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SLAC BaBar Program-Overview

SLAC BaBar Program-Overview. Blair Ratcliff SLAC BaBar Department Head. Core Elements of SLAC’s BaBar Contributions. Detector : Provide infrastructure, support, engineering, technical support, and management ( see talk of H. Jawahery) now moving to D&D (see D&D Session-Wisniewski& Krebs)

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SLAC BaBar Program-Overview

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  1. SLAC BaBar Program-Overview Blair Ratcliff SLAC BaBar Department Head SLAC Annual Program Review

  2. Core Elements of SLAC’s BaBar Contributions • Detector: Provide infrastructure, support, engineering, technical support, and management (see talk of H. Jawahery) now moving to D&D (see D&D Session-Wisniewski& Krebs) • Computing: Provide infrastructure, support, and management (G. Dubois-Felsmann) • Physicist Collaborators (SLAC BaBar) • Overview-Structure and Leadership (Blair) • Physics Sketches: SLAC Annual Program Review

  3. Status of the Collaboration-H. Jawahery 74 Institutions in 10 countries Although fewer BaBarians than last year, with more than 200 students and postdocs the collaboration continues to be on a very strong foundation. SLAC Annual Program Review

  4. Overview of SLAC BaBar Manpower – FY2008&2010 SLAC Annual Program Review

  5. SLAC BaBar Physics Manpower by Year (FTE) SLAC Annual Program Review

  6. SLAC Physics Program Support • Detector Operations & “Service” until the shutdown • (~0.6 of Active Physicist FTEs, ~2x nominal collaboration average) • Significant role in most detector systems, computing, etc. • Moving to minimal maintenance and D&D phases • Computing Support is evolving rapidly. • Online personnel moving to other roles in BaBar or positions in SLAC • Substantial offline support remains essential, but evolving. • Physics Analysis (more later) • Leadership – Snapshot as of May 2008 • Collaboration Management • Technical Coordinator • Computing Coordinator • Council Chair • Operations and Technical • Operations Manager • System Leadership & Technical Board (Transition to Maintenance and onto D&D) • DCH • DIRC • EMC • IFR/LST • Trigger • MDI • Physics and Tools Convenors (7/42-May 08 Snapshot) • Quarkonia • Hadronic Spectra • 2 body Charmless • 3 body Charmless • Semileptonic • Charm • Neutral Particles Reconstruction and ID • Standing and Ad-hoc Committees • Exec board; Speakers Bureau; Pub Board; Membership Committee; etc. SLAC Annual Program Review

  7. BaBar Detector • Shift in data taking goals for run 7 • Challenges in many areas, especially accelerator, trigger & DAQ, online, and computing  Successful U(3S), U(2S), and above U(4S) scans. • The end of an era- last run completed April 7. • BaBar now in a transition period to the Minimum Maintenance State (~Sept 1). • Completing the development of appropriate monitoring system • Ownership of detector in transition  SLAC responsibility • Minimum Maintenance State  D&D. SLAC Annual Program Review

  8. BaBar Computing • Expect delivery of the final data set about the end 2008. • Need to support ~2 more years of full-scale analysis with extensive central computing activities • Includes analysis, 2-3 skim cycles per year, and substantial simulation production. • Can do if we retain infrastructure in place now, including at SLAC, Tier-A sites and the network of simulation hosts. • Assumes retention of resources at Tier-A sites, network of simulation hosts • “Ramp-down” period begins in 2010….remaining analysis should converge at SLAC • Total need should be similar to current SLAC-only capacity in 2011, then decline fairly rapidly • Continued (diminishing) support is needed for several more years • For the long term need a system for archiving datasets and providing accessibility for analysis; will begin real engineering once reprocessing started SLAC Annual Program Review

  9. Physics • Well into the U(4S) intense analysis period (9 months ahead of schedule). • Have a rich new dataset in the broader Upsilon region in addition to the U(4S). • Top priority now is to publish the “core” analyses with the full dataset. • It will take substantial effort, and long term commitment to tap the full potential of the data. SLAC Annual Program Review

  10. SLAC BaBar Physics Analysis • Fully collaborative physics analysis model….. across institutions and groups. • Broad program. Many different “key” results. • SLAC is full participant in all phases of the physics. E.g., there were 198 BaBar Analysis Notes in the last 3 months. A SLAC physicist was the lead editor on 24. • Some examples of SLAC BaBar’s interests: • CP Violation in B p0p0 &, more generally, B mm’ where m and m’ are charmless mesons. • Inclusive semi-leptonic B decays and the extraction of |Vub| & |Vcb| • CP Violation and search for new physics in B fKs; B K+ K-Ks ; B KLKsKs • Search for Exotic Baryons (Pentaquarks) • Search for narrow mesonic resonances (Ds, X(3872), etc.) • Inclusive Hadronic Spectra; p,K,p,f, h, Lc,…………….. • Radiative Penguin decays; Inclusive b sg; Inclusive bdg ; B K*g; B rg; B fg; etc. • ISR; Exclusive hadronic final states; Inclusive and exclusive measurements of R. • Exclusive VV production in e+e- collisions. • Leptonic b & c decays; (e.g., B t n(e n)(m n) ; D mn; Ds mn (tn) • Exclusive B decays; B p+p-p, K, K*; B h’K* • CP violation in r+r- B decays • Determination of Hyperon Spins. SLAC Annual Program Review

  11. SLAC BaBar Physics Leadership HistoryAWG/Tools/Task Force Conveners • Charmless 2 Body Cristianziani, Roodman • Charmless 3 Body Dujmic, Graham • Charm Coleman • Semileptonic Luth, Dingfelder • Radiative Penquins Libby, Jessop, Convery • Leptonic Decays Robinson, Schindler, Nelson • Pentaquark Halyo • Inclusive Spectra Muller, Ratcliff • Particle ID Aston • Neutral Particles/Reco and ID Roodman • Quarkonia Grenier • Presently comprise 6/24 Physics AWG conveners SLAC Annual Program Review

  12. Physics Program Support-Education • 10 Stanford Ph.D. Graduate Students (5/08). • Research Associates • 10 • How many do we turnover? 20 in last five years. SLAC Annual Program Review

  13. BaBar SLAC Ph.D. Students Graduated Students and Thesis Topics Hiro Tanaka, Radiative Decays of the B Meson (8/02). Aron Soha, Branching Fraction and TDCPA in B0 Decays to Psi and a p0 (5/03). Amanda Weinstein, Study of Exclusive Charmless Semileptonic Decays of the B Meson (12/04). Erkcan Ozcan, Measurement of Inclusive Radiative B Meson Decay BXsg(1/06) Tetiana Hryn’ova, Study of B Meson Decays to p anti-p h Final States (3/06) Joerg Stelzer, A Precise Measurement of Dsmn (4/06). Nicolas Berger, Inclusive Measurement of RHAD with ISR events (4/06). Mark Allen, Measurement of Alpha in Bp0 p0, p+p0, and K+p0 (2007) Current Students and Thesis Topics, if known. Kevin Yarritu, Radiative Penguin Decays Mark Allen, Measurement of Alpha in Bp0 p0, p+p0, and K+p0 (2007) Joshua Thompson, Measurement of Beta in the Dalitz Analysis of B0K+K-Ks Andrew Wagner, Dalitz Analysis of B0K+p-p0 Brian Lindquist, Asymmetries in Three Body Decays Manuel Franco Sevilla B to D*tnDecays Wells Wulsin, B r(w)ln Steve Sun, e+e-  V V Chris West, Search for eta-b in inclusive upsilon(3S) decays Jose Benitez, A study of D*npi final states and a search for new excited charm states SLAC Annual Program Review

  14. Future Challenges For SLAC BABAR • Collaboration Manpower Base is slowly decreasing, with…. • An intense “Intense Analysis” period underway. • Uniquely large data sets for Physics Analyses on > 100 different topics. • Need to exploit the full data sets with methodological improvements for final archival analyses and publications. • Need to retain flexibility to include new physics channels and classes of events not previously envisioned. • Need to retain simulation capability and data accessibility for the long term • Increasing pressure on total manpower as LHC begins, now that experimental data taking has ended. • Continued need for substantial computing support during Intense Analysis phase (FY2008-2010). • Support for Maintenance and Detector D&D • (Fy2009-2014?) Retain simulation, data accessibility, and analysis capability to fully exploit the unique data set for physics. SLAC Annual Program Review

  15. Summary • SLAC BaBar: • Has provided infrastructure, management, and technical support for detector and computing for the life of the experiment. • Moving to Minimal Maintenance Phase for Detector and on toward D&D. • Significant support required for computing during intense analysis phase, decreasing thereafter, but becoming centered at SLAC. • SLAC BaBar Physicists partner with the Collaboration on physics analysis, & computing. Substantial computing and analysis efforts will be needed to mine and publish results from the very rich data set for both the intermediate and longer terms. SLAC Annual Program Review

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