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F1 Contribution to ILC Vertex Detector

F1 Contribution to ILC Vertex Detector. Tobias Haas 23 Febuary 2005. Linear Collider Basics. LEP gave ~ 1 fb -1 /expt. in 11 years, with 10 7 Z 0 LEP1 At √s = 500 GeV one needs 500 fb -1 to get: ~ 30,000 Zh 120 ~ 50,000 h 120 νν 10 6 W + W -

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F1 Contribution to ILC Vertex Detector

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  1. F1 Contribution to ILC Vertex Detector Tobias Haas 23 Febuary 2005

  2. Linear Collider Basics • LEP gave ~ 1 fb-1 /expt. in 11 years, with 107 Z0 LEP1 • At √s = 500 GeV one needs 500 fb-1 to get: • ~ 30,000 Zh120 • ~ 50,000 h120νν • 106 W+ W- • At √s = 1000 GeV one needs 1000 fb-1 to get: • ~ 6,000 HA (300GeV) • ~ 3,000 h500νν • ~ 2,000 WWνν (if no Higgs) • Need lots of luminosity to scan multiple thresholds, vary polarisation, go to γγ, e-γ, e-e- Tobias Haas: Physics at a Future Linear Collider

  3. Detector Considerations • Vertexing: • Flavour tagging with high purity and efficiency • Tracking: • Momentum resolution to measure recoil masses • Calorimetry: • Good segmentation and excellent EM energy resolution Tobias Haas: Physics at a Future Linear Collider

  4. VXD for Heavy Flavour Identification • Flavour couplings of Higgs are basic to test SUSY scenarios: Many have different +2/3 vs. -1/3 couplings. b vs. c best hope. • 5 layers with 800 Mio pixels. Innermost layer at 1.5 cm • 0.03% X0/layer Tobias Haas: Physics at a Future Linear Collider

  5. Visions of a VXD • 5 Layers • 20 x 20 m2 pixels • Sensor thickness < 60 m • 799 Mpixels • Readout time 50 s This is a major R&D project

  6. Topics of VXD R&D • Sensor technology ← DESY • Efficiency, S/N, cost, ease of use, speed, radiation tolerance, environmental constraints • DAQ • Thinning ← DESY • Support, Cooling ← DESY • Detector design and integration ← DESY DESY/F1 activities started already in 2001

  7. Some Example Activities • Topic 1: • Best possible VXD vs. What do we need to do the physics? • Topic 2: • Develop a sensor technology that does the job. • Topic 3: • How do we put sensors together to make a real detector? Tobias Haas: Physics at a Future Linear Collider

  8. Some Example Activities • Topic 1: • Best possible VXD vs. What do we need to do the physics? • Topic 2: • Develop a sensor technology that does the job. • Topic 3: • How do we put sensors together to make a real detector? Tobias Haas: Physics at a Future Linear Collider

  9. Introduction • Goal: • Optimization of design parameters for VXD: • Support, sensor thickness, overlaps, layer spacing… • Special considerations for specific technologies: MAPS, CCD, DEPFET • Placement of readout • Power, etc. • Steps • First • Explore many configurations quickly • Moderate Accuracy • Full physics capabilities • Second • Verify results with a high precision tool  SGV MVD Meeting, 11/11/2003, Tobias Haas, DESY

  10. Optimization Parameters • What should be the optimization parameters? • e.g. Tagging Efficiency… • … or effective error on some physics process? S. Xella-Hansen et al. LC-PHSM-2003-061 • ΔM ? MVD Meeting, 11/11/2003, Tobias Haas, DESY

  11. Detector Optimization using a Complete “Toy” Analysis • Requirements: • Physics Generators • Fast Simulation (SGV) • Reconstruction/Analysis Suite • Tracking • EFOs • Jet Finders • Vertexing • Flavor Tagging • … More or less covered by SGV Not covered by SGV (ZVTOP) MVD Meeting, 11/11/2003, Tobias Haas, DESY

  12. Contribution of V. Adler • V. Adler has latched b-tagging used in Brahms onto SGV • Not a completely trivial procedure: • Refit the resolution function to match the data set • A number of numerical issues (mostly evaluation of integrals) • Extend range of “Joint-Probability” tag to cover impact parameters significances up to 200 • Tune the definition of which tracks enter into the ZVTOP procedure • … get all coordinate transformations right! MVD Meeting, 11/11/2003, Tobias Haas, DESY

  13. B-tagging • 4 algorithms classify jets: • Impact parameter joint probability tag • “tear down” vertex finder • “most significant” tracks in the jet • ZVTOP • NN gives three tagging outputs • B tag • C tag • B/C distinction tag MVD Meeting, 11/11/2003, Tobias Haas, DESY

  14. Example ntuple thanks to Stefania Xella-Hansen MVD Meeting, 11/11/2003, Tobias Haas, DESY

  15. Contribution of Pawel Łuzniak MVD Meeting, 11/11/2003, Tobias Haas, DESY

  16. MVD Meeting, 11/11/2003, Tobias Haas, DESY

  17. MVD Meeting, 11/11/2003, Tobias Haas, DESY

  18. Finally: Use for Detector Optimization Studies: • Note: Result is compatible with results by T. Kuhl using SIMDET MVD Meeting, 11/11/2003, Tobias Haas, DESY

  19. Some Example Activities • Topic 1: • Best possible VXD vs. What do we need to do the physics? • Topic 2: • Develop a sensor technology that does the job. • Topic 3: • How do we put sensors together to make a real detector? MVD Meeting, 11/11/2003, Tobias Haas, DESY

  20. Sensor Technology Choices • MAPS (monolithic active pixel sensor) • Integrated R/O and sensor in CMOS • Piggy-back on commercial developments • Key Player: IRES Strasbourg • CCD • Long experience (SLD), large devices • Piggy-back on other scientific CCD development (Astronomy, synchrotron rad) • Key Player: RAL • DepFets • Thick active volume (Depletion voltage!) • Looks promising also for X-ray detection • expensive • Key Player: (MPI Munich) • SOI (Silicon on Insulator) • Great interest emerging recently • Key Player: Cracow MVD Meeting, 11/11/2003, Tobias Haas, DESY

  21. MVD Meeting, 11/11/2003, Tobias Haas, DESY

  22. MVD Meeting, 11/11/2003, Tobias Haas, DESY

  23. MVD Meeting, 11/11/2003, Tobias Haas, DESY

  24. Questions • Reproduce Strasbourg results • Investigate radiation tolerance and cross check with simulation • Study device properties in detail under various conditions • Operate in magnetic fields • Study power switching • Develop testbeam infrastructure (pixel telescope) • … MVD Meeting, 11/11/2003, Tobias Haas, DESY

  25. Some Example Activities • Topic 1: • Best possible VXD vs. What do we need to do the physics? • Topic 2: • Develop a sensor technology that does the job. • Topic 3: • How do we put sensors together to make a real detector? MVD Meeting, 11/11/2003, Tobias Haas, DESY

  26. MVD Meeting, 11/11/2003, Tobias Haas, DESY

  27. Contributions by J. Hauschild, B. Löhr, C. Muhl MVD Meeting, 11/11/2003, Tobias Haas, DESY

  28. MVD Meeting, 11/11/2003, Tobias Haas, DESY

  29. Outlook and Activities • Physics Studies: • Work on the list of identified reference processes • Contribute to the overall software effort • Push the detector technology • Build a pixel telescope • Contribute to the chip design • Workout viable overall detector schemes: • Mounting/support cooling MVD Meeting, 11/11/2003, Tobias Haas, DESY

  30. MVD Meeting, 11/11/2003, Tobias Haas, DESY

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