Charged Particle PID May 2007

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Please edit this page! Write answers to the questions. Add more questions. Also please link any relevant technical document or talk to this page so we can use it as a resource during discussions.



Charged Particle PID Questions

  • What is needed to develop a simulation that accurately represents PID capability of GlueX?
    • response of detector elements must be realistic
    • reconstruction algorithms must exist for detectors (energy weighted mean time for BCAL, average time for TOF, etc.)
    • other contributing errors (path length, start time, etc.) must be realistic
  • How do we develop a standard to judge the performance of the GlueX PID system?
    • What are the key strange reactions?
    • What are the predicted cross sections with respect to non-strange backgrounds?


Milestones for the July Workshop


Cherenkov/RICH

Documentation/Talks/Links

  • status of Ckov studies (Eugene)

Discussion Points

  • What does Cherenkov or RICH provide?
  • Do we need kaon ID outside of forward region?
  • What is the impact of beam related backgrounds on these designs?


Full TOF (BCAL + TOF)

Documentation/Talks/Links

  • analysis of timing resolution in BCAL test beam data (Blake)
  • analysis of cosmic data (Christina)
  • summary of beam test results for TOF bars (Alex)

BCAL

TOF

Discussion Points

Detector Response

  • What input is needed to validate the detector response in the Monte Carlo?
  • What is the status of the beam test/cosmic analysis?

Reconstruction

  • What is the status of the reconstruction algorithm in the MC regarding timing?
  • How does the simulation model event start time?
  • Can the tracking package provide track lengths with realistic errors?
  • For each detector, what is the dominant contribution to the TOF resolution?


Tracking

Documentation/Talks/Links

  • status of dE/dx in simulation (Curtis)

Discussion Points

Detector Response

  • Is energy deposition in CDC cells appropriately modeled?
  • Is the response of the charge integrating electronics realistic, especially for forward tracks with large path lengths within a cell?
  • Is dE/dx even relevant for (higher momentum) forward tracks.

Reconstruction

  • Can the tracking package provide path length within a cell?
  • What is the status of an algorithm to convert dE/dx for cells on a track to a likelihood for a specific particle?


Global/Kinematic Fitting

Documentation/Talks/Links

  • division of labor among PID systems (Alex)
  • status of kinematic fitting package (Matt)

Discussion Points

  • How much does strangeness counting help global PID?
  • What is the procedure for combing information from various PID systems?
    • Do we want to combine into a single likelihood for a particular charged track?
    • Do we combine that likelihood with a χ2 quantity from a kinematic fit?
  • What detector level information needs to be made available in order to begin kinematic fitting?
    • uniform representation of kinematic data
    • accurate error matrices
    • realistic model of tagger precision