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<p>Simulators,</p>
<p>Please find the minutes <a moz-do-not-send="true"
href="https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_March_24,_2020#Minutes">here</a>
and below.</p>
<p> -- Mark</p>
<p>
</p>
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<h2 id="firstHeading" class="firstHeading" lang="en"><span
dir="auto">HDGeant4 Meeting, March 24, 2020, </span><span
class="mw-headline" id="Minutes">Minutes</span></h2>
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lang="en">
<p>Present: Sean Dobbs, Colin Gleason, Mark Ito (chair),
Igal Jaegle, Naomi Jarvis, Richard Jones, Justin
Stevens, Simon Taylor
</p>
<p>There is a <a rel="nofollow" class="external text"
href="https://bluejeans.com/s/AYXCC/">recording of
this meeting</a> on the BlueJeans site. Use your JLab
credentials to get access.
</p>
<h3><span class="mw-headline"
id="Review_of_minutes_from_the_last_Meeting">Review of
minutes from the last Meeting</span></h3>
<p>We went over <a
href="https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_March_10,_2020#Minutes"
title="HDGeant4 Meeting, March 10, 2020">the minutes
from March 10</a>. 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:
</p>
<ol>
<li> Richard will do particle studies to understand the
differences between G3 and G4, especially for charged
hadrons in the BCAL.</li>
<li> 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.</li>
</ol>
<p>There was no progress to report, but we agreed that
these are still things that we want to pursue.
</p>
<h3><span class="mw-headline" id="Issues_on_GitHub">Issues
on GitHub</span></h3>
<p>We went over some of <a rel="nofollow" class="external
text"
href="https://github.com/JeffersonLab/HDGeant4/issues">the
issues</a>.
</p>
<p>Igal lead us through <a rel="nofollow" class="external
text"
href="https://github.com/JeffersonLab/HDGeant4/issues/146">Issue
146, Discrepancy in the gamma gamma invariant mass
distribution between Geant3 and Geant4</a>. He had
noticed differences between π<sup>0</sup> peak position
in γγ invariant mass distributions between G3 and G4.
The issue turns out to be related to <a rel="nofollow"
class="external text"
href="https://github.com/JeffersonLab/HDGeant4/issues/113">Issue
113, Overall BCAL energy shift?</a> 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 <a rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/HDGeant4/pull/147">#147</a> and <a
rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/HDGeant4/pull/148">#148</a>)
and now Igal's plots are in good agreement,
G3-versus-G4-wise.
</p>
<p>Igal closed both Issues 113 and 146.
</p>
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