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<p>Folks,</p>
<p>Find the notes below and by clicking <a moz-do-not-send="true"
href="https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_August_14,_2018#Notes">here</a>.</p>
<p> -- Mark</p>
<p>_______________________________</p>
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<h1 id="firstHeading" class="firstHeading" lang="en"><span
dir="auto">Notes, HDGeant4 Meeting, August 14, 2018</span></h1>
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lang="en">
<p>Present: <br>
</p>
<ul>
<li> <b> FSU: </b> Sean Dobbs</li>
<li> <b> JLab: </b> Thomas Britton, Mark Ito (chair),
Justin Stevens, Simon Taylor, Beni Zihlmann</li>
<li> <b> UConn: </b> Richard Jones</li>
</ul>
<p>There is a <a rel="nofollow" class="external text"
href="https://bluejeans.com/s/dHzpO/">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_20,_2018#Notes"
title="HDGeant4 Meeting, July 20, 2018">Notes</a>
were reviewed.</li>
</ul>
<h3><span class="mw-headline" id="Announcement">Announcement</span></h3>
<p><b><a rel="nofollow" class="external text"
href="https://mailman.jlab.org/pipermail/halld-offline/2018-August/003324.html">New
HDGeant4 tagged release</a></b>. This one has
Richard's FDC fixes.
</p>
<h3><span class="mw-headline"
id="Comparison_post_FDC_fix.28es.29">Comparison post
FDC fix(es)</span></h3>
<p>Thomas showed distribution after fixing. See page 17 of
the files posted <a rel="nofollow" class="external
text"
href="https://halldweb.jlab.org/gluex_sim/G3G4_Comparisons/FDCFix/">here</a>.
</p>
<ul>
<li> First attempt at comparison had problems with wrong
tagged version of HDGeant4 and a mis-set
JANA_CALIB_CONTEXT.</li>
<li> Protons at 4 GeV/c at 15 degrees polar angle look
much, much better.</li>
<li> Still a problem with protons at 4 GeV/c at 4
degrees.
<ul>
<li> FOM distributions on page 23 and 24 are very
different.</li>
<li> Will repeat turning off mult. scattering,
energy loss fluctuations, position resolution
smearing.
<ul>
<li> [added in press] the control file for this
comparison can be found at <a rel="nofollow"
class="external text"
href="https://halldweb.jlab.org/gluex_sim/G3G4_Comparisons/Gcontrol_pure.in">Gcontrol_pure.in</a>.</li>
</ul>
</li>
<li> Time-to-distance relation (TTDR) between Monte
Carlo (MC) and MC reconstruction not consistent.</li>
<li> Simon will look at using same TTDR as used for
data in both MC and MC reconstruction.</li>
</ul>
</li>
</ul>
<h3><span class="mw-headline" id="Issues">Issues</span></h3>
<p>We reviewed the <a rel="nofollow" class="external
text"
href="https://github.com/JeffersonLab/HDGeant4/issues">issues
on GitHub</a>.
</p>
<ul>
<li> Geometric overlaps still on the list.</li>
<li> Thomas will mark the FDC issue resolved and/or
start a new FDC issue as appropriate.</li>
</ul>
<h3><span class="mw-headline"
id="Next_Generation_of_Signal_MC">Next Generation of
Signal MC</span></h3>
<p>We will wait for further study of FDC issue and
adoption of consistent TTDR before starting a new round
of Signal MC.
</p>
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<pre class="moz-signature" cols="72">--
Mark Ito, <a class="moz-txt-link-abbreviated" href="mailto:marki@jlab.org">marki@jlab.org</a>, (757)269-5295
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