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<p>Folks,</p>
<p>Find the notes below and <a moz-do-not-send="true"
href="https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_July_20,_2018#Notes">here</a>.</p>
<p> -- Mark</p>
<p>________________</p>
<p>
</p>
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<h1 id="firstHeading" class="firstHeading" lang="en"><span
dir="auto">HDGeant4 Meeting Notes, July 20, 2018</span></h1>
<div id="bodyContent" class="mw-body-content">Present:
<div id="mw-content-text" dir="ltr" class="mw-content-ltr"
lang="en">
<ul>
<li> <b> FSU: </b> Sean Dobbs</li>
<li> <b> JLab: </b> Alex Austregesilo, Thomas Britton,
Mark Ito (chair), Justin Stevens, Simon Taylor, Beni
Zihlmann</li>
<li> <b> Regina: </b> Zisis Papandreou</li>
<li> <b> UConn: </b> Richard Jones</li>
</ul>
<p>There is a <a rel="nofollow" class="external text"
href="https://bluejeans.com/s/PCm4D/">recording of
this meeting</a> on the BlueJeans site. Use your JLab
credentials.
</p>
<h3><span class="mw-headline"
id="Review_of_notes_from_last_time">Review of notes
from last time</span></h3>
<ul>
<li> <a
href="https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_July_6,_2018#Notes"
title="HDGeant4 Meeting, July 6, 2018">Notes</a>
were reviewed</li>
</ul>
<h3><span class="mw-headline"
id="Review_of_first_round_of_simulation_results">Review
of first round of simulation results</span></h3>
<ul>
<li> Thomas showed <a rel="nofollow" class="external
text"
href="https://halldweb.jlab.org/gluex_sim/G3G4_Comparisons/ver01/">list
of plots</a>.
<ul>
<li> <a rel="nofollow" class="external text"
href="https://mailman.jlab.org/pipermail/halld-offline/2018-July/003259.html">email
announcement of plots</a></li>
</ul>
</li>
<li> Much time spent discussion of one plot:</li>
</ul>
<p><a
href="https://halldweb.jlab.org/wiki/index.php/File:Prot_4_15_Hist_Reconstruction.png"
class="image"><img alt="Prot 4 15 Hist
Reconstruction.png"
src="https://halldweb.jlab.org/wiki/images/9/9f/Prot_4_15_Hist_Reconstruction.png"
height="628" width="800"></a>
</p>
<ul>
<li> Sean: geometry could be the cause</li>
<li> Richard: would like help isolating problem to
simulation or to reconstruction
<ul>
<li> Thomas will put together a plug-in to explore</li>
</ul>
</li>
<li> Thomas: both FDC and CDC hits are missing</li>
<li> question: are truth hits along real track
trajectory
<ul>
<li> can be explored with event viewer</li>
<li> Beni volunteers</li>
</ul>
</li>
<li> This is an <a rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/HDGeant4/issues/54">issue on
GitHub</a></li>
</ul>
<h3><span class="mw-headline" id="Other_Issues">Other
Issues</span></h3>
<ul>
<li> Maria Patsyuk <a rel="nofollow" class="external
text"
href="https://groups.google.com/forum/#%21topic/gluex-software/VOnAjfCf3r4">reported
overlaps in the geometry</a>
<ul>
<li> Richard will work on this</li>
</ul>
</li>
<li> Richard: issues with roll-your-own event generators
<ul>
<li> interaction z and t are correlated by machine
bunch structure</li>
<li> decay of long-lived particles can lead to
double counting (parent and daughter particles
both appear in final state)</li>
<li> [added in press] Richard wrote <a
rel="nofollow" class="external text"
href="https://halldweb.jlab.org/wiki/index.php/Guide_to_Monte_Carlo_event_timing_and_detached_vertices_in_HDGeant/4">new
wiki page describing best practices</a>.
<ul>
<li> There is a <a rel="nofollow"
class="external text"
href="https://github.com/JeffersonLab/HDGeant4/issues/55">related
issue on GitHub</a></li>
</ul>
</li>
</ul>
</li>
<li> Sean added an additional plot on the <a
rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/HDGeant4/issues/10">time
shift in FCAL showers issue</a>. He sees a
difference in hit times vs. shower times.</li>
</ul>
<h3><span class="mw-headline" id="Meeting_Time">Meeting
Time</span></h3>
<p>No one objects to meeting on Tuesdays at 2 pm, every
other week.
</p>
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