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Detector Design and Alignment

  • re-optimisation of inner silicon tracker design:

    • objective: The efficiency to find secondary vertices in forward direction is limited in current ILD design, e.g. due to relatively large gap between end of VTX barrel and first FTD disk,
                         which is in turn related to the Faraday cage of the VTX and services in this area. Eg CLICdp takes a completely different approach with its "spiraling" forward vertex detector.
                         Could a CLICdp-like approach also improve ILD? Are there other ideas for better - and yet realistic layouts of VTX /FTD? Are there any benefits from making SIT part of
                        the vertex detector?

    • tools & methodology: DD4HEP, start from ILD_l5_v02, modify VTX/FTD transition, and/or try to plug-in CLICdp vertex detector. Compare resolutions and efficiencies / purities to ILD_l5_v02, both at track-level and at vertex-level

    • contact: Roman Poeschl, Marcel Vos

  • incorporation of fast timing into ILD:

    • objective: With time resolutions at the level of a few 10ps becoming conceivable, a proposal should be made if and how fast timing could be implemented in ILD. Possible usecases
                         reach  from rejection of out-of-time backgrounds via 5D Particle Flow to particle identification (ToF).

    • tools & methodology: current ILD simulation and reconstruction provides hits from the SET and the first 10 layers of the ECal with "perfect" timing and smeared by various assumed
                                              time resolutions. Based on these, formulate requirements for the various use cases, and estimate potential benefit, discuss these requirements with the relevant
                                              sub-detector groups, formulate proposal of how to implement timing in ILD and what R&D would be needed.

    • contact: Jenny List

  • tracker alignment:

    • objective: estimate need of tracks to align tracking system eg after push-pull,  determine achievable level of precision and residual systematics for standard running scenario, quantify amount of data eg at Z pole to significantly improve residual systematic uncertainties. How many cosmics would reach the deep ILC IP location?

    • tools & methodology: Mis-align tracker components in simulation (is supported by DD4HEP) and evaluate impact of various types / sizes of mis-alignments.
                                              Develop strategy for track-based alignment. Quantify residual uncertainties as a function of the available luminosity at each energy.
    • contact: Graham Wilson, Frank Gaede

Reconstruction and Performance

  • Systematic uncertainties:

    • objective: So far most physics projections are based on either rather ad-hoc assumptions on systematics or even on statistical uncertainties only. For a precision machine like the ILC,
                         however, maximizing the control of systematic effects and thereby minimizing their impact on the final physics output should be integral part of the detector (and accelerator)
                         design

    • tools & methodology: 
    • contact: Graham Wilson, Marcel Vos, Jenny List

  • Reconstruction of V0s, kinks & prongs:

    • objective: 

    • tools & methodology: 
    • contact: Graham Wilson, Jenny List

  • Particle Flow improvement: fragment classification

    • objective: 

    • tools & methodology: 
    • contact: Graham Wilson, Jenny List

  • Photon Reconstruction:

    • objective: 

    • tools & methodology: 
    • contact: Graham Wilson

  • Jet clustering with PFO uncertainties:

    • objective: 

    • tools & methodology: 
    • contact: Marcel Vos, Jenny List

Open Topics wrt Physics Potential

  • Triple Gauge Couplings at 250 GeV:

    • objective: 

    • tools & methodology: 
    • contact: Jenny List
  • Dark Sector Discovery Potential at 250 GeV:

    • objective: 

    • tools & methodology: 
    • contact: Mikael Berggren, Tomohiko Tanabe
  • Higgs self-coupling at 500-600 GeV:

    • objective: 

    • tools & methodology: 
    • contact: Jenny List, Junping Tian
  • Top Yukawa Coupling at 500-600 GeV:

    • objective: 

    • tools & methodology: 
    • contact: Tomohiko Tanabe, Junping Tian
  • Higgs self-coupling at 1 TeV:

    • objective: 

    • tools & methodology: 
    • contact: Jenny List, Junping Tian