[Halld-offline] HDGeant4 Meeting Minutes, March 10, 2020

[Mark Ito]

Folks,

Please find the minutes here 
<https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_March_10,_2020#Minutes> 
and below.

   -- Mark


    HDGeant4 Meeting, March 10, 2020, Minutes

Present:

  * *CMU: * Naomi Jarvis
  * *FSU: * Sean Dobbs
  * *JLab: * Alex Austregesilo, Colin Gleason, Mark Ito (chair), Igal
    Jaegle, Richard Jones, Keigo Mizutani, Justin Stevens, Simon Taylor,
    Beni Zihlmann

There is a recording of this meeting <https://bluejeans.com/s/hNQX5/> on 
the BlueJeans site. Use your JLab credentials to get access.


      Review of minutes from the last Meeting

We went over the minutes from January 28 
<https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_January_28,_2020#Minutes>. 
There were no significant updates from work presented at that meeting.


      Issues on GitHub

We reviewed the Issues page 
<https://github.com/JeffersonLab/HDGeant4/issues>.

  * SKIP card is broken with sufficiently large numbers of events #145
    <https://github.com/JeffersonLab/HDGeant4/issues/145>. This one was
    fixed by a change to HDDM in the halld_recon repository. It can be
    closed.
  * BCAL reconstructed energy sometimes broken on startup: multicore
    only #137 <https://github.com/JeffersonLab/HDGeant4/issues/143>. Jon
    posted a control.in that should allow Richard to reproduce the problem.
  * K particle gun request to resolve G3/G4 difference near p 0.5 GeV/c
    and theta 120 degrees #137
    <https://github.com/JeffersonLab/HDGeant4/issues/137>. Mark will ask
    Nilanga for further studies along the lines described below.
  * Calorimeter timing mismatch between g3 and g4 #93
    <https://github.com/JeffersonLab/HDGeant4/issues/93> from Alex and
    Difference in Acceptance between G3 and G4 #111
    <https://github.com/JeffersonLab/HDGeant4/issues/111> from Colin.
    These issues have dominated discussion in recent meetings. We agreed
    that they need to addressed. Justin reminded is that they both show
    differences between simulation (G3 and/or G4) and data. We discussed
    two approaches:
     1. Richard will do particle studies to understand the differences
        between G3 and G4, especially for charged hadrons in the BCAL.
     2. Alex and Colin will try to isolate single particles in their
        exclusive events and look at calorimeter timing response for
        hadrons. Hopefully this can be done without tight cuts on the
        particle of interest. Also they will try to simulate the same
        reactions and repeat the studies with both G3 and G4. We will
        ask Nilanga to do a similar study with his backward kaons.

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