1. DOE Program Review, SLAC, June 2006 1 SLAC BaBar Program-Overview Blair Ratcliff SLAC BaBar Program Manager June 2006 Blair Gregory Jochen Matt Jon Denis

2. DOE Program Review, SLAC, June 2006 2 INFN, Perugia & Univ INFN, Roma & Univ "La Sapienza" INFN, Torino & Univ INFN, Trieste & Univ The Netherlands [1/4] NIKHEF, Amsterdam Norway[1/3] U of Bergen Russia[1/13] Budker Institute, Novosibirsk Spain[2/3] IFAE-Barcelona IFIC-Valencia United Kingdom [11/75] U of Birmingham U of Bristol Brunel U U of Edinburgh U of Liverpool Imperial College Queen Mary, U of London U of London, Royal Holloway U of Manchester Rutherford Appleton Laboratory U of Warwick USA[38/311] California Institute of Technology UC, Irvine UC, Los Angeles UC, Riverside UC, San Diego UC, Santa Barbara UC, Santa Cruz U of Cincinnati U of Colorado Colorado State Harvard U U of Iowa Iowa State U LBNL LLNL U of Louisville U of Maryland U of Massachusetts, Amherst MIT U of Mississippi Mount Holyoke College SUNY, Albany U of Notre Dame Ohio State U U of Oregon U of Pennsylvania Prairie View A&M U Princeton U SLAC U of South Carolina Stanford U U of Tennessee U of Texas at Austin U of Texas at Dallas Vanderbilt U of Wisconsin Yale Canada[4/24] U of British Columbia McGill U U de Montréal U of Victoria China[1/5] Inst. of High Energy Physics, Beijing France[5/53] LAPP, Annecy LAL Orsay The BABAR Collaboration 11 Countries 80 Institutions 623 Physicists 46 Active SLAC Physicists LPNHE des Universités Paris VI et VII Ecole Polytechnique, Laboratoire Leprince-Ringuet CEA, DAPNIA, CE-Saclay Germany[5/24] Ruhr U Bochum U Dortmund Technische U Dresden U Heidelberg U Rostock Italy[12/99] INFN, Bari INFN, Ferrara Lab. Nazionali di Frascati dell' INFN INFN, Genova & Univ INFN, Milano & Univ INFN, Napoli & Univ INFN, Padova & Univ INFN, Pisa & Univ & ScuolaNormaleSuperiore

3. DOE Program Review, SLAC, June 2006 3 Core Elements of SLAC BaBar Program Detector: Provide infrastructure, support, engineering and technical support, and management (Hassan) Computing: Provide infrastructure, support, and management (Gregory) Physicist Collaborators (SLAC BaBar) –Overview-Structure and Leadership (Blair) –Computing (Gregory) –Machine Detector Interface (Matt) –Physics Thumbnail Sketches (Jochen, Jon, Denis)

4. DOE Program Review, SLAC, June 2006 4 SLAC BaBar Manpower Distribution (FTE)

5. DOE Program Review, SLAC, June 2006 5 SLAC Physics Program Support Detector Operations & “Service” –(~0.6 of Active Physicist FTEs, ~2x nominal collaboration average) –Significant role in most detector systems, MDI, computing, etc. Detector and Computing Upgrades Physics Analysis (more later) Leadership –May 2006 –Collaboration Management Spokesman Technical Coordinator Computing Coordinator Council Vice Chair –Operations and Technical Operations Manager System Leadership & Technical Board –DCH –DIRC –EMC –IFR/LST –Trigger –MDI –Physics and Tools Convenors (6/45-May 06 Snapshot) Semileptonic Hadronic Spectra 3 body Charmless Neutral Particles Reconstruction and ID –Standing and Ad-hoc Committees Exec board; Speakers Bureau; Pub Board; Roadmap Committee; Membership Committee; etc.. Detector R&D

6. DOE Program Review, SLAC, June 2006 6 Physics Program Support-Education 10 Stanford Ph.D. Graduate Students (5/06). Research Associates –Typically 10-14 –How many do we turnover? 13 in last three years –Where are they now?

7. DOE Program Review, SLAC, June 2006 7 Graduated Students and Thesis Topics Hiro Tanaka, Radiative Decays of the B Meson (8/02). Aron Soha, Branching Fraction and Time-Dependent CP Asymmetry in Neutral B Decays to Psi and a Neutral Pion (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  X s  (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   (4/06). Nicolas Berger, Inclusive Measurement of RHAD with ISR events (4/06). Current Students and Thesis Topics Kevin Yarritu, Radiative Penguin Decays, expected 2006 Mark Allen, CP Violation in B      Joshua Thompson, CP Violation and Dalitz Analysis in B0  K + K - K s Andrew Wagner Andreas Walker Wells Wulsin, B   l Steven Sun Chris West New Students Jose Benitez Manuel Franco BaBar SLAC Ph.D. Students

8. DOE Program Review, SLAC, June 2006 8 Physics Analysis 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. E.g., there were 324 BaBar Analysis Notes last year. SLAC physicist was the lead editor on 45. Some examples of SLAC BaBar’s interests: –CP Violation in B   0  0 &, more generally, B  mm’ where m and m’ are charmless mesons. –Inclusive semi-leptonic B decays and the extraction of |V ub | & |V cb | –CP Violation and search for new physics in B   K s ; B  K + K - K s ; B  K L K s K s –Search for Exotic Baryons (Pentaquarks) –Search for narrow mesonic resonances (D s, X(3872), etc.) –Inclusive Hadronic Spectra;  K,p, ,  c,…………….. –Radiative Penguin decays; Inclusive b  s  Inclusive b  d    K*  ; B   ; B   ; 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   e  D   D s   –Exclusive B decays; B  p+p-      ’K* See Thumbnails by Jochen, Jon, and Denis.

9. DOE Program Review, SLAC, June 2006 9 SLAC BaBar Physics Leadership History AWG/Tools/Task Force Convenors Charmless 2 Body Cristianziani Charmless 3 Body Dujmic, Graham SemileptonicLuth, Dingfelder Radiative PenquinsLibby, Jessop, Convery Leptonic DecaysRobinson, Schindler PentaquarkHalyo Inclusive SpectraMuller, Ratcliff Particle IDAston Neutral Particles/Reco and IDRoodman

10. DOE Program Review, SLAC, June 2006 10 Future Challenges-as Lumi Grows Collaboration Manpower Base is ~static now, but…. –Ever larger data sets for Physics Analyses –Necessary Computing Capacity Growth –Luminosity/Background growth. –Pressure on total manpower as LHC draws closer, and experimental data taking ends.  At least flat (increasing?) need for SLAC operational support. Detector upgrades being completed with strong SLAC support to cope with increasing backgrounds at high lumi. –Trigger (running since 7/2004) –DCH Electronics (Phase III running since 11/ 2005) –IFR Barrel (first two sectors installed 2004. Installation to be completed by 11/2006)

11. DOE Program Review, SLAC, June 2006 11 IFR Upgrade (Barrel RPCs to LSTs) Jan. ’03: Deteriorating performance of Barrel IFR RPC’s leads to decision to replace with LST’s Oct. ‘04: First 2 sextants installed. 8/06-11/06: Final 4 sextants installed. Delayed to summer 06 by change in PEP schedule.

12. DOE Program Review, SLAC, June 2006 12 2004 IFR Installation Installation of 12 layers of LST’s and 6 layers of brass absorber Top and bottom sextants completed in ‘04 4 side sextants to be completed ‘06 QC during and after production, and after installation critical to good performance

13. DOE Program Review, SLAC, June 2006 13 Broad Participation across collaboration IFR Barrel Upgrade Responsibilities INFN: Ferrara, Frascati, Genova, Padova, Roma, Torino US: LLNL, Ohio State, Oregon, Princeton, SLAC, UCSD LST Tube Production and Factory QA; Front End Electronics; Installation Readout Planes; Module Assembly; Module QC; HV System; Cabling; Gas System; Installation

14. DOE Program Review, SLAC, June 2006 14 LST Performance Single layer efficiency 91% (RPC ~40%) <0.5% dead channels Muon-ID superior to 2000 RPC performance

15. DOE Program Review, SLAC, June 2006 15 Summary Summary SLAC BaBar: –Provides infrastructure, management, and technical support for detector and computing. –Physics groups partner with the Collaboration on physics analysis, & detector operations.

16. DOE Program Review, SLAC, June 2006 16 L1 Trigger Upgrade (DCZ) Institutions: Bristol, Harvard, Iowa, Manchester, Oregon, RAL, SLAC  8 new ZPDs ( Z-Pt-Discriminators ) for 3D tracking  24 new TSFs ( Track Segment Finders )  Interface cards ( at back of rack ): 24 TSFi, 8 ZPDi and 1 GLTi TSF ZPD BLT Entire Drift-Chamber Trigger system replaced (except 1 BLT) to gain 3D tracking capability using stereo wires. Full system physics run test July/04. Driving BaBar L1 since start of Run 5

17. DOE Program Review, SLAC, June 2006 17 Running since July 29, 2004. DCZ does its job just as well as we hoped –Finding tracks and measuring z 0 and p T How is this information used? –ZPD can count tracks with cuts on |z 0 | and |1/p T | –GLT can combine “Z tracks” with other trigger objects It’s a balancing act –Physics efficiency (which physics?) and robustness –Maximum reduction of L1 trigger rate Bottom Line on L1 Trigger Rate

18. DOE Program Review, SLAC, June 2006 18 DCH Electronics Upgrade What was the problem ? DCH waveform data shipping from front-end causes dead time (very non-linear!) In 2003 the problem was anticipated to become serious soon due to increasing luminosity and trigger rates SLAC involvement: Problem identification, solution recommendation, board redesign, QC. SLAC manpower: 5 physicists, 2 engineers, students Collaborating Inst: SLAC ISU, Notre Dame

19. DOE Program Review, SLAC, June 2006 19 Paths to solve it Phase I reduce sampling of raw waveform (32  16 bytes) Firmware change (PROM) on front-end board Fully implemented in Summer 2004 shutdown (2 weeks) Data quality is not compromised Phase II Run feature extraction in front-end, data reduction of factor 4 Needed board redesign including modified FPGA Full implementation during Oct/Nov ’05 shutdown. Deployed 2/06. Performing well. Single event upsets from neutrons at ~1/day by 12/05. Scheme for quick recovery implemented. As this might become a larger problem (20 functional upsets per day in 2007), in the longer term are aiming for redundant implementation/configuration checks.