[Halld-offline] Offline Software Meeting Minutes, July 25, 2012

[Mark M. Ito]

Folks,

Find the minutes below and at

https://halldweb1.jlab.org/wiki/index.php/GlueX_Offline_Meeting,_July_25,_2012#Minutes

-- Mark
_____

GlueX Offline Meeting, July 25, 2012
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

* Data Challenge Meetings have started on alternate Mondays at 1:30
pm.
* Mark urged us to participate in the [28]Scientific Computing
Survey.
* There will be no more (default) software sessions as part of the
bi-weekly Tracking Meeting.
* David and Elliott have started work on translation tables. If you
have thoughts send them along. A proposed format was circulated on
the Offline email list.

Review of Minutes from Previous Meetings

Offline Meeting

We reviewed the [29]minutes from the July 11th meeting.
* Paul reported that he thinks all work has been done for now on the
REST format. We can start using it in production.
* Simon made the promised changes in the default track hypotheses
generated:
+ Positive tracks: pi, K, p
+ Negative tracks: pi, K

Data Challenge Meeting

We looked at the [30]minutes of the July 16th meeting without
significant comment.

Reconstruction Sub-Group Reports

Calorimeters

David has been working on putting more realism in the BCAL smearing.
* Full electronic pulse shape are generated, with dark hits.
* Changes have been made to hdgeant and mcsmear. They are currently
disabled by pre-processor directives.
* The unsmeared file is much larger; mcsmear is four times slower for
single photon events
* hdgeant is about three times slower than mcsmear previously.
* David will give a presentation on this work at a future meeting.

Tracking

Simon gave a report:
* One final, additional swim over reference trajectory eliminated.
* The straight line fitting for alignment of the chambers is working.
+ Working with an algorithm to adjust parameters of each wire
plane.
+ Allows for rotation and shift of entire plane.
+ Some convergence difficulties being worked on presently.
* Looking at omega events to compare perfomance at 1200 A vs. 1500 A
in the solenoid.
+ Looks like there is a drop in performance due to reduction in
background.
+ Started work on lambda to p pi- events, no conclusions yet.
+ In comparison of 1200/1500 A, see a 20% loss in Δp/p, but
missing mass only worse by a few percent.

PID

Paul gave a report:
* He is in the middle of writing a kinematic fitter. Will incorporate
4-momentum conservation, time constraints, RF timing, vertex
constraints
* Using 7 variables in the covariance matrix: px, py, pz, t, x, y,
and z.
* Hopes to have results in two weeks.

Ubuntu

Beni reports that he is having problems building a working copy of the
GlueX software on an Ubuntu 64-bit system.

Review of Action Items and Repository Activity

* Dmitry Romanov is scheduled to arrive back at JLab in early August.
* We noted that Richard checked in a solution the the problem
initially reported by David where hddm-xml was running out of
buffer space.

Retrieved from
"https://halldweb1.jlab.org/wiki/index.php/GlueX_Offline_Meeting,_July_25,_2012"

References

28. 
https://halldweb1.jlab.org/wiki/index.php/Private:Scientific_Computing_Survey,_2012
29. 
https://halldweb1.jlab.org/wiki/index.php/GlueX_Offline_Meeting,_July_11,_2012#Minutes
30. 
https://halldweb1.jlab.org/wiki/index.php/GlueX_Data_Challenge_Meeting,_July_16,_2012#Minutes

-- 
Mark M. Ito
Jefferson Lab (www.jlab.org)
(757)269-5295