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DOE REVIEW TASK C May. 14-16, 2007 WORK AT SLAC – Babar & ILC

DOE REVIEW TASK C May. 14-16, 2007 WORK AT SLAC – Babar & ILC. R. Prepost Faculty S. Dasu Faculty H. Band Senior Scientist K. Flood PostDoc

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DOE REVIEW TASK C May. 14-16, 2007 WORK AT SLAC – Babar & ILC

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  1. DOE REVIEW TASK C May. 14-16, 2007 WORK AT SLAC – Babar & ILC R. Prepost Faculty S. Dasu Faculty H. Band Senior Scientist K. Flood PostDoc M. Pierini PostDoc (Now CERN Fellow) Students J. Hollar Graduated (Now LLNL PostDoc) C. Vuosalo Started 6/06 M. Anderson Started 6/06 DOE Review 5/14-16/07

  2. Former Group Members • Erez Etzion, Scientist Professor Tel Aviv University • Francesca Di Lodovico Lecturer Queen Mary College, University of London • Ajit Mohapatra UW CMS Staff • Maurizio Pierini CERN Fellow • P. Tan Fermilab CMS PostDoc • J. Hollar LLNL CMS PostDoc • A. Eichenbaum DotCom Software Company Past Task C Collaborations • e+e- MAC Detector (PEP 1) SLAC • e+e- SLD Detector (SLC) SLAC • Polarized Spin Structure Functions SLAC Fixed Target E142, E143, E154, E155 DOE Review 5/14-16/07

  3. BaBar Physics Analysis BaBar System Work IFR Muon System Management BaBar Particle ID Muon ID/Neural Net Development ILC Polarized Photocathode R&D Source Laser Development Proposal for Muon System R&D KPIX ADC IC Testing Task C Activities DOE Review 5/14-16/07

  4. DOE Review 5/14-16/07

  5. ICHEP08 Double again from 2006 to 2008 Double from 2004 to 2006 ICHEP06 Projected data sample growth 20 Integrated Luminosity [fb-1] 17 12 Lpeak = 9x1033 DOE Review 5/14-16/07

  6. Babar AnalysesCompleted Theses DOE Review 5/14-16/07

  7. Babar Current Analyses Electroweak Penguins C. Vuosalo M. Pierini Co-Convener of Two-Body Charmless B Decay Analysis Group Group Published Babar Papers Penguin Analyses - 5 Papers UT Fit – 4 Papers RPC Detector - 4 Papers DOE Review 5/14-16/07

  8. DOE Review 5/14-16/07

  9. Papers • EichenbaumPRL 93, 21804 (2004); PRD 72, 052004 (2005). • Ping/DasuPRD 70, 112006 (2004); PRL 94, 011801 (2005). • HollarLepton Photon 05 Paper; PRD 73, 092001(2006). • Band (IFR) NIM A552, 27 (2005); NIM A539, 155 (2005); NIM A538, 801 (2005). • Prepost Appl. Phys Lett. 85, 2640 (2004). • Pierini JHEP 0603, 080 (2006); PRD 72, 051103 (2005); PRD 71, 111102 (2005); PRL 95, 011801 (2005). DOE Review 5/14-16/07

  10. DOE Review 5/14-16/07

  11. DOE Review 5/14-16/07

  12. RPC Management RPC Studies and Gas Chemistry Forward EndCap Upgrade Complete RPC Operations – Band and Students BaBar System Work - Band BaBar Particle ID –Flood/Band/Vuosalo • Muon Identification • K. Flood PID Group Co-Convener 2006 DOE Review 5/14-16/07

  13. Babar Near Term Plans 2007 (Analyses using 500 fb–1) • Complete D mixing analysis • Use complete dataset through 2007 (K. Flood) • Complete b  s l+ l– analysis including asymmetries • Improvements from NN m ID and reconstruction of several Xs final states, much like in Eichenbaum b  s analysis (K. Flood) • Continue Global analysis of CKM parameters • Add new results from BaBar and Belle (Completion of M. Pierini Work ) • Time dependent CP asymmetries (Pierini - Finish up Summer 07) • Update of B  K K K analyses • Update of B  K 0 analysis • New study of B  K +– analysis • Rare decays Finish B  l+l– analysis • Recoil technique to study difficult rare decays (C. Vuosalo) • Improve the technique to study, e.g., B  K and B  K  DOE Review 5/14-16/07

  14. Babar Long Term Plans > 2008 (Analyses using 800 fb–1) • Measure CKM parameters in rare decays • Continue to probe for deviations from Standard Model • Semi-inclusive b  s l+ l – • Improve ACP and forward-backward asymmetry zero-crossing point • Recoil method • Fully reconstruct one B to reduce backgrounds • Reduced signal statistics compensated by improved systematics • Cleaner samples of inclusive decays of the other B • Access to rare decays with neutrinos, Knn, Ktt DOE Review 5/14-16/07

  15. ILC Polarized Source • Proposal to ILC Accelerator R&D at Universities. DOE Awards FY04 FY05 FY06 of $34.6k/FY • Budget used for X-Ray Analysis, SIMS Analyses and Photoluminescence Hardware. • Group expands effort to include full electron polarized source system. DOE Review 5/14-16/07

  16. Components of Polarized Source R&D • Source Laser R&D • Photocathode Structures • Measurement of Photocathode Spin Relaxation Times: Faraday Rotation (new experiment & setup) DOE Review 5/14-16/07

  17. Polarized Source R&D Program DOE Review 5/14-16/07

  18. DOE Review 5/14-16/07

  19. Cathode Structure R&D DOE Review 5/14-16/07

  20. Faraday Effect Rotation to Measure Spin Relaxation Times • Prepare Pump/Probe Laser Pulses with Variable Probe Delay Time. • Pump with Circularly Polarized Light to Create Polarized Electrons in the Conduction Band. • Probe with Linearly Polarized Light Laser Pulse at Time t wrt Pump. • Measure the Rotation Angle of the Linear Polarization as a Function of time t. The Rotation Angle is Proportional to the Polarization. • A Series of Measurements will give P(t) and thus the Relaxation t. • Obtained a laser with femtosecond pulses to be able to measure picosecond values of t. DOE Review 5/14-16/07

  21. Faraday Rotation Laser DOE Review 5/14-16/07

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