[Halld-offline] Minutes, GlueX Offline Software Meeting, September 7, 2001

[Mark M. Ito]

Folks,

Find the minutes at 
http://www.jlab.org/Hall-D/software/wiki/index.php/GlueX_Offline_Meeting%2C_September_7%2C_2011#Minutes 
and as text below.

   -- Mark
  _____

GlueX Offline Meeting, September 7, 2011

Minutes

    Present:
      * CMU: Will Levine, Paul Mattione, Curtis Meyer
      * IU: Ryan Mitchell, Kei Moriya, Matt Shepherd (chair)
      * JLab: Mark Ito, David Lawrence, Dmitry Romanov, Simon Taylor,
        Elliott Wolin, Beni Zihlmann
      * UConn: Igor Senderovich


Announcements

    Elliott issued a head-up for the need for creating digitized data for
    online testing from Monte Carlo events. He will write-up requirements
    for this.

Review of minutes from the last meeting

    We skimmed the [35]minutes from the August 24 meeting.

    Mark reminded us that we still need a solution for putting large
    magnetic field maps into the CCDB.

Compressed Data Format Update

    Igor reported that Richard is working on the code based on feedback
    received at the last meeting.

BCAL Reconstruction Update

    Will reported that the BCAL seems to do well for single photon events.
    He is also starting to look at implementing the new 1-2-3-4
    segmentation for the read-out.

    Matt mentioned that the read-out change should be easy, modulo
    calibration. There is a header file that defines the geometry.

Reconstruction chi-squared/uncertainty update

    Curtis posted a [39]document on the DocDB from PANDA, describing the
    scheme for their central tracking

    Simon reported a pattern with some tracks with chi-squared problems. In
    the forward direction problems are correlated with track finding
    producing candidates with the wrong charge hypothesis.

    Paul presented a [40]wiki page summarizing work to study reported
    errors from the FCAL, BCAL, and TOF. He decided to focus on these
    detectors since others are working on tracking errors. Some of his
    observations:
      * There an energy-dependent offset between simulated and
        reconstructed times in the FCAL of about 2 ns.
      * The observed FCAL energy resolution is about 50-60% greater than
        the value from the function that reports errors in the
        reconstruction.
      * The TOF also shows a small offset, about 150 ps, in reconstructed
        time.

    See his page for details.

    We agreed on a convention for reported times from reconstruction, the
    time when the particle crosses the inner surface of the detector. Some
    of the time offsets may be due to the correction used for doing this.

Brainstorming Reconstruction Issues

    Other discussion items not described above.
      * Beni: many more reconstructed photons than the number generated.
        Details on his [42]b1pi analysis wiki page.
      * Beni: reconstruction efficiency seems very low for protons. Again
        see his wiki page.
           + Will thinks that the problem was not as bad a few months ago.
      * Simon/Mark: In general, track down major causes of complete failure
        of track fitting and finding in both single-particle and
        multi-particle events.
      * Paul will present a design for how TOF information should be used.
        [?]
      * Beni will present HERMES particle ID scheme.
      * Mark will add new items to list on the [43]Reconstruction Tasks and
        Topics for Further Development page.

    Matt proposed that we have standing agenda items at the Physics and
    Offline meetings with conveners reporting on progress in three major
    areas:
      * Tracking: Simon
      * PID: Paul
      * Photons: Matt

    They will get together and organize the list from the wiki page and
    assign priorities.

New Action Items

      * Write requirements for digitizing Monte Carlo data for online
        testing. -> Elliott
      * Paul will present a design for how TOF information should be used.
      * Beni will present HERMES particle ID scheme.
      * Mark will add new items to list on the [45]Reconstruction Tasks and
        Topics for Further Development page.
      * Conveners with organize the list.

    Retrieved from
    
"http://www.jlab.org/Hall-D/software/wiki/index.php/GlueX_Offline_Meeting%2C_September_7%2C_2011"

References

   35. 
http://www.jlab.org/Hall-D/software/wiki/index.php/GlueX_Offline_Meeting%2C_August_24%2C_2011#Minutes
   39. 
http://argus.phys.uregina.ca/cgi-bin/private/DocDB/ShowDocument?docid=1802
   40. 
http://www.jlab.org/Hall-D/software/wiki/index.php/Mattione_Update_09072011
   42. 
http://www.jlab.org/Hall-D/software/wiki/index.php/B1pi_tests_Sep._2011
   43. 
http://www.jlab.org/Hall-D/software/wiki/index.php/Reconstruction_Tasks_and_Topics_for_Further_Development
   45. 
http://www.jlab.org/Hall-D/software/wiki/index.php/Reconstruction_Tasks_and_Topics_for_Further_Development