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<p>People,</p>
<p>Please find the minutes below and by clicking <a
moz-do-not-send="true"
href="https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_August_28,_2018#Minutes">here</a>.</p>
<p> -- Mark</p>
<p>_____________</p>
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<h2 id="firstHeading" class="firstHeading" lang="en"><span
dir="auto">Minutes, HDGeant4 Meeting, August 28, 2018</span></h2>
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lang="en">
<p>Present:
</p>
<ul>
<li> <b> FSU: </b> Sean Dobbs</li>
<li> <b> JLab: </b> Thomas Britton, Mark Ito (chair),
Simon Taylor, Beni Zihlmann</li>
<li> <b> UConn: </b> Richard Jones</li>
<li> <b> W&M: </b> Justin Stevens</li>
</ul>
<p>There is a <a rel="nofollow" class="external text"
href="https://bluejeans.com/s/IGvQ6/">recording of
this meeting</a> on the BlueJeans site. Use your JLab
credentials.
</p>
<h3><span class="mw-headline" id="Announcement">Announcement</span></h3>
<p>Thomas reported a bug in mcsmear that has recently been
identified and fixed. See <a rel="nofollow"
class="external text"
href="https://github.com/JeffersonLab/halld_sim/pull/9">Pull
Request #9 for halld_sim</a>. The BCAL smearing
parameters were being used uninitialized. That resulted
in random behavior, e. g., varying widths in energy
resolution from run to run of the mcsmear executable.
Recent simulations generated for comparison between HDG3
and HDG4 may have the disease.
</p>
<h3><span class="mw-headline"
id="Review_of_notes_from_last_time">Review of notes
from last time</span></h3>
<p>We went over <a
href="https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_August_14,_2018#Notes"
title="HDGeant4 Meeting, August 14, 2018">the notes</a>.
</p>
<ul>
<li> The JANA_CALIB_CONTEXT-not-set warning that was
recently added appears to be warning whether
JANA_CALIB_CONTEXT is set or not.</li>
<li> The change in the treatment of the time-to-distance
relation discussed last time has been implemented on a
branch of halld_sim. Thomas and Simon are testing it.
Once it has been merged to the master, Richard will
have to re-implement the scheme in HDG4.</li>
</ul>
<h3><span class="mw-headline" id="Issues_on_GitHub">Issues
on GitHub</span></h3>
<p>We reviewed the <a rel="nofollow" class="external
text"
href="https://github.com/JeffersonLab/HDGeant4/issues">list
of issues</a>. Justin entered <a rel="nofollow"
class="external text"
href="https://github.com/JeffersonLab/HDGeant4/issues/65">a
new one</a> last Friday where optical photons have
inconsistent propagation distance vs. propagation time
depending on whether or not they cross certain material
boundaries. Richard will be looking into this one.
</p>
<h3><span class="mw-headline"
id="pi0.2Feta_-.3E_2g_masses">pi0/eta -> 2g masses</span></h3>
<p>Sean <a rel="nofollow" class="external text"
href="https://halldweb.jlab.org/wiki/images/2/29/Sdobbs_HDG4_082818.pdf">showed
plots</a> showing a slight shift (5 MeV) in the
location of the two photon invariant mass for neutral
pions and eta's when comparing HDG3 with HDG4. The
origin is unclear at present.
</p>
<p>We agreed that, in principle, problems like these
should not be solved by smearing parameters in mcsmear
that depend on whether the simulated data is generated
by HDG3 or by HDG4.
</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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