Revision as of 17:43, 21 September 2011

GlueX Offline Software Meeting
Wednesday, September 21, 2011
1:30 pm EDT
JLab: CEBAF Center F326

Agenda

1. Announcements
2. Review of minutes from the last meeting: all
3. Reconstruction sub-group reports
   1. Calorimeters: Matt
   2. Tracking: Simon
   3. PID: Paul M.: GlueX Particle ID, Uncertainties Update
4. Compressed Data Format Update: Richard or Igor
5. BCAL Reconstruction Update: Will
6. Plug-in to extract single particles from multi-particle events (email) : David
7. Tracking explained: Simon
8. Resources: an idea for managing large files: Dmitry
9. Collaboration Meeting Agenda
10. Action Item Review
    • Recently Resolved
    • Outstanding Items
11. Review of recent repository activity: all

Communication Information

Telephone

To connect by telephone:

1. dial:
   • US and Canada: (866)740-1260 (toll free)
   • International: (303)248-0285 (toll call) or look up toll-free number at http://www.readytalk.com/intl
2. enter access code followed by the # sign: 3421244#

Video Conferencing

• ESNet: 8542553
• EVO:
  • Meeting URL: http://evo.caltech.edu/evoNext/koala.jnlp?meeting=292I2iMeMB929nDs9aD9
  • Phone Bridge ID: 10 1789

Slides

Talks can be deposited in the directory /group/halld/www/halldweb1/html/talks/2011-3Q on the JLab CUE. This directory is accessible from the web at https://halldweb1.jlab.org/talks/2011-3Q/ . You have to be a member of the "halld" Unix group to do this.

Minutes

Present:

• CMU: Will Levine, Paul Mattione, Curtis Meyer
• IU: Ryan Mitchell, Kei Moriya, Matt Shepherd
• JLab: Hovanes Egiyan, Mark Ito (chair), David Lawrence, Yi Qiang, Dmitry Romanov, Elton Smith, Sascha Somov, Simon Taylor, Elliott Wolin
• Regina: Andrei Semenov
• FSU: Nathan Sparks

Announcements

• Mark announced that, by default, we will not be using the phone anymore at these meetings. I someone does happen to have a need for a phone connection, just let Mark know in advance.
• Elliott announced that he and David will be attending the CLAS12 Service Oriented Architecture Workshop. Contact Elliott for more information.

Reconstruction sub-group reports

Calorimetry

Matt gave the report.

• switch from 3-3-4 segmentation to 1-2-3-4 segmentation
  • geometry specification not as flexible as originally thought
  • Will is working on it
• timing offsets
  • talking to Mihajlo: time is set by time of highest energy block
  • x,y,z is not taken into account
  • will take some work and attention: Matt will work on this

Tracking

Simon gave the report.

• some problems have to do with the quality of track candidates
  • found issues with starting angle guess for very forward going tracks
  • fixed up angle in track candidate
• some other minor changes
• farming out fiducial cut study a possible issue
  • note: design goal for forward direction: down to one degree

PID

Paul gave the report.

• revised PID scheme: see his slides
  • original slides presented at last Physics meeting
  • changes based on feedback received on email list
  • referred us to the slides for details
• Beni: HERMES scheme used log of prob ratios
  • Beni will send around description of the scheme
• idea: instead of adding chi-squared's, try to weight chi-squared from different sources
  • the way to do that is not clear
  • errors may be correlated
  • motivation: what if a single hit on a track if spurious: isn't that an out-sized effect on the sum of chi-squared's?
  • some skepticism expressed about validity of this concern

variable thresholds in code now. not how it will be done david

Andrei: segmentation scheme, not agree, reconstrcution code effects energy resolution. if noise added or hits missed calibration will bias means

bother updating kloe: kloe default is still used in the fine segmentation scheme keep to kloe alive, keep for now

david

single particle plugin if two particles, two events are made

simon