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<p>Friends,</p>
<p>Please find the minutes from this meeting <a
moz-do-not-send="true"
href="https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_August_25,_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, August 25, 2020, </span><span
class="mw-headline" id="Minutes">Minutes</span></h2>
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lang="en">
<p>Present: Alex Austregesilo, Sean Dobbs, Mark Ito
(chair), Naomi Jarvis, Richard Jones, Mahmoud Kamel,
Susan Schadmand, Simon Taylor, Nilanga Wickramaarachchi
</p>
<p>There is a <a rel="nofollow" class="external text"
href="https://bluejeans.com/s/uEubMV@QQm3/">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 the [[HDGeant4 Meeting, August 11,
2020#Minutes|minutes from August 11].
</p>
<ul>
<li> We have yet to follow up with Elton on <a
rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/HDGeant4/issues/167">Issue
#167</a> (G4 exceptions for certain run numbers).
Mark will contact him.</li>
<li> We are waiting for feedback from Colin on <a
rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/HDGeant4/issues/111">Issue
#111</a> (Difference in Acceptance between G3 and
G4).</li>
<li> On <a rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/HDGeant4/issues/173">Issue
#173</a> (Negative counts on eta invariant mass
spectrum for 2017 simulation), Mahmoud reported that
he has been working with Justin Stevens and they have
a solution. From Mahmoud's issue-closing message:</li>
</ul>
<blockquote>
<p>In my code I have double uniqueness tracking, one on
the missing mass, and the other on the final state
photons only, which is not a correct approach to use
with the accidental subtraction.
</p>
</blockquote>
<h3><span class="mw-headline" id="Possible_Future_Issues">Possible
Future Issues</span></h3>
<p>Sean remarked that there are some discrepancies
appearing in the studies from the Particle ID working
group when comparing data to Monte Carlo. At some point
these may be logged as HDGeant4 issues when they are
better understood.
</p>
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