GlueX Offline Meeting, July 25, 2012
GlueX Offline Software Meeting
Wednesday, July 25, 2012
1:30 pm EDT
JLab: CEBAF Center, F326/327
Agenda
- Announcements
- Data Challenge Meetings
- Scientific Computing Survey
- No more software sessions in Tracking Meetings (by default)
- Review of minutes from the last meeting: all
- Reconstruction sub-group reports
- Calorimeters
- Tracking
- PID
- Action Item Review
- Review of recent repository activity: all
Communication Information
Video Conferencing
- ESNet: 8542553
- EVO:
- Meeting URL: http://evo.caltech.edu/evoNext/koala.jnlp?meeting=e9eIeivev8aMaMIvaaI9
- Phone Bridge ID: 13 0949
Slides
Talks can be deposited in the directory /group/halld/www/halldweb1/html/talks/2012-3Q
on the JLab CUE. This directory is accessible from the web at https://halldweb1.jlab.org/talks/2012-3Q/ .
Minutes
Present:
- CMU: Will Levine, Curtis Meyer
- IU: Ryan Mitchell, Matt Shepherd
- JLab: Mark Ito (chair), Manuel Lara, David Lawrence, Paul Mattione, Elton Smith, Simon Taylor, Elliott Wolin, Beni Zihlmann
announcements
david and elliott translation tables, serious thoughts send them along, proposed format circulated
how to turn on output no more work known to be done
simon positive charged tracks: pi k p negative k- pi- by default
calorimeters • david, putting in realism in bcal smearing ∘ full electronic pulse shape, with dark hits ∘ hdgeant and mcsmear, disabled by preprocessor directives. it as the default, unsmeared file much larger ∘ mcsmear 4 times slower for single photons ∘ times of execution are comparable, hgdgeant vs mcsmear, 3 times longer for hdgeant ∘ pythia events, have been tried should be measured ∘ presentation at future meeting
tracking, Simon • rate of execution, one additional swim over references eliminated, • straight line fitting for alignment of the chambers • algorithm to adjust parameters of each wire plane • allow for rotation and shift of entire plane • reference article, using silicon strips • convergence problems, put in annealing procedure, scale errors, tighten them up • Eltons suggestion, omega events for 1200 vs 1500 A in solenoid, looks like drop in performance due to reduction in background • started lamda, p pi- events, no conclusions yet • 1200 - 1500 20% loss in delta p/p, missing mass only worse by a few percent
Paul, topics • middle of writing a kinematic fitters, 4-momentum conservation, time constraints, rf timing, vertext constraint • hit in bcal, propagate time back to vertex, uncertainty in the time, with energy loss, • 7 variables, p3, t, x, y, z, in covariance matrix • hope to have results in two weeks
Comment
• ubuntu 64 reconstruction does not work • •