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Physics Impact of Detector Performance

Physics Impact of Detector Performance. Tim Barklow SLAC March 18, 2005. Outline. General Considerations Vertex Detector Tracker Calorimeter Far forward detector Examples of parametric physics studies Calorimeter D E jet Tracker D p t Summary.

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Physics Impact of Detector Performance

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  1. Physics Impact of Detector Performance Tim Barklow SLAC March 18, 2005

  2. Outline • General Considerations • Vertex Detector • Tracker • Calorimeter • Far forward detector • Examples of parametric physics studies • Calorimeter DEjet • Tracker Dpt • Summary

  3. Classic application of b,c tagging to Higgs branching ratios. But there’s more: vertex charge top, W helicity asymmetries t tagging stau analyses Higgs tau BR b jets with several n’s Vertex Detector *Talk by Chris Damerell 21Mar2005

  4. Vertex Detector – tau tagging example

  5. Tracker • Momentum resolution set by recoil mass analysis of • reconstruction and long-lived new particles (GMSB SUSY) • Multiple scattering effects • Forward tracking • Measurement of Ecm, differential luminosity and polarization using physics events Recoil Mass (GeV)

  6. Separate hadronically decaying W’s from Z’s in reactions where kinematic fits won’t work: Help solve combinatoric problem in reactions with 4 or more jets Calorimeter sE/E = 0.6/ÖE sE/E = 0.3/ÖE

  7. Electron veto down to 3.2 mrad in presence of very large pair background Useful in general to suppress backround. Takes on added importance given that the SUSY parameter space consistent with Dark Matter density includes region with nearly degenerate Crossing angle implications. Far Forward Detector

  8. Far Forward Detector dM/Mstau (%) Rel. stau mass error increases from 0.14% to 0.22% with 20 mrad cross angle

  9. Reconstructed Mbb 4C Fitted Mbb Mbb (GeV) Mbb (GeV) Mbb (GeV) Mbb (GeV)

  10. Mbb (GeV) Mbb (GeV) Mbb (GeV) Mbb (GeV)

  11. Simdet Fast MC with this parameterization of pt resolution in place of Simdet’s emulation of LDC: SiD Detector Resolution p=3 GeV p=20 GeV p=100 GeV p=20 GeV, SIMDET LDC

  12. Recoil Mass (GeV) Recoil Mass (GeV) Recoil Mass (GeV) Recoil Mass (GeV)

  13. Recoil Mass (GeV) Recoil Mass (GeV) Recoil Mass (GeV) Recoil Mass (GeV)

  14. Fit for only Muon Energy (GeV) Muon Energy (GeV) Muon Energy (GeV) Muon Energy (GeV)

  15. Branching Ratio of H  CC * Talk by Haijun Yang in TRK session 20Mar2005  DBr/Br ~ 39% (120GeV), 64% (140GeV)for Zl+l-, 1000 fb-1

  16. Beam Energy Profiles Before Collision After Collision Lumi Weighted Ebeam (GeV) Ebeam (GeV) Ebeam (GeV) • Center of Mass Energy Error Requirements • Top mass: 200 ppm (35 Mev) • Higgs mass: 200 ppm (60 MeV for 120 GeV Higgs) • Giga-Z program: 50 ppm

  17. DEcm = 47 MeV * Talk by Klaus Moenig in MDI session 20Mar2005 Ecm (GeV)

  18. Ecm (GeV) Mmm (GeV)

  19. Ecm (GeV) Mmm (GeV)

  20. Ecm Resolution in MeV vs a or b DEmm vs a angles only DEZg vs b DEZg vs a DEmm vs b DEmm SIMDET LDC DEZg SIMDET LDC

  21. Ecm Resolution in MeV vs a or b angles only DEZg vs b DEmm vs b DEmm vs a DEZg vs a DEmm SIMDET LDC DEZg SIMDET LDC

  22. Simdet Fast MC with this parameterization of pt resolution in place of Simdet’s emulation of LDC: SiD Detector Resolution p=3 GeV p=20 GeV p=100 GeV p=20 GeV, SIMDET LDC

  23. Summary • Current detector designs appear well matched to envisioned physics program • Choices will have to be made as realitities of detector engineering and cost are confronted – physics benchmark studies will play a crucial role. The examples of parametric studies shown here are just the beginning.

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