GlueX Offline Meeting, June 1, 2011

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GlueX Offline Software Meeting
Wednesday, May 18, 2011
1:30 pm EDT
JLab: CEBAF Center A110

Agenda

  1. Announcements
  2. Review of minutes from the last meeting: all
  3. DFCALPhoton vs. DFCALShower: Mihajlo
  4. b1pi fix: David, Paul
  5. Kinematic fitting in GlueX: Kei
  6. Re-cap of review, IT in the 12 GeV Era: Mark
  7. Grid Make System: Richard
  8. Action Item Review: all
  9. Review of recent repository activity: all

Communication Information

Telephone

To connect by telephone:

  1. dial:
  2. enter access code followed by the # sign: 3421244#

Video Conferencing

Slides

Talks can be deposited in the directory /group/halld/www/halldweb1/html/talks/2011-2Q on the JLab CUE. This directory is accessible from the web at https://halldweb1.jlab.org/talks/2011-2Q/ . You have to be a member of the "halld" Unix group to do this.

Minutes

Present:

  • UConn: Alex Barnes, Richard Jones
  • IU: Mihajlo Kornicer, Kei Moriya
  • JLab: Hovanes Egiyan, Mark Ito (chair), David Lawrence, Paul Mattione, Yi Qiang, Ivan Tolstukhin, Elliott Wolin, Beni Zihlmann

Announcements

At Elliott's urging, Ivan announced that Dmitry Romanov will return to JLab mid-June, and plans to stay for six months. Ivan himself will be leaving mid-July.

DFCALPhoton vs. DFCALShower

Mihajlo and David explained the situation.

  • There is an inconsistency in the naming convention between the FCAL and the BCAL.
  • Mihajlo will work on bringing them into registration.
  • The hierarchy is
    1. detector hit
    2. cluster
    3. shower
    4. particle
  • A shower does not become a particle until associated with a vertex. The photon has a full three-momentum. Before that the shower only contains local coordinate information.
  • Mihajlo proposed that the algorithm to merge showers should be applied after matching showers with charged tracks and not before matching. David and Mihajlo will discuss this offline and report to the group.

propose to make this change.

paul missing a whole bucnh of particles fixes were done to the vertex factory photons were 0 momentum and energy improved if not fixed re-ran b1pi analysis last stable build was getting 5% reconstructed high mass tail to unphysical values new, was not there 3 mos ago pi0 now wider than before

vertex factory, where particles are grouped, charged and photons, cut hard-wired at 3 sigma, time and z, things were grouped into different vertices, several

vertex structure, class, member of dvertex, hold shower, inherits from dkinematic data, pointers to cluster objects, reconstructed info, not copied into dkinematic data part. info now copied into dkinematic data infinitely large cut, 100 sigma, a configuration parameter veryy good bulshitters


New Action Items

  • Decide on cluster merging after or before charged track matching.
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