[Halld-offline] Minutes, GlueX Offline Software Meeting, November 16, 2011

[Mark M. Ito]

Peeps,

Find the minutes at 
https://halldweb1.jlab.org/wiki/index.php/GlueX_Offline_Meeting,_November_16,_2011 
and as text below.

-- Mark
_____

GlueX Offline Meeting, November 16, 2011

Minutes

Present:
* CMU: Will Levine, Paul Mattione, Curtis Meyer
* FSU: Nathan Sparks
* IU: Ryan Mitchell, Matt Shepherd
* JLab: Mark Ito (chair), David Lawrence, Dmitry Romanov, Simon
Taylor, Elliott Wolin

Reconstruction sub-group reports

Calorimeters

Matt gave the report.
* Will has checked in changes to BCAL code
* When there is a demonstration of improvement with the new code
versus the legacy KLOE code, the new code will be made the default.

Tracking

Simon and Will gave reports.

Simon reminded us that problems have been reported with the proton
reconstruction efficiency in b[1]π events. A couple of rounds of
improvements have been tried, with modest gains. Work on this
continues.

In the light of recent improvements, Will has started looking at
reconstruction efficiency and kinematic fitting for
all-charged-final-state events. See [34]his wiki page for details. He
is seeing relatively high reconstruction efficiency, but not so good
efficiency for passing a confidence level cut. Several people suggested
restructuring the study to separate the effects of reconstruction and
those of the calculation of errors.

PID

Paul gave the report.

Paul has been doing studies of dE/dx in the tracking chambers. Recall
that this component of particle identification has been dropped in the
current version on the trunk. See [36]his wiki page for details. He
showed plots of dE/dx separately for the CDC and FDC, both means and
sigma's for pions up to 9 GeV.
* Matt pointed out that the action for us in the region below about 1
GeV where these quantities are varying rapidly. He suggested that
Paul concentrate his efforts there.
* There is a difference between the dE/dx in the CDC versus that in
the FDC. Mark thought that it would be interesting to see if it
could be accounted for by the different gas mixtures set in the
Monte Carlo for the two systems.
* Paul intends to run more statistics to fill out the variety of
cases he has studied.

CCDB Beta Release Report

Dmitry [38]released a beta version of the calibration and conditions
database (CCDB) last week. In the subsequent testing, some
surprises/anomalies in the use of the file-based calibration system
were discovered. See his slides for details. The CCDB is a bit more
formal than the file-based system, and there was consensus that
adjustments to code and files will be done to make things more
consistent.

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References

34. 
https://halldweb1.jlab.org/wiki/index.php/Kinematic_fitting_charged_particles_11/16/11
36. https://halldweb1.jlab.org/wiki/index.php/Mattione_Update_11162011
38. 
https://mailman.jlab.org/pipermail/halld-offline/2011-November/000787.html