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<p>Colleagues,</p>
<p>Please find the minutes <a moz-do-not-send="true"
href="https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_September_22,_2020#Minutes">here</a>
and below.</p>
<p> -- Mark</p>
<p>___________________________________________</p>
<p>
</p>
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<h2 id="firstHeading" class="firstHeading" lang="en"><span
dir="auto">HDGeant4 Meeting, September 22, 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, Simon Taylor
</p>
<p>There is a <a rel="nofollow" class="external text"
href="https://bluejeans.com/s/YHFnU7y3RT6/">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,_August_25,_2020#Minutes"
title="HDGeant4 Meeting, August 25, 2020">the minutes
from August 25</a>.
</p>
<h4><span class="mw-headline"
id="PID_matching_suggestions_based_on_data.2FMC_comparisons">PID
matching suggestions based on data/MC comparisons</span></h4>
<p>Sean gave a <a rel="nofollow" class="external text"
href="https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=4652">presentation</a>,
previewed at last week's Software Meeting, on data vs.
Monte Carlo comparisons beyond those discussed at
previous HDGeant4 Meetings. These are related to PID
issues and are all present in the context of analysis of
specific exclusive events topologies.
</p>
<p>The areas identified, illustrated with plots in the
main body of the talk, are summarized in his first
slide, reproduced below.
</p>
<div class="thumb tright">
<div class="thumbinner" style="width:302px;"><a
href="https://halldweb.jlab.org/wiki/index.php/File:Sdobbs_pid_20200908.png"
class="image"><img alt="Sdobbs pid 20200908.png"
src="https://halldweb.jlab.org/wiki/images/thumb/9/9d/Sdobbs_pid_20200908.png/300px-Sdobbs_pid_20200908.png"
class="thumbimage" width="300" height="225"></a> </div>
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<p>There was a lot of discussion on each of the three
issues listed. For each of the particles highlighted
within the reactions, an analysis was done isolate the
efficiency of the particle in question, thus differences
in efficiency reported in the slide are single particle
efficiencies. The secretary will refer interested
parties to the recording for details.
</p>
<ol>
<li> Widen FCAL γ Δt cut
<ul>
<li> Mahmoud Kamel's analysis, starts at 7:25</li>
</ul>
</li>
<li> Widen TOF Δt cuts
<ul>
<li> Colin Gleason's analysis, starts at 20:46</li>
<li> Ahmed Foda's analysis, starts at 30:03</li>
</ul>
</li>
<li> Investigate widening BCAL Δt cuts
<ul>
<li> Peter Pauli's analysis, starts at 33:03</li>
<li> Nilanga Wickramaarachchi's analysis, starts at
40:07</li>
</ul>
</li>
</ol>
<p>Beyond his slides, Sean mentioned a couple of other
areas that likely contribute to disagreements between
data and Monte Carlo.
</p>
<ol>
<li> Cuts on the χ<sup>2</sup> of kinematic fits.</li>
<li> Cuts on the total missing mass squared in the
reaction.</li>
</ol>
<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</a>.
</p>
<ul>
<li> We will ask Igal if Issue #177 (Run number is
changing to 10000 for whatever run used) can be
closed.</li>
<li> We will ask Elton if Issue #167 (G4 exceptions for
certain run number)</li>
<li> On Issue #111 (Difference in Acceptance between G3
and G4), Richard has an undergraduate student at UConn
working on it.</li>
</ul>
<h3><span class="mw-headline" id="Action_Item_Review">Action
Item Review</span></h3>
<ul>
<li> Close Issue #177</li>
<li> Close Issue #16</li>
<li> Upgrade version of Geant4
<ul>
<li> We need a upgraded compiler to upgrade the
Geant4 version. To this end, Mark has made
progress on the CentOS 8 build. He gets a complete
green field build of our software in a singularity
container (also build from scratch) without any
by-hand operations.</li>
</ul>
</li>
</ul>
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