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<p>Please find the minutes for the meeting held earlier this week <a
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href="https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_December_17,_2019#Minutes">here</a>
and below.</p>
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<h2 id="firstHeading" class="firstHeading" lang="en"><span
dir="auto">HDGeant4 Meeting, December 17, 2019, </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> JLab: </b> Alex Austregesilo, Mark Dalton,
Colin Gleason, Mark Ito (chair), Keigo Mizutani, Simon
Taylor</li>
<li> <b> UConn: </b> Richard Jones</li>
</ul>
<p>There is a <a rel="nofollow" class="external text"
href="https://bluejeans.com/s/Eum3E/">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_December_3_Meeting">Review
of Minutes from the December 3 Meeting</span></h3>
<p>We went over <a
href="https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_December_3,_2019#Minutes"
title="HDGeant4 Meeting, December 3, 2019">the minutes</a>.
Alex will close <a rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/HDGeant4/issues/125">the issue on
neutron generation</a>.
</p>
<h3><span class="mw-headline" id="genBH_Output_Format">genBH
Output Format</span></h3>
<p>At the last software meeting Mark D. reported problems
reading the output from the genBH generator. The code is
in the HDGeant4 repository. Richard was able to
reproduce the problem and submitted <a rel="nofollow"
class="external text"
href="https://github.com/JeffersonLab/HDGeant4/pull/135">a
pull request</a> that fixes the problem.
</p>
<h3><span class="mw-headline" id="Issues_on_GitHub">Issues
on GitHub</span></h3>
<p>We went over <a rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/HDGeant4/issues">the
issues</a>. Most of the time was spent discussion <a
rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/HDGeant4/issues/111">Issue
#111</a>, "Difference in Acceptance between G3 and
G4". Colin led the discussion.
</p>
<ul>
<li> Colin went back and revisited his study from last
May with recent versions of software.</li>
<li> When looking at the comparison of efficiency as a
function of eta-pi mass, the agreement is between G3
and G4 is reasonable, but when viewed as a function of
cosθ<sub>GJ</sub> there is a noticeable difference
between the forward and backward directions (at 7:17
in the recording). This is similar to the results of
the original study and the initial cause of concern.
Colin noted that the data is more similar to the G3
efficiency as opposed to that for G4.</li>
<li> Mark Dalton pointed out that in this and other
efficiency studies, the overall event acceptance is
less that that one would expect from single particle
studies.</li>
<li> After sorting through some some confusion, we
concluded that the single particle yield comparisons
that were shown are actually after the events are
accepted by the analysis library. This means that they
reflect not only the efficiency of the particle shown,
but the overall event efficiency. In particular
differences in the efficiencies for one type of
particle will effect the apparent comparative yield of
other particle types.</li>
<li> Alex suggested that the problematic effect might
also the the effect of timing cuts placed on charged
particles in the calorimeters, a problem he
illustrated in his post to <a rel="nofollow"
class="external text"
href="https://github.com/JeffersonLab/HDGeant4/issues/93">Issue
#93</a>. Colin will pursue this possibility, in
particular repeating the analysis with looser timing
cuts on matching between charged tracks and
calorimeter clusters.</li>
<li> Eugene Chudakov made a suggestion to Colin: do the
G3 vs. G4 comparison with the same input events and
see where the differences occur on an event-by-event
basis. Perhaps a pattern will emerge.</li>
</ul>
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