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<p>Folks,</p>
<p>Please find the minutes <a moz-do-not-send="true"
href="https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_March_10,_2020#Minutes">here</a>
and below.</p>
<p> -- Mark</p>
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<h2 id="firstHeading" class="firstHeading" lang="en"><span
dir="auto">HDGeant4 Meeting, March 10, 2020, </span><span
class="mw-headline" id="Minutes">Minutes</span></h2>
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lang="en">
<p>Present:
</p>
<ul>
<li> <b> CMU: </b> Naomi Jarvis</li>
<li> <b> FSU: </b> Sean Dobbs</li>
<li> <b> JLab: </b> Alex Austregesilo, Colin Gleason,
Mark Ito (chair), Igal Jaegle, Richard Jones, Keigo
Mizutani, Justin Stevens, Simon Taylor, Beni Zihlmann</li>
</ul>
<p>There is a <a rel="nofollow" class="external text"
href="https://bluejeans.com/s/hNQX5/">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,_January_28,_2020#Minutes"
title="HDGeant4 Meeting, January 28, 2020">the minutes
from January 28</a>. There were no significant updates
from work presented at that meeting.
</p>
<h3><span class="mw-headline" id="Issues_on_GitHub">Issues
on GitHub</span></h3>
<p>We reviewed <a rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/HDGeant4/issues">the
Issues page</a>.
</p>
<ul>
<li> <a rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/HDGeant4/issues/145">SKIP
card is broken with sufficiently large numbers of
events #145</a>. This one was fixed by a change to
HDDM in the halld_recon repository. It can be closed.</li>
<li> <a rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/HDGeant4/issues/143">BCAL
reconstructed energy sometimes broken on startup:
multicore only #137</a>. Jon posted a control.in
that should allow Richard to reproduce the problem.</li>
<li> <a rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/HDGeant4/issues/137">K
particle gun request to resolve G3/G4 difference
near p 0.5 GeV/c and theta 120 degrees #137</a>.
Mark will ask Nilanga for further studies along the
lines described below.</li>
<li> <a rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/HDGeant4/issues/93">Calorimeter
timing mismatch between g3 and g4 #93</a> from Alex
and <a rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/HDGeant4/issues/111">Difference
in Acceptance between G3 and G4 #111</a> 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:
<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>
</li>
</ul>
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