SLAC BaBar ProgramOverview

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SLAC BaBar Program-Overview
Gregory
Blair
Jochen
Matt
Jon
Blair Ratcliff SLAC BaBar Program Manager June
2006
Denis
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The BABAR Collaboration 11 Countries 80
Institutions 623 Physicists 46 Active SLAC
Physicists
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-B
arcelona 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 AM 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
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
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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)

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SLAC BaBar Manpower Distribution (FTE)
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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

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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?

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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 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?Xsg (1/06)
Tetiana Hrynova, 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). Current Students and Thesis
Topics Kevin Yarritu, Radiative Penguin Decays,
expected 2006 Mark Allen, CP Violation in B?p0
p0 Joshua Thompson, CP Violation and Dalitz
Analysis in B0?KK-Ks Andrew Wagner Andreas
Walker Wells Wulsin, B? r(w)ln Steven Sun
Chris West New Students Jose Benitez Manuel
Franco
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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 BaBars 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? Kg B? rg B? fg etc.
• ISR Exclusive hadronic final states Inclusive
  and exclusive measurements of R.
• Exclusive VV production in ee- collisions.
• Leptonic b c decays (e.g., B? t n(e n)(m n)
  D? mn Ds? mn (tn)
• Exclusive B decays B? pp-p, K, K B? hK
• See Thumbnails by Jochen, Jon, and Denis.

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SLAC BaBar Physics Leadership HistoryAWG/Tools/Ta
sk Force Convenors

• Charmless 2 Body Cristianziani
• Charmless 3 Body Dujmic, Graham
• Semileptonic Luth, Dingfelder
• Radiative Penquins Libby, Jessop, Convery
• Leptonic Decays Robinson, Schindler
• Pentaquark Halyo
• Inclusive Spectra Muller, Ratcliff
• Particle ID Aston
• Neutral Particles/Reco and ID Roodman

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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)

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IFR Upgrade (Barrel RPCs to LSTs)

• Jan. 03 Deteriorating performance of Barrel
  IFR RPCs leads to decision to replace with LSTs
  
• Oct. 04 First 2 sextants installed.
• 8/06-11/06 Final 4 sextants installed. Delayed
  to summer 06 by change in PEP schedule.

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2004 IFR Installation

• Installation of 12 layers of LSTs 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

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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
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LST Performance

• Single layer efficiency 91 (RPC 40)
• lt0.5 dead channels
• Muon-ID superior to 2000 RPC performance

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Summary

• SLAC BaBar
• Provides infrastructure, management, and
  technical support for detector and computing.
• Physics groups partner with the Collaboration on
  physics analysis, detector operations.

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L1 Trigger Upgrade (DCZ)
Entire Drift-Chamber Trigger system replaced
(except 1 BLT) to gain 3D tracking capability
using stereo wires.
ZPD

• 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
BLT
Full system physics run test July/04. Driving
BaBar L1 since start of Run 5
Institutions Bristol, Harvard, Iowa, Manchester,
Oregon, RAL, SLAC
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Bottom Line on L1 Trigger Rate

• Running since July 29, 2004.
• DCZ does its job just as well as we hoped
• Finding tracks and measuring z0 and pT
• How is this information used?
• ZPD can count tracks with cuts on z0 and 1/pT
• GLT can combine Z tracks with other trigger
  objects
• Its a balancing act
• Physics efficiency (which physics?) and
  robustness
• Maximum reduction of L1 trigger rate

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DCH Electronics UpgradeWhat 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

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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.