GlueX Offline Meeting, May 16, 2012

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GlueX Offline Software Meeting
Wednesday, May 16, 2012
1:30 pm EDT
JLab: CEBAF Center, F326/327


  1. Announcements
    1. Group disk quota increased, halld
    2. Request submitted to IT for mirror mysql server
  2. Review of minutes from the last meeting: all
  3. Collaboration meeting agenda
  4. Reconstruction sub-group reports
    1. Calorimeters: Photon Reconstruction in b1pi events 04/25/2012 (Will)
    2. Tracking: Spiral Track Update (Paul)
    3. PID
  5. Start Counter geometry changes: Simon
  6. Offline Software Review Planning
  7. Action Item Review
  8. Review of recent repository activity: all

Communication Information

Video Conferencing


Talks can be deposited in the directory /group/halld/www/halldweb1/html/talks/2012-2Q on the JLab CUE. This directory is accessible from the web at .



  • CMU: Will Levine, Paul Mattione, Curtis Meyer
  • IU: Matt Shepherd,
  • JLab: Mark Ito (chair), David Lawrence, Simon Taylor, Elliott Wolin, Beni Zihlmann


  • The halld group disk almost ran out of space yesterday. Some clean-up was done and the quota was increased from 105 GB to 125 GB. David asked about the cost of this form of disk storage. No one present could answer so he will look into it.
  • A formal request for a new MySQL server has been submitted to JLab IT. The new server will mirror the calibration database and will allow read-only connections from off the JLab site. Agreement for such a configuration was agreed to some months ago.
  • There will be a special session for upgrades at the Collaboration Meeting next week. Richard will present his work on Geant4 in that session.

Review of minutes from the last meeting

We reviewed the minutes from the ??? meeting.

  • On simulating sampling fluctuations in the BCAL, David reported that Elton Smith has summarized the discussion held when Andrei and Irina Semonov(a) were here. Work on this is planned for the summer.

Collaboration Meeting Agenda

The current schedule for the offline session:

Tuesday May 22, 2012
11:30 Session IIIc (75) --- Offline - Chair: R. Jones
   11:30 (25) --- Overview - Mark Ito
   11:55 (25) --- Tracking Update - Simon Taylor
   12:20 (25) --- Calorimetry - Will Levine

Reconstruction sub-group reports


Will gave a report on photon reconstruction in b1pi events. See his wiki page for details. He showed reconstruction studies for the BCAL and the FCAL for two cases:

  1. Standard full event reconstruction of b1pi events
  2. Individual photons and charged particles were selected kinematically from the b1pi generated events, but were simulated one photon (or pion, or proton) at a time.

In the full event sample, reconstructed "photons" has a contamination from pions at low energy, as seen by comparing to the distribution from one-at-a-time pions. He also showed distributions of other cluster properties that might help distinguish between charged particles and photons.


Tracking Code Improvements

Simon - low momentum protons, rare eta 350 MeV/c cut-ff seen improved - track recovery code kinks and borken tracks chi2 distributions improving

Paul M pi recon efficiency what about higher pt ideas being tested changes in hi prining my help

paul pid k cerenkov studies after collab meeting

target vessel dimensions have also changed lowest angle for start counter about 3 degrees

hdds version needed new release needed nightly seems ok

have a look at slides: david

written material needs to be put together: curtis