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Benchmark for Vertex/Tracker

Benchmark for Vertex/Tracker. 19 Mar. 2005 @LCWS2005 Y. Sugimoto KEK. Purpose of Benchmarks for Detector R&D. Step 1: See physics output (precision) as a function of detector performance Set detector performance goals Show the justification for detector R&D Quick simulation Step 2:

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Benchmark for Vertex/Tracker

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  1. Benchmark for Vertex/Tracker 19 Mar. 2005 @LCWS2005 Y. Sugimoto KEK

  2. Purpose of Benchmarks for Detector R&D • Step 1: • See physics output (precision) as a function of detector performance • Set detector performance goals • Show the justification for detector R&D • Quick simulation • Step 2: • Detector design optimization to achieve the performance goal • Full simulator • Step 3: • Show overall performance of the detector system • Full simulation/Quick simulation Step 1 Step 3 Step 2

  3. Michael Peskin’s List

  4. Preferable benchmark process • More demanding • More sensitive to det. performance • More direct (less analysis or other sub-detector dependent)

  5. Performances to be studied • Tracker • Momentum resolution : d(1/Pt) • Two-track separation  Loss of hits  d(1/Pt) • Particle ID (dE/dx) • V-particle / Kink-track reconstruction • Vertexing • Impact parameter resolution (b, c, t-tag efficiency) • Vertex charge measurement

  6. Momentum resolution • Legacy channel: e+ e-  ZH, Zm+m- • Requirement: Width of recoil mass peak should be determined by beam (dEb, beam strahlung, and ISR) • Just showing peaks is not very convincing • We should show the accuracies of measurements(MH, branching ratio, etc.)as a function of detector performance (by A. Miyamoto)

  7. Momentum resolution • Higgs rare decay (?) e+ e-  ZH, Hm+m- • Br(H m+m-)~3x10-4 • O(10) events with L=500 fb-1 • The peak above background may be seen with excellent tracker ? m (from GLC report)

  8. H  mm • Simulation with JLC-I det. (d(1/Pt)=1x10-4) • No more background process? (by K.Fujii)

  9. Momentum resolution • Smuon pair • Smuon and LSP masses are determined from the end points of muon momenta • The accuracy of masses are determined by momentum resolution of the tracker • Tim Barklow’s presentation showed dm has no dependence on tracker performance??? (from GLC report)

  10. V-particle/kink reconstruction • GMSB: • Slepton (NLSP) can be long lived and decay in the tracker volume • Kinked track(s) observed • dE/dx measurement helps slepton (low b) ID • Too exotic? • How to parameterize the performance?

  11. Impact parameter resolution • e+ e-  ZH (Higgs branching measurement) • Flavor tagging is usually depends on analysis (and other sub-detectors) • Comparison between different values of detector parameters should be done within a same analysis • Any other benchmark more direct ?

  12. Vertex Charge • Chargino pair production • To identify W-charge and get differential cross section of chargino pair production, vertex charge (D+/D-) has to be determined • To identify D0 or D0-bar, particle ID by dE/dx is important to tag K+/K- • W/Z separation requires good jet energy resolution (PFA) ~ c10 ~ c20 ~ W+ Z c1+ ~ W- Z c1- ~ c20 ~ c10 + t-channel diagram

  13. Chargino pair production • Simulation with JLC-I det. (Jet E res.=40%/E1/2) Preliminary (by K. Fujii)

  14. Summary • Candidates for benchmark processes for tracker/vertex in step1 PFA  

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