[Halld-offline] HDGeant4 Meeting Minutes, March 24, 2010

[Mark Ito]

Simulators,

Please find the minutes here 
<https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_March_24,_2020#Minutes> 
and below.

   -- Mark


    HDGeant4 Meeting, March 24, 2020, Minutes

Present: Sean Dobbs, Colin Gleason, Mark Ito (chair), Igal Jaegle, Naomi 
Jarvis, Richard Jones, Justin Stevens, Simon Taylor

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


      Review of minutes from the last Meeting

We went over the minutes from March 10 
<https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_March_10,_2020#Minutes>. 
We focused on the long-standing issue with timing from calorimeter for 
charged hadrons, in particular the two types of studies we agreed on, to 
repeat:

 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.

There was no progress to report, but we agreed that these are still 
things that we want to pursue.


      Issues on GitHub

We went over some of the issues 
<https://github.com/JeffersonLab/HDGeant4/issues>.

Igal lead us through Issue 146, Discrepancy in the gamma gamma invariant 
mass distribution between Geant3 and Geant4 
<https://github.com/JeffersonLab/HDGeant4/issues/146>. He had noticed 
differences between π^0 peak position in γγ invariant mass distributions 
between G3 and G4. The issue turns out to be related to Issue 113, 
Overall BCAL energy shift? 
<https://github.com/JeffersonLab/HDGeant4/issues/113> that Mark Dalton 
opened back in June of last year. Richard adjusted the hard-coded energy 
re-scale factors for BCAL and FCAL (Pull requests #147 
<https://github.com/JeffersonLab/HDGeant4/pull/147> and #148 
<https://github.com/JeffersonLab/HDGeant4/pull/148>) and now Igal's 
plots are in good agreement, G3-versus-G4-wise.

Igal closed both Issues 113 and 146.

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