GlueX Offline Meeting, September 7, 2011
GlueX Offline Software Meeting
Wednesday, September 7, 2011
1:30 pm EDT
JLab: CEBAF Center F326
Contents
Agenda
- Announcements
- Review of minutes from the last meeting: all
- Compressed Data Format Update (Richard or Igor)
- BCAL Reconstruction Update (Will)
- Reconstruction chi-squared/uncertainty update: Paul Mattione.
- Discussion of Reconstruction Tasks and Topics for Further Development
- Software work day at the Collaboration Meeting?
- Other items
- Recently Resolved
- Outstanding Items
- Review of recent repository activity: all
Communication Information
Telephone
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Video Conferencing
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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 (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 minutes from the August ??? 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.
Reconstruction chi-squared/uncertainty update
Curtis posted a [??? document on the DocDB] from PANDA, describing the scheme for their central tracking
Paul presented a ??? 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.
simon: chisq problems, track finding stage, could be improved forward direction number of candidates with wrong charge hypothesis, chisq of fit is bad mark: may be a marker, not a cause
Will, BCAL, doing ok for single photon events, moving toward 1234 segmentation, work in progress
1234 can be changed easily, matt, calibration may not be correct, geometry file to change segmentation
Paul, item 5, wiki page • uncertainties on bcal fcal tof • single photon, pion events • compare reconstructed vs generated
need convention for time reported for all detectors, inner radious, front face
tracking simon pid paul photon matt
brainstorm
many more reconstructed
0 - 10.5 degrees
big overshoot at downstream end of bcal Beni's b1pi wiki page
number of protons, reconstruction efficiency seems very low compared to pi + at angle of 30 see same amount of protons and pions
will thinks taht the problem was not as bad a few months ago
new segmentation for the bcal
overall reconstruction in b1pi
cause of complete failure of track fitting and finding
particle id timing shift in time of flight timing shift in fcal
paul will present a design for how tof beni present hermes scheme
mark will add items to list conveners will organize the list
New Action Items
- Write requirements for digitizing Monte Carlo data for online testine. -> Elliott