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SGV and ZVTOP

On November 15, 2003, Tobias Haas, alongside V. Adler and P. Luzniak, presented critical findings regarding the optimization of VXD design parameters at DESY's MVD meeting. The discussion centered on identifying key parameters for efficient sensor configurations, power distribution, and technology-specific considerations, including MAPS, CCD, and DEPFET. The session highlighted a two-step approach using SGV for quick explorative configurations, followed by high-precision verification. Initial results showed strong agreement with BRAHMS data, indicating the value of the B-tagging analysis tool for detector optimization studies.

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SGV and ZVTOP

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  1. SGV and ZVTOP Simulation Session, 15 Nov. 03 Tobias Haas (with V. Adler and P. Luzniak) DESY/F1

  2. 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

  3. 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

  4. 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

  5. Ties Behnke Integration of Simulation/Reconstruction/Analysis LCIO Physics Generator Detector Tracker Digitizer Reconstructor Analyser SGV Geometry/Conditions MVD Meeting, 11/11/2003, Tobias Haas, DESY

  6. … while waiting … • 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

  7. 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

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

  9. Initial Results (shown in Amsterdam by V. Adler) MVD Meeting, 11/11/2003, Tobias Haas, DESY

  10. Results 1 MVD Meeting, 11/11/2003, Tobias Haas, DESY

  11. Results 2 MVD Meeting, 11/11/2003, Tobias Haas, DESY

  12. Remarks • Generally, there is good agreement between BRAHMS and SGV … • … but still small discrepancies. • Possible reasons: • SGV precision is limited: • Only cylindrical/planar geometries • B-tagging NN may have to be retrained • However, may still go ahead and use this for analysis • H branching fractions in e+e-→ ZH→ qqXY(by P. Luzniak) MVD Meeting, 11/11/2003, Tobias Haas, DESY

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

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

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

  16. 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

  17. Summary • A first important analysis tool (B-tagging à la ZVTOP) is now available with SGV. • Results have been carefully cross checked with full simulation/standard analysis in BRAHMS. • Has been submitted to M. Berggren (author of SGV) to be available as a general facility. • First results on Higgs branching fractions show the usefulness of the tool. • e.g. Full power of vertex detector (5 very thin layers) does not matter for B tagging but important for charm. MVD Meeting, 11/11/2003, Tobias Haas, DESY

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