[Halld-offline] Offline Software Meeting Minutes, November 12, 2014

[Mark Ito]

Folks,

Please find the minutes below and at

https://halldweb1.jlab.org/wiki/index.php/GlueX_Offline_Meeting,_November_12,_2014 
.

   -- Mark
______________________________________________________________


GlueX Offline Meeting, November 12, 2014
Minutes

Present:

  * *CMU*: Curtis Meyer
  * *FSU*: Aristeidis Tsaris
  * *IU*: Matt Shepherd
  * *JLab*: Alex Barnes, Mark Ito (chair), David Lawrence, Paul
    Mattione, Kei Moriya, Eric Pooser, Mike Staib, Simon Taylor
  * *NU*: Sean Dobbs
  * *ODU*: Moskov Amaryan


Light Meson Decays in CLAS

Moskov presented a list of topics that could be addressed with GlueX 
along with an impressive set of plots that show the signals seen in the 
CLAS detector. See his slides 
<https://halldweb1.jlab.org/talks/2014-4Q/Amaryan_GLUEX.pdf> for 
details. You can also view a video of his talk 
<https://halldweb1.jlab.org/talks/2014-4Q/Amaryan_Light_Mesons.mpeg>.

Commissioning Simulations

Sean made several points:

  * Rate estimates were presented at the last calibration meeting.
  * With inconsistent beam it is hard to make comparisons with what we
    are seeing.
  * Simon will look into moving the start counter around to see if the
    known tilt is responsible for the up/down asymmetry in rates.
  * We discussed issues around putting in known effects due to non-ideal
    geometry both in simulation and in reconstruction. There are a lot
    of issues on how to handle it; different solutions may be
    appropriate for different types of non-idealism. For the start
    counter rates you need the geometry changed in HDDS. For small
    displacements in relative detector positions, it may be enough to
    put it into the reconstruction and ignore it in Monte Carlo. Matt
    wondered whether the different pieces of the detector could be
    assembled with parameters to match the as-built geometry.
  * The code is ready to go, but we will wait a few days before
    proceeding. The geometry may be changing rapidly over the next few
    days and we need to let that settle down.
  * Energy threshold is a big driver of simulated rates, but we have
    incomplete information on what those thresholds are.


Offline Data Monitoring

Paul let the discussion.

  * The online monitoring is not working at the moment, but Kei has been
    running the online monitoring offline and results are available on
    the monitoring website.
  * Matt asked about re-running monitoring analysis on old data with
    improved code as it comes out. We settled on doing a re-run of the
    entire data set once a week. The amount of data so far is small
    enough that that is not a problem.
  * Justin asked for feedback on the plots and time-lines available on
    the site. If there are things missing or requests for new items,
    please let him know.
  * Kei showed some results
    <https://halldweb1.jlab.org/wiki/images/2/20/2014-11-12-timing.pdf>
    of the monitoring histograms he has been producing as well as a few
    plots on analysis he has done on his own. In particular he showed a
    nice correlation between start counter times and FCAL times as
    measured with the FADCs. He sees a time difference distribution with
    a 2.6 ns sigma. Unfortunately we ran out of time and were not able
    to look at all of his slides, so those interested should take a look
    at the link given just above.

Retrieved from 
"https://halldweb1.jlab.org/wiki/index.php/GlueX_Offline_Meeting,_November_12,_2014"

-- 
Mark M. Ito, Jefferson Lab, marki at jlab.org, (757)269-5295

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