GlueX Start Counter Meeting, October 18, 2018

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GlueX Start Counter Meeting
Thursday, October 18, 2018
10:00 am EDT
CEBAF Center, Room F324-325
BlueJeans: 556 286 544


  1. Announcements
  2. Review minutes from the meeting on September 20
  3. Calibration and Efficiency
  4. NIM Paper
  5. Work Packages
  6. Action Item Review




Talks can be deposited in the directory /group/halld/www/halldweb/html/talks/2018 on the JLab CUE. This directory is accessible from the web at .



  • FIU: Werner Boeglin, Mahmoud Kamel
  • FSU: Sean Dobbs
  • JLab: Thomas Britton, Mark Ito (chair), Simon Taylor, Beni Zihlmann

There is a recording of this meeting on the BlueJeans site. Use your JLab credentials to authenticate.

Review minutes from the meeting on September 20

We went over the minutes. Regarding the simulations that Sean had announced last time, Mahmoud used them in his presentation at the last collaboration meeting in the section on comparison between data and Monte Carlo.

Calibration and Efficiency

Mahmoud has checked the start counter time resolution for run 50799 of the current run period. The resolution is nominal at around 300 ps.

Work Packages

We reviewed the PID section of the Work Packages wiki page.

  • As mentioned at the last TOF meeting, there still is a place for the detector working groups to develop raw quantities, such as timing information, that can be used to form higher level quantities used for particle identification.
  • There are issues remaining in this working group.
    • Sean: quantifying detector response as a function of location in phase space and capturing those measurements in the simulation and reconstruction.
    • Werner: transmission of Mahmoud's expertise in calibration and performance measurement to new students.
    • Geometrical alignment studies.
    • Refinement of comparisons between simulation and data.
  • Need for a new particle identification working group.
    • Effort is needed to formalize how we combine PID info from various detector systems on a collaboration-wide basis.
    • Mark: this effort could be folded into a work package of the software working group.
    • Thomas: when bringing new students into say π/K ID efficiency and fake rates, existing detector working groups not appropriate. The discussion there is much lower level.
    • Werner: there are three new grad students from FIU, candidates for getting plugged in
    • Sean: a dedicated meeting of a new group would be best to address this issue.
    • Werner: it would be best for a JLab person to convene a new working group. That provides centrality, collaboration-wise, and continuity.
    • Thomas and Mark will discuss working-group-convening responsibilities.

NIM Paper

Eric Pooser has produced a new draft incorporating comments from Beni and Elton Smith. This is good progress. Mark will distribute the draft to those who commented on the previous draft. This draft has been shortened; more edits are probably needed.