B± lifetimes Measuring Bd mixing First Bs mixing limit for spring conferences NSF Site visit, Jan. 14-15, 2005 Young-Kee Kim, University of Chicago

  20. Hadronic B0, B±, Bs Decays to Dp (with MIT, INFN Padova) • First observation with large statistics • Understanding of spectrum composition, trigger modeling necessary for Bs lifetimes, mixing • Measure ratios of branching fractions First measurements (PRL draft under collab.’s review) Br(Bs Dsp) / Br(B0 D-p) = 1.38 ± 0.19 (stat.) ± 0.10 (syst.) ± 0.36 (Br) ± 0.10 (PR) Br(B+ D0p) / Br(B0 D-p) = 1.95 ± 0.10 (stat.) ± 0.14 (syst.) ± 0.14 (Br) Bs Dsp B0 D+p- NSF Site visit, Jan. 14-15, 2005 Young-Kee Kim, University of Chicago

  21. Towards Bs Mixing: B0, B± Lifetimes (with MIT, Cantabria) • Simultaneous unbinned likelihood fit for mass and lifetime • Difficulty: trigger and analysis selection sculpt ct distribution • Lifetime fits for B±, B0 lifetime in good agreement with world average B0 K+ppp ct (B0) = 454.4 ± 10.3(stat.) mm (PDG: 460.5 ± 4.2 mm) ct (B+) = 519.5 ± 12.7(stat.) mm (PDG: 501 ± 5 mm) NSF Site visit, Jan. 14-15, 2005 Young-Kee Kim, University of Chicago

  22. Towards Bs Mixing: Bd Mixing Measurement Bd (with MIT, Cantabria) • Add tagging information to lifetime distribution (SST tagger) • Fit for Bd mixing Dmd agrees with world average. Dmd = 0.59 ± 0.07(stat) ps-1 (PDG: 0.59 ± 0.07 ps-1) • Next step for Bs mixing: test fitter, calibrate taggers • Expected Bs mixing sensitivity by this spring (hadronic modes only): • 95% CL at Dms > 10 ps-1 (pessimistic), Dms > 20 ps-1 (optimistic) NSF Site visit, Jan. 14-15, 2005 Young-Kee Kim, University of Chicago

  23. Conclusion • Collider program has high potential for major discovery.. • Important to harvest results from previous large investment in CDF. • ~10% of luminosity so far - strong support over next 4 years critical. • Chicago group continues leadership role in CDF • hardware, physics, management • Quality and impact of group (post-docs and students) is very high. • Faculty actively engaged - important for CDF’s success. • Leads several high-profile analyses. • YKK group active in fundamental physics measurements • Top mass • Bs mixing • SUSY Chargino-Neutralino • YKK co-spokesperson through June 2006. • Planning to move to ATLAS after CDF spokesperson’s term ends. NSF Site visit, Jan. 14-15, 2005 Young-Kee Kim, University of Chicago

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